Fernando Catalani

Universidade de São Paulo

H-index: 30

Latin America-Brazil

About Fernando Catalani

Fernando Catalani, With an exceptional h-index of 30 and a recent h-index of 28 (since 2020), a distinguished researcher at Universidade de São Paulo, specializes in the field of astroparticles physics.

His recent articles reflect a diverse array of research interests and contributions to the field:

Constraining models for the origin of ultra-high-energy cosmic rays with a novel combined analysis of arrival directions, spectrum, and composition data measured at the Pierre …

Radio measurements of the depth of air-shower maximum at the Pierre Auger Observatory

Testing hadronic-model predictions of depth of maximum of air-shower profiles and ground-particle signals using hybrid data of the Pierre Auger Observatory

Impact of the Magnetic Horizon on the Interpretation of the Pierre Auger Observatory Spectrum and Composition Data

Ground observations of a space laser for the assessment of its in-orbit performance

Demonstrating Agreement between Radio and Fluorescence Measurements of the Depth of Maximum of Extensive Air Showers at the Pierre Auger Observatory

An update on the arrival direction studies made with data from the Pierre Auger Observatory

Chasing Gravitational Waves with the Chereknov Telescope Array

Fernando Catalani Information

University	Universidade de São Paulo
Position	Escola de Engenharia de Lorena -
Citations(all)	7383
Citations(since 2020)	6344
Cited By	3299
hIndex(all)	30
hIndex(since 2020)	28
i10Index(all)	63
i10Index(since 2020)	56
Email	Access Email
University Profile Page	Universidade de São Paulo

Fernando Catalani Skills & Research Interests

astroparticles physics

Top articles of Fernando Catalani

Constraining models for the origin of ultra-high-energy cosmic rays with a novel combined analysis of arrival directions, spectrum, and composition data measured at the Pierre …

Authors

A Abdul Halim,Pedro Abreu,Marco Aglietta,Ingomar Allekotte,K Almeida Cheminant,Alejandro Almela,Roberto Aloisio,Jaime Alvarez-Muñiz,J Ammerman Yebra,Gioacchino Alex Anastasi,Luis Anchordoqui,Belén Andrada,Sofia Andringa,Carla Aramo,PR Araújo Ferreira,Enrico Arnone,JC Arteaga Velázquez,H Asorey,Pedro Assis,Gualberto Avila,Emanuele Avocone,Alina Mihaela Badescu,Alena Bakalova,Alexandru Balaceanu,Felicia Barbato,A Bartz Mocellin,Jose A Bellido,Corinne Berat,Mario Edoardo Bertaina,Gopal Bhatta,Marta Bianciotto,PL Biermann,Virginia Binet,Kathrin Bismark,Teresa Bister,Jonathan Biteau,Jiri Blazek,Carla Bleve,Johannes Blümer,Martina Boháčová,Denise Boncioli,Carla Bonifazi,L Bonneau Arbeletche,Nataliia Borodai,Jeffrey Brack,PG Brichetto Orchera,Florian Lukas Briechle,Antonio Bueno,Stijn Buitink,Mario Buscemi,Max Büsken,Anthony Bwembya,Karen S Caballero-Mora,Lorenzo Caccianiga,Ioana Caracas,Rossella Caruso,Antonella Castellina,Fernando Catalani,Gabriella Cataldi,Lorenzo Cazon,Marcos Cerda,Jose Augusto Chinellato,Jiri Chudoba,Ladislav Chytka,Roger W Clay,AC Cobos Cerutti,Roberta Colalillo,Alan Coleman,Maria Rita Coluccia,Ruben Conceição,Antonio Condorelli,Giovanni Consolati,Matteo Conte,Fabio Convenga,D Correia dos Santos,Pedro J Costa,CE Covault,Markus Cristinziani,CS Cruz Sanchez,Sergio Dasso,Kai Daumiller,Bruce R Dawson,Rogerio M de Almeida,Joaquín de Jesús,Sijbrand J de Jong,JRT de Mello Neto,Ivan De Mitri,Jaime de Oliveira,Danelise de Oliveira Franco,Francesco de Palma,Vitor de Souza,Emanuele De Vito,Antonino Del Popolo,Olivier Deligny,Luca Deval,Armando Di Matteo,Madalina Dobre,Carola Dobrigkeit,Juan Carlos d'Olivo,LM Domingues Mendes,JC dos Anjos,RC dos Anjos,Jan Ebr,Fiona Ellwanger,Mohamed Emam,Ralph Engel,Italo Epicoco,Martin Erdmann,Alberto Etchegoyen,Carmelo Evoli,Heino Falcke,John Farmer,Glennys Farrar,AC Fauth,Norberto Fazzini,Fridtjof Feldbusch,Francesco Fenu,Alexandra Fernandes,Brian Fick,Juan Manuel Figueira,Andrej Filipčič,Thomas Fitoussi,Benjamin Flaggs,Tomas Fodran,Toshihiro Fujii,Alan Fuster,Cristina Galea,Claudio Galelli,Beatriz García,Chloé Gaudu,Hartmut Gemmeke,Flavia Gesualdi,Alexandru Gherghel-Lascu,Piera Luisa Ghia,Ugo Giaccari,Marco Giammarchi,Jonas Glombitza,Fabian Gobbi,Fernando Gollan,Geraldina Golup,M Gómez Berisso,PF Gómez Vitale,Juan Pablo Gongora,Juan Manuel González,Nicolás González,Isabel Goos,Dariusz Góra,Alessio Gorgi,Marvin Gottowik,Trent D Grubb

Journal

Journal of Cosmology and Astroparticle Physics

Published Date

2024/1/11

The combined fit of the measured energy spectrum and shower maximum depth distributions of ultra-high-energy cosmic rays is known to constrain the parameters of astrophysical models with homogeneous source distributions. Studies of the distribution of the cosmic-ray arrival directions show a better agreement with models in which a fraction of the flux is non-isotropic and associated with the nearby radio galaxy Centaurus A or with catalogs such as that of starburst galaxies. Here, we present a novel combination of both analyses by a simultaneous fit of arrival directions, energy spectrum, and composition data measured at the Pierre Auger Observatory. The model takes into account a rigidity-dependent magnetic field blurring and an energy-dependent evolution of the catalog contribution shaped by interactions during propagation.We find that a model containing a flux contribution from the starburst galaxy …

Radio measurements of the depth of air-shower maximum at the Pierre Auger Observatory

Authors

A Abdul Halim,P Abreu,M Aglietta,I Allekotte,K Almeida Cheminant,A Almela,R Aloisio,J Alvarez-Muñiz,J Ammerman Yebra,GA Anastasi,L Anchordoqui,B Andrada,S Andringa,L Apollonio,C Aramo,PR Araújo Ferreira,E Arnone,JC Arteaga Velázquez,P Assis,G Avila,E Avocone,A Bakalova,F Barbato,A Bartz Mocellin,JA Bellido,C Berat,ME Bertaina,G Bhatta,M Bianciotto,PL Biermann,V Binet,K Bismark,T Bister,J Biteau,J Blazek,C Bleve,J Blümer,M Boháčová,D Boncioli,C Bonifazi,L Bonneau Arbeletche,N Borodai,J Brack,PG Brichetto Orchera,FL Briechle,A Bueno,S Buitink,M Buscemi,M Büsken,A Bwembya,KS Caballero-Mora,S Cabana-Freire,L Caccianiga,R Caruso,A Castellina,F Catalani,G Cataldi,L Cazon,M Cerda,A Cermenati,JA Chinellato,J Chudoba,L Chytka,RW Clay,AC Cobos Cerutti,R Colalillo,A Coleman,MR Coluccia,R Conceição,A Condorelli,G Consolati,M Conte,F Convenga,D Correia dos Santos,PJ Costa,CE Covault,M Cristinziani,CS Cruz Sanchez,S Dasso,K Daumiller,BR Dawson,RM de Almeida,J de Jesús,SJ de Jong,JRT de Mello Neto,I De Mitri,J de Oliveira,D de Oliveira Franco,F de Palma,V de Souza,BP de Souza de Errico,E De Vito,A Del Popolo,O Deligny,N Denner,L Deval,A di Matteo,M Dobre,C Dobrigkeit,JC D’Olivo,LM Domingues Mendes,Q Dorosti,JC dos Anjos,RC dos Anjos,J Ebr,F Ellwanger,M Emam,R Engel,I Epicoco,M Erdmann,A Etchegoyen,C Evoli,H Falcke,J Farmer,G Farrar,AC Fauth,N Fazzini,F Feldbusch,F Fenu,A Fernandes,B Fick,JM Figueira,A Filipčič,T Fitoussi,B Flaggs,T Fodran,T Fujii,A Fuster,C Galea,C Galelli,B García,C Gaudu,H Gemmeke,F Gesualdi,A Gherghel-Lascu,PL Ghia,U Giaccari,J Glombitza,F Gobbi,F Gollan,G Golup,M Gómez Berisso,PF Gómez Vitale,JP Gongora,JM González,N González,I Goos,D Góra,A Gorgi,M Gottowik

Journal

Physical Review D

Published Date

2024/1/8

The Auger Engineering Radio Array (AERA), part of the Pierre Auger Observatory, is currently the largest array of radio antenna stations deployed for the detection of cosmic rays, spanning an area of 17 km 2 with 153 radio stations. It detects the radio emission of extensive air showers produced by cosmic rays in the 30–80 MHz band. Here, we report the AERA measurements of the depth of the shower maximum (X max), a probe for mass composition, at cosmic-ray energies between 10 17.5 and 10 18.8 eV, which show agreement with earlier measurements with the fluorescence technique at the Pierre Auger Observatory. We show advancements in the method for radio X max reconstruction by comparison to dedicated sets of corsika/coreas air-shower simulations, including steps of reconstruction-bias identification and correction, which is of particular importance for irregular or sparse radio arrays. Using the …

Testing hadronic-model predictions of depth of maximum of air-shower profiles and ground-particle signals using hybrid data of the Pierre Auger Observatory

Authors

A Abdul Halim,P Abreu,M Aglietta,I Allekotte,K Almeida Cheminant,A Almela,R Aloisio,J Alvarez-Muñiz,J Ammerman Yebra,GA Anastasi,L Anchordoqui,B Andrada,S Andringa,L Apollonio,C Aramo,PR Araújo Ferreira,E Arnone,JC Arteaga Velázquez,P Assis,G Avila,E Avocone,A Bakalova,F Barbato,A Bartz Mocellin,JA Bellido,C Berat,ME Bertaina,G Bhatta,M Bianciotto,PL Biermann,V Binet,K Bismark,T Bister,J Biteau,J Blazek,C Bleve,J Blümer,M Boháčová,D Boncioli,C Bonifazi,L Bonneau Arbeletche,N Borodai,J Brack,PG Brichetto Orchera,FL Briechle,A Bueno,S Buitink,M Buscemi,M Büsken,A Bwembya,KS Caballero-Mora,S Cabana-Freire,L Caccianiga,F Campuzano,R Caruso,A Castellina,F Catalani,G Cataldi,L Cazon,M Cerda,A Cermenati,JA Chinellato,J Chudoba,L Chytka,RW Clay,AC Cobos Cerutti,R Colalillo,MR Coluccia,R Conceição,A Condorelli,G Consolati,M Conte,F Convenga,D Correia dos Santos,PJ Costa,CE Covault,M Cristinziani,CS Cruz Sanchez,S Dasso,K Daumiller,BR Dawson,RM de Almeida,J de Jesús,SJ de Jong,JRT de Mello Neto,I de Mitri,J de Oliveira,D de Oliveira Franco,F de Palma,V de Souza,BP de Souza de Errico,E de Vito,A del Popolo,O Deligny,N Denner,L Deval,A Di Matteo,M Dobre,C Dobrigkeit,JC d'Olivo,LM Domingues Mendes,Q Dorosti,JC dos Anjos,RC dos Anjos,J Ebr,F Ellwanger,M Emam,R Engel,I Epicoco,M Erdmann,A Etchegoyen,C Evoli,H Falcke,G Farrar,AC Fauth,N Fazzini,F Feldbusch,F Fenu,A Fernandes,B Fick,JM Figueira,A Filipčič,T Fitoussi,B Flaggs,T Fodran,T Fujii,A Fuster,C Galea,C Galelli,B García,C Gaudu,H Gemmeke,F Gesualdi,A Gherghel-Lascu,PL Ghia,U Giaccari,J Glombitza,F Gobbi,F Gollan,G Golup,M Gómez Berisso,PF Gómez Vitale,JP Gongora,JM González,N González,D Góra,A Gorgi,M Gottowik,TD Grubb,F Guarino

Published Date

2024/1/30

We test the predictions of hadronic interaction models regarding the depth of maximum of air-shower profiles, , and ground-particle signals in water-Cherenkov detectors at 1000 m from the shower core, , using the data from the fluorescence and surface detectors of the Pierre Auger Observatory. The test consists in fitting the measured two-dimensional (, ) distributions using templates for simulated air showers produced with hadronic interaction models EPOS-LHC, QGSJet II-04, Sibyll 2.3d and leaving the scales of predicted and the signals from hadronic component at ground as free fit parameters. The method relies on the assumption that the mass composition remains the same at all zenith angles, while the longitudinal shower development and attenuation of ground signal depend on the mass composition in a correlated way. The analysis was applied to 2239 events detected by both the fluorescence and surface detectors of the Pierre Auger Observatory with energies between to eV and zenith angles below . We found, that within the assumptions of the method, the best description of the data is achieved if the predictions of the hadronic interaction models are shifted to deeper values and larger hadronic signals at all zenith angles. Given the magnitude of the shifts and the data sample size, the statistical significance of the improvement of data description using the modifications considered in the paper is larger than even for any linear combination of experimental systematic uncertainties.

Impact of the Magnetic Horizon on the Interpretation of the Pierre Auger Observatory Spectrum and Composition Data

Authors

A Abdul Halim,P Abreu,M Aglietta,I Allekotte,K Almeida Cheminant,A Almela,R Aloisio,J Alvarez-Muñiz,J Ammerman Yebra,GA Anastasi,L Anchordoqui,B Andrada,S Andringa,L Apollonio,C Aramo,PR Ferreira,E Arnone,JC Velázquez,P Assis,G Avila,E Avocone,A Bakalova,F Barbato,A Bartz Mocellin,JA Bellido,C Berat,ME Bertaina,G Bhatta,M Bianciotto,PL Biermann,V Binet,K Bismark,T Bister,J Biteau,J Blazek,C Bleve,J Blümer,M Boháčová,D Boncioli,C Bonifazi,L Bonneau Arbeletche,N Borodai,J Brack,PG Orchera,FL Briechle,A Bueno,S Buitink,M Buscemi,M Büsken,A Bwembya,KS Caballero-Mora,S Cabana-Freire,L Caccianiga,F Campuzano,R Caruso,A Castellina,F Catalani,G Cataldi,L Cazon,M Cerda,A Cermenati,JA Chinellato,J Chudoba,L Chytka,RW Clay,AC Cerutti,R Colalillo,MR Coluccia,R Conceição,A Condorelli,G Consolati,M Conte,F Convenga,D Santos,PJ Costa,CE Covault,M Cristinziani,CS Sanchez,S Dasso,K Daumiller,BR Dawson,RM de Almeida,J de Jesús,SJ de Jong,JRT Neto,I De Mitri,J de Oliveira,D Franco,F de Palma,V de Souza,BP de Errico,E De Vito,A Del Popolo,O Deligny,N Denner,L Deval,A Di Matteo,M Dobre,C Dobrigkeit,JC d'Olivo,LM Mendes,Q Dorosti,JC dos Anjos,RC dos Anjos,J Ebr,F Ellwanger,M Emam,R Engel,I Epicoco,M Erdmann,A Etchegoyen,C Evoli,H Falcke,G Farrar,AC Fauth,F Feldbusch,F Fenu,A Fernandes,B Fick,JM Figueira,A Filipčič,T Fitoussi,B Flaggs,T Fodran,T Fujii,A Fuster,C Galea,B García,C Gaudu,A Gherghel-Lascu,U Giaccari,J Glombitza,F Gobbi,F Gollan,G Golup,M Gómez Berisso,PF Vitale,JP Gongora,JM González,N González,D Góra,A Gorgi,M Gottowik,F Guarino,GP Guedes,E Guido,L Gülzow,S Hahn,P Hamal,MR Hampel

Journal

arXiv preprint arXiv:2404.03533

Published Date

2024/4/4

The flux of ultra-high energy cosmic rays reaching Earth above the ankle energy (5 EeV) can be described as a mixture of nuclei injected by extragalactic sources with very hard spectra and a low rigidity cutoff. Extragalactic magnetic fields existing between the Earth and the closest sources can affect the observed CR spectrum by reducing the flux of low-rigidity particles reaching Earth. We perform a combined fit of the spectrum and distributions of depth of shower maximum measured with the Pierre Auger Observatory including the effect of this magnetic horizon in the propagation of UHECRs in the intergalactic space. We find that, within a specific range of the various experimental and phenomenological systematics, the magnetic horizon effect can be relevant for turbulent magnetic field strengths in the local neighbourhood of order $B_{\rm rms}\simeq (50-100)\,{\rm nG}\,(20\rm{Mpc}/{d_{\rm s})( 100\,\rm{kpc}/L_{\rm coh}})^{1/2}$, with the typical intersource separation and the magnetic field coherence length. When this is the case, the inferred slope of the source spectrum becomes softer and can be closer to the expectations of diffusive shock acceleration, i.e., . An additional cosmic-ray population with higher source density and softer spectra, presumably also extragalactic and dominating the cosmic-ray flux at EeV energies, is also required to reproduce the overall spectrum and composition results for all energies down to 0.6~EeV.

Ground observations of a space laser for the assessment of its in-orbit performance

Authors

Oliver Lux,Isabell Krisch,Oliver Reitebuch,Dorit Huber,Denny Wernham,Tommaso Parrinello,Pierre Auger Collaboration

Journal

Optica

Published Date

2024/2/20

The wind mission Aeolus of the European Space Agency was a groundbreaking achievement for Earth observation. Between 2018 and 2023, the space-borne lidar instrument ALADIN onboard the Aeolus satellite measured atmospheric wind profiles with global coverage, which contributed to improving the accuracy of numerical weather prediction. The precision of the wind observations, however, declined over the course of the mission due to a progressive loss of the atmospheric backscatter signal. The analysis of the root cause was supported by the Pierre Auger Observatory in Argentina whose fluorescence detector registered the ultraviolet laser pulses emitted from the instrument in space, thereby offering an estimation of the laser energy at the exit of the instrument for several days in 2019, 2020, and 2021. The reconstruction of the laser beam not only allowed for an independent assessment of the Aeolus …

Demonstrating Agreement between Radio and Fluorescence Measurements of the Depth of Maximum of Extensive Air Showers at the Pierre Auger Observatory

Authors

A Abdul Halim,P Abreu,M Aglietta,I Allekotte,K Almeida Cheminant,A Almela,R Aloisio,J Alvarez-Muñiz,J Ammerman Yebra,GA Anastasi,L Anchordoqui,B Andrada,S Andringa,L Apollonio,C Aramo,PR Araújo Ferreira,E Arnone,JC Arteaga Velázquez,P Assis,G Avila,E Avocone,A Bakalova,F Barbato,A Bartz Mocellin,JA Bellido,C Berat,ME Bertaina,G Bhatta,M Bianciotto,PL Biermann,V Binet,K Bismark,T Bister,J Biteau,J Blazek,C Bleve,J Blümer,M Boháčová,D Boncioli,C Bonifazi,L Bonneau Arbeletche,N Borodai,J Brack,PG Brichetto Orchera,FL Briechle,A Bueno,S Buitink,M Buscemi,M Büsken,A Bwembya,KS Caballero-Mora,S Cabana-Freire,L Caccianiga,R Caruso,A Castellina,F Catalani,G Cataldi,L Cazon,M Cerda,A Cermenati,JA Chinellato,J Chudoba,L Chytka,RW Clay,AC Cobos Cerutti,R Colalillo,A Coleman,MR Coluccia,R Conceição,A Condorelli,G Consolati,M Conte,F Convenga,D Correia Dos Santos,PJ Costa,CE Covault,M Cristinziani,CS Cruz Sanchez,S Dasso,K Daumiller,BR Dawson,RM de Almeida,J de Jesús,SJ de Jong,JRT de Mello Neto,I De Mitri,J de Oliveira,D de Oliveira Franco,F de Palma,V de Souza,BP de Souza de Errico,E De Vito,A Del Popolo,O Deligny,N Denner,L Deval,A di Matteo,M Dobre,C Dobrigkeit,JC D’Olivo,LM Domingues Mendes,Q Dorosti,JC Dos Anjos,RC Dos Anjos,J Ebr,F Ellwanger,M Emam,R Engel,I Epicoco,M Erdmann,A Etchegoyen,C Evoli,H Falcke,J Farmer,G Farrar,AC Fauth,N Fazzini,F Feldbusch,F Fenu,A Fernandes,B Fick,JM Figueira,A Filipčič,T Fitoussi,B Flaggs,T Fodran,T Fujii,A Fuster,C Galea,C Galelli,B García,C Gaudu,H Gemmeke,F Gesualdi,A Gherghel-Lascu,PL Ghia,U Giaccari,J Glombitza,F Gobbi,F Gollan,G Golup,M Gómez Berisso,PF Gómez Vitale,JP Gongora,JM González,N González,I Goos,D Góra,A Gorgi,M Gottowik

Journal

Physical Review Letters

Published Date

2024/1/8

We show, for the first time, radio measurements of the depth of shower maximum (X max) of air showers induced by cosmic rays that are compared to measurements of the established fluorescence method at the same location. Using measurements at the Pierre Auger Observatory we show full compatibility between our radio and the previously published fluorescence dataset, and between a subset of air showers observed simultaneously with both radio and fluorescence techniques, a measurement setup unique to the Pierre Auger Observatory. Furthermore, we show radio X max resolution as a function of energy and demonstrate the ability to make competitive high-resolution X max measurements with even a sparse radio array. With this, we show that the radio technique is capable of cosmic-ray mass composition studies, both at Auger and at other experiments.

An update on the arrival direction studies made with data from the Pierre Auger Observatory

Authors

Geraldina Golup,A Abdul Halim,H Abreu,M Aglietta,T Bister,A Bwembya,SJ de Jong,M Eman,H Falcke,T Fodran,C Galea,JR Hörandel,A Khakurdikar,KB Mulrey,BBT Pont,M Pothast,W Rodrigues de Carvalho,M Saharan,H Schoorlemmer,C Timmermans,O Zapparrata,E Zas,D Zavrtanik

Published Date

2023

Thanks to the high-quality data from the Pierre Auger Observatory [1], the world’s largest cosmic ray observatory, significant progress has been made in the quest to find the origin of ultrahigh-energy cosmic rays (UHECRs). In particular, regarding the arrival direction studies, a dipolar modulation in RA at energies above 8EeV has been established with a significance above 5???? [2]. The direction of this dipole,∼ 115◦ away from the Galactic Center, suggests an extragalactic origin of cosmic rays above this energy threshold. Moreover, for lower energies, a change in the equatorial dipole amplitudes and phases has been observed [3]. But, given that the amplitudes are small, these results are not yet statistically significant. However, they are indicative of a transition in the origin of the anisotropies from a galactic one (with phases close to the Galactic Center) to an extragalactic one at energies above a few EeV.Magnetic deflections are proportional to ????/????, and cosmic rays have a reduced horizon at ultrahigh energies. Thus, we also search for small and intermediate-angular-scale anisotropies with the highest-energy events that could help to trace their sources. The Auger Collaboration has reported an excess in the Centaurus region, which has grown steadily since the beginning of the operation of the Observatory [4, 5]. Furthermore, an indication of anisotropy has been reported when searching for correlations with catalogs of potential sources. In particular, the most significant result is for the starburst catalog, which has two galaxies, NGC4945 and M83, in the Centaurus region and one, NGC253, in a region close to the Galactic South Pole, where a …

Chasing Gravitational Waves with the Chereknov Telescope Array

Authors

Jarred Gershon Green,Monica Seglar-Arroyo,Cta Consortium,Kazuki Abe,Shotaro Abe,Atreya Acharyya,Remi Adam,Arnau Aguasca-Cabot,Ivan Agudo,Jorge Alfaro,Nuria Alvarez-Crespo,Rafael Alves Batista,Jean-Philippe Amans,Elena Amato,Filippo Ambrosino,Ekrem Oguzhan Angüner,Lucio Angelo Antonelli,Carla Aramo,Cornelia Arcaro,Luisa Arrabito,Katsuaki Asano,Jann Aschersleben,Halim Ashkar,Luiz Augusto Stuani,Dominik Baack,Michael Backes,Csaba Balazs,Matteo Balbo,Andres Baquero Larriva,Victor Barbosa Martins,Ulisses Barres de Almeida,Juan Abel Barrio,Denis Bastieri,Pedro Ivo Batista,Ivana Batković,Rowan William Batzofin,Joshua Ryo Baxter,Geoffrey Beck,Julia Becker Tjus,Lukas Beiske,Daniele Belardinelli,Wystan Benbow,Elisa Bernardini,Juan Bernete Medrano,Konrad Bernlöhr,Alessio Berti,Vasyl Beshley,Pooja Bhattacharjee,Saptashwa Bhattacharyya,Baiyang Bi,Noah Biederbeck,Adrian Biland,Elisabetta Bissaldi,Oscar Blanch,Jiri Blazek,Catherine Boisson,Julien Bolmont,Giacomo Bonnoli,Pol Bordas,Željka Bošnjak,Federica Bradascio,Catherine Braiding,Ettore Bronzini,Robert Brose,Anthony M Brown,Francois Brun,Giulia Brunelli,Andrea Bulgarelli,Irene Burelli,Leonid Burmistrov,Michael Burton,Tomas Bylund,Paolo Gherardo Calisse,Anna Campoy-Ordaz,Brandon Khan Cantlay,Milvia Capalbi,Anderson Caproni,Roberto Capuzzo-Dolcetta,Colin Carlile,Sami Caroff,Alessandro Carosi,Roberto Carosi,Marie-Sophie Carrasco,Enrico Cascone,Franca Cassol,Noelia Castrejon,Fernando Catalani,Davide Cerasole,Matteo Cerruti,Sylvain Chaty,Andrew W Chen,Maria Chernyakova,Andrea Chiavassa,Jiří Chudoba,Carlos Henrique Coimbra Araujo,Vito Conforti,Francesco Conte,Jose Luis Contreras,Christophe Cossou,Alessandro Costa,Heide Costantini,Pierre Cristofari,Omar Cuevas,Zachary Curtis-Ginsberg,Giacomo D'Amico,Filippo D'Ammando,Mauro Dadina,Mykhailo Dalchenko,Ludovic David,Isak Delberth Davids,Francesco Dazzi,Alessandro De Angelis,Mathieu de Bony de Lavergne,Vincenzo De Caprio,Giovanni De Cesare,Elisabete M Pino,Barbara De Lotto,Mario de Lucia,Raniere de Menezes,Mathieu de Naurois,Emma de Oña Wilhelmi,Nicola De Simone,Vitor de Souza,Luis Del Peral,Maria Victoria del Valle,Eric Delagnes,Andres Gabriel Delgado Giler,Carlos Delgado,Michael Dell'aiera,Roberto Della Ceca,Massimo Della Valle,Davide Depaoli,Antonios Dettlaff,Tristano Di Girolamo,Ambra Di Piano,Federico Di Pierro,Riccardo Di Tria,Leonardo Di Venere,Christian Díaz-Bahamondes,Claudio Dib,Sebastian Diebold,Razvan Dima,Adithiya Dinesh,Arache Djannati-Ataï,Julia Isabel Djuvsland,Alberto Dominguez,Rune Michael Dominik,Alice Donini,Daniela Dorner,Julien Dörner

Journal

arXiv preprint arXiv:2310.07413

Published Date

2023/10/11

The detection of gravitational waves from a binary neutron star merger by Advanced LIGO and Advanced Virgo (GW170817), along with the discovery of the electromagnetic counterparts of this gravitational wave event, ushered in a new era of multimessenger astronomy, providing the first direct evidence that BNS mergers are progenitors of short gamma-ray bursts (GRBs). Such events may also produce very-high-energy (VHE, > 100GeV) photons which have yet to be detected in coincidence with a gravitational wave signal. The Cherenkov Telescope Array (CTA) is a next-generation VHE observatory which aims to be indispensable in this search, with an unparalleled sensitivity and ability to slew anywhere on the sky within a few tens of seconds. New observing modes and follow-up strategies are being developed for CTA to rapidly cover localization areas of gravitational wave events that are typically larger than the CTA field of view. This work will evaluate and provide estimations on the expected number of of gravitational wave events that will be observable with CTA, considering both on- and off-axis emission. In addition, we will present and discuss the prospects of potential follow-up strategies with CTA.

Search for photons above 1019 eV with the surface detector of the Pierre Auger Observatory

Authors

Pedro Abreu,M Aglietta,I Allekotte,K Almeida Cheminant,A Almela,J Alvarez-Muñiz,J Ammerman Yebra,GA Anastasi,L Anchordoqui,B Andrada,S Andringa,C Aramo,PR Araújo Ferreira,E Arnone,JC Arteaga Velázquez,H Asorey,P Assis,G Avila,E Avocone,AM Badescu,A Bakalova,A Balaceanu,F Barbato,JA Bellido,C Berat,ME Bertaina,G Bhatta,PL Biermann,V Binet,K Bismark,T Bister,J Biteau,J Blazek,C Bleve,J Blümer,M Boháčová,D Boncioli,C Bonifazi,L Bonneau Arbeletche,N Borodai,J Brack,T Bretz,PG Brichetto Orchera,FL Briechle,P Buchholz,A Bueno,S Buitink,M Buscemi,M Büsken,A Bwembya,KS Caballero-Mora,L Caccianiga,I Caracas,R Caruso,A Castellina,F Catalani,G Cataldi,L Cazon,M Cerda,JA Chinellato,J Chudoba,L Chytka,RW Clay,AC Cobos Cerutti,R Colalillo,A Coleman,MR Coluccia,R Conceição,A Condorelli,G Consolati,F Contreras,F Convenga,D Correia Dos Santos,CE Covault,M Cristinziani,S Dasso,K Daumiller,BR Dawson,RM De Almeida,J De Jesús,SJ De Jong,JRT de Mello Neto,I De Mitri,J De Oliveira,D de Oliveira Franco,F De Palma,V De Souza,E De Vito,A Del Popolo,O Deligny,L Deval,A Di Matteo,M Dobre,C Dobrigkeit,JC d'Olivo,LM Domingues Mendes,RC Dos Anjos,J Ebr,M Eman,R Engel,I Epicoco,M Erdmann,CO Escobar,A Etchegoyen,H Falcke,J Farmer,G Farrar,AC Fauth,N Fazzini,F Feldbusch,F Fenu,B Fick,JM Figueira,A Filipčič,T Fitoussi,T Fodran,T Fujii,A Fuster,C Galea,C Galelli,B García,H Gemmeke,F Gesualdi,A Gherghel-Lascu,PL Ghia,U Giaccari,M Giammarchi,J Glombitza,F Gobbi,F Gollan,G Golup,M Gómez Berisso,PF Gómez Vitale,JP Gongora,JM González,N González,I Goos,D Góra,A Gorgi,M Gottowik,TD Grubb,F Guarino,GP Guedes,E Guido,S Hahn,P Hamal,MR Hampel,P Hansen,D Harari,VM Harvey

Journal

Journal of Cosmology and Astroparticle Physics

Published Date

2023/5/9

We use the surface detector of the Pierre Auger Observatory to search for air showers initiated by photons with an energy above 1019 eV. Photons in the zenith angle range from 30◦ to 60◦ can be identified in the overwhelming background of showers initiated by charged cosmic rays through the broader time structure of the signals induced in the water-Cherenkov detectors of the array and the steeper lateral distribution of shower particles reaching ground. Applying the search method to data collected between January 2004 and June 2020, upper limits at 95% CL are set to an E− 2 diffuse flux of ultra-high energy photons above 1019 eV, 2× 1019 eV and 4× 1019 eV amounting to 2. 11× 10− 3, 3. 12× 10− 4 and 1. 72× 10− 4 km− 2 sr− 1 yr− 1, respectively. While the sensitivity of the present search around 2× 1019 eV approaches expectations of cosmogenic photon fluxes in the case of a pure-proton composition, it is …

International Masterclasses as part of the Pierre Auger Observatory program of Outreach and Education

Authors

R Sarmento,A Abdul Halim,H Abreu,M Aglietta,T Bister,A Bwembya,SJ de Jong,M Eman,H Falcke,T Fodran,C Galea,JR Hörandel,A Khakurdikar,KB Mulrey,BBT Pont,M Pothast,W Rodrigues de Carvalho,M Saharan,H Schoorlemmer,C Timmermans,O Zapparrata,E Zas,D Zavrtanik

Published Date

2023

The Pierre Auger Observatory has a rich program of Outreach and Education that comprises a strong presence online and a variety of initiatives taking place at the local, regional and international levels [1]. The online presence is established by a dedicated outreach web page with extensive explanatory content on cosmic rays and a virtual tour to the observatory, as well as by social network accounts with regular posts for a total of about 6 600 followers [2]. Two of the initiatives with highest impact to the students and populations of the region are the Malargüe Science Fair and the Visitor Center of the observatory. The Science Fair happens every two years and involves students of several ages, from primary to adult schools in Argentina, in the development and presentation of science projects. Selected projects are presented in Malargüe and discussed with scientists of the Pierre Auger Collaboration. The last edition took place on November 2022 and counted 21 projects and more than 600 visitors, as reported in Fig. 1. The Auger Visitor Center, located at the observatory building in Malargüe, is permanently open to the public with an interactive exposition. The number of visitors, mainly from Argentina, has recovered in 2022 to pre-pandemic peak values of nearly 10 000 visitors per year. At the beginning of 2023, the center was renewed with additional exhibitors, such as an on-screen virtual assistant, new small-scale models of the observatory facilities, working detectors and a manned-balloon structure with goggles for a virtual-reality tour to the field. The Auger Collaboration is also engaged with initiatives promoted by international institutions …

The dynamic range of the upgraded surface-detector stations of AugerPrime

Authors

Gioacchino Alex Anastasi,A Abdul Halim,H Abreu,M Aglietta,T Bister,A Bwembya,SJ de Jong,M Eman,H Falcke,T Fodran,C Galea,JR Hörandel,A Khakurdikar,KB Mulrey,BBT Pont,M Pothast,W Rodrigues de Carvalho,M Saharan,H Schoorlemmer,C Timmermans,O Zapparrata,E Zas,D Zavrtanik

Published Date

2023

The Surface Detector (SD) of the Pierre Auger Observatory comprises about 1600 water-Cherenkov detectors arranged in an 1.5 km triangular grid over an area of∼ 3000 km2. Extensive air-showers are measured by recording the signals and arrival times of the secondary particles at the ground level, which spread over areas larger than 15km2 for primary energies above 3EeV. The Cherenkov light produced by the shower particles in each WCD are collected by three 9-inch Photonis XP1805 photomultipliers (Large PMTs, LPMTs), for which each input is split in two channels, one amplified (High Gain) with a factor of 32 with respect to the other (Low Gain). Such gain ratio is required to achieve a dynamic range of measurement varying from very low signals generated by single atmospheric muons (used to calibrate the detector), to small signals produced by few shower particles reaching the stations far from the impact point of the shower core at the ground, up to hundreds of thousands of particles in the station closest to the core. When the distance between the detector and the shower core is shorter than a few hundred meters, the dynamic range turns out to be insufficient to record the signal produced by the huge amount of secondary particles hitting the WCD, which is then tagged as saturated. The saturation initially appears only in the digitized signal traces, as it is due to the FADCs overflow. An actual saturation of the photomultiplier is instead observed when extreme amounts of light reach the LPMTs photocathodes, resulting in a deviation from the linear response. A recovery procedure [1] was implemented to estimate the loss of signal due …

Investigating the UHECR characteristics from cosmogenic neutrino limits with the measurements of the Pierre Auger Observatory

Authors

Camilla Petrucci,Andrej Filipčič,Jon Paul Lundquist,Shima Ujjani Shivashankara,Samo Stanič,Serguei Vorobiov,Danilo Zavrtanik,Marko Zavrtanik

Journal

38th International Cosmic Ray Conference [also] ICRC2023

Published Date

2023

Cosmogenic neutrinos are expected to be produced during the extragalactic propagation of ultrahigh-energy cosmic rays (UHECRs), as a consequence of their interactions with photon fields such as the cosmic microwave background (CMB) or the extragalactic background light (EBL), where the produced charged mesons subsequently decay, producing neutrinos. Due to these reactions, the visible Universe in UHECRs is much more limited than what can be seen in neutrinos, which can reach us without interacting in their extragalactic travel. Neutrinos can therefore bring information on parameters relevant for UHECR source classes which are connected with the cosmological distribution, as well as with the maximum redshift of the sources contributing to UHECRs. In [1], a pure-proton scenario for UHECRs was used to constrain the source evolution and the maximum redshift of the UHECR source class, through the associated cosmogenic neutrinos. The aim of the present work is to take into account the most up-to-date upper limits from the Pierre Auger Observatory, shown in [2] and [3] with a pure-proton scenario for the UHECRs at the escape from the sources. In addition, here we also explore scenarios where the mass fractions and the spectral parameters at the emission from the sources are considered as free parameters, by taking into account the entire energy range across and above the ankle for the fit of the energy spectrum and the mass composition, as done in [4]. The outcome in cosmogenic neutrinos is thus exploited to possibly indicate the characteristics of UHECR source classes dominating different energy ranges. Being the …

The Pierre Auger Observatory Open Data

Authors

Journal

arXiv preprint arXiv:2309.16294

Published Date

2023/9/28

The Pierre Auger Collaboration has embraced the concept of open access to their research data since its foundation, with the aim of giving access to the widest possible community. A gradual process of release began as early as 2007 when 1% of the cosmic-ray data was made public, along with 100% of the space-weather information. In February 2021, a portal was released containing 10% of cosmic-ray data collected from 2004 to 2018, during Phase I of the Observatory. The Portal included detailed documentation about the detection and reconstruction procedures, analysis codes that can be easily used and modified and, additionally, visualization tools. Since then the Portal has been updated and extended. In 2023, a catalog of the 100 highest-energy cosmic-ray events examined in depth has been included. A specific section dedicated to educational use has been developed with the expectation that these data will be explored by a wide and diverse community including professional and citizen-scientists, and used for educational and outreach initiatives. This paper describes the context, the spirit and the technical implementation of the release of data by the largest cosmic-ray detector ever built, and anticipates its future developments.

The performances of the upgraded surface detector stations of AugerPrime

Authors

Fabio Convenga,A Abdul Halim,H Abreu,M Aglietta,T Bister,A Bwembya,SJ de Jong,M Eman,H Falcke,T Fodran,CF Galea,JR Hörandel,A Khakurdikar,KB Mulrey,BBT Pont,M Pothast,W Rodrigues de Carvalho,M Saharan,H Schoorlemmer,C Timmermans,O Zapparrata,E Zas,D Zavrtanik

Published Date

2023

Figure 1:(Left) A surface station upgraded with AugerPrime detectors. Visible are the SSD on top of the WCD, together with the radio detector, which is the antenna on top of the SSD. The UUB is placed under the dome (red annotation), which is visible between the top of the WCD and the bottom of the SSD.(Right) Photo of a UUB, it when installed under the dome is primarily inserted in a metal shielding for protection.

A catalog of the highest-energy cosmic rays recorded during phase I of operation of the Pierre Auger Observatory

Authors

A Abdul Halim,Pedro Abreu,Marco Aglietta,Ingomar Allekotte,Patrick Allison,K Almeida Cheminant,Alejandro Almela,Jaime Alvarez-Muñiz,J Ammerman Yebra,Gioacchino Alex Anastasi,Luis Anchordoqui,Belén Andrada,Sofia Andringa,Carla Aramo,PR Araújo Ferreira,Enrico Arnone,JC Arteaga Velázquez,H Asorey,Pedro Assis,Maximo Ave,Gualberto Avila,Emanuele Avocone,Alina Mihaela Badescu,Alena Bakalova,Alexandru Balaceanu,Felicia Barbato,Jim Beatty,Jose A Bellido,Corinne Berat,Mario Edoardo Bertaina,Xavier Bertou,Gopal Bhatta,PL Biermann,P Billoir,Virginia Binet,Kathrin Bismark,Teresa Bister,Jonathan Biteau,Jiri Blazek,Carla Bleve,Johannes Blümer,Martina Boháčová,Denise Boncioli,Carla Bonifazi,L Bonneau Arbeletche,Nataliia Borodai,Jeffrey Brack,Thomas Bretz,PG Brichetto Orchera,Florian Lukas Briechle,Peter Buchholz,Antonio Bueno,Stijn Buitink,Mario Buscemi,Max Büsken,Anthony Bwembya,Karen S Caballero-Mora,Lorenzo Caccianiga,Ioana Caracas,Rossella Caruso,Antonella Castellina,Fernando Catalani,Gabriella Cataldi,Lorenzo Cazon,Marcos Cerda,Rosanna Cester,Jose Augusto Chinellato,Johana Chirinos,Jiri Chudoba,Ladislav Chytka,Roger W Clay,AC Cobos Cerutti,Roberta Colalillo,Alan Coleman,Maria Rita Coluccia,Ruben Conceição,Antonio Condorelli,Giovanni Consolati,Fernando Contreras,Fabio Convenga,D Correia dos Santos,CE Covault,Markus Cristinziani,CS Cruz Sanchez,Sergio Dasso,Kai Daumiller,Bruce R Dawson,Rogerio M de Almeida,Joaquín de Jesús,Sijbrand J de Jong,JRT de Mello Neto,Ivan De Mitri,Jaime de Oliveira,Danelise de Oliveira Franco,Francesco de Palma,Vitor de Souza,Emanuele De Vito,Antonino Del Popolo,Olivier Deligny,Luca Deval,Armando Di Matteo,Madalina Dobre,Carola Dobrigkeit,Juan Carlos D’Olivo,LM Domingues Mendes,Alexei Dorofeev,RC dos Anjos,Jan Ebr,Mohamed Eman,Ralph Engel,Italo Epicoco,Martin Erdmann,Alberto Etchegoyen,Heino Falcke,John Farmer,Glennys Farrar,AC Fauth,Norberto Fazzini,Fridtjof Feldbusch,Francesco Fenu,Brian Fick,Juan Manuel Figueira,Andrej Filipčič,Thomas Fitoussi,Benjamin Flaggs,Tomas Fodran,Toshihiro Fujii,Alan Fuster,Cristina Galea,Claudio Galelli,Beatriz García,Hartmut Gemmeke,Flavia Gesualdi,Alexandru Gherghel-Lascu,Piera Luisa Ghia,Ugo Giaccari,Marco Giammarchi,Jonas Glombitza,Fabian Gobbi,Fernando Gollan,Geraldina Golup,M Gómez Berisso,PF Gómez Vitale,Juan Pablo Gongora,Juan Manuel González,Nicolás González,Isabel Goos,Dariusz Góra,Alessio Gorgi,Marvin Gottowik

Journal

The Astrophysical Journal Supplement Series

Published Date

2023/2/7

The energy spectrum of cosmic rays extends to beyond 100EeV. Where and how these particles, predominantly the nuclei of the common elements up to iron, are accelerated is one of the major puzzles of astroparticle physics. The flux above 50 EeV is about 0.5 particles per square kilometer per century, so that measuring their properties requires the detection of the cascades or air showers that the particles create in the atmosphere. In this paper, the methods used by the Pierre Auger Collaboration to obtain the arrival directions and energies of the 100 highest-energy particles in the range 78–166 EeV are outlined, and details of the main features of the air showers produced by the cosmic rays are presented. Phase I of operation of the observatory ended on 2020 December 31. It is thus timely to release a catalog to demonstrate the quality of the data that lie behind measurements of the energy spectrum, the …

Constraints on upward-going air showers using the Pierre Auger Observatory data

Authors

Adila Abdul Halim,Pedro Abreu,Marco Aglietta,Ingomar Allekotte,Kévin Almeida Cheminant,Alejandro Almela,Roberto Aloisio,Jaime Alvarez-Muniz,Juan Ammerman Yebra,Gioacchino Alex Anastasi,Luis A Anchordoqui,Belén Andrada,Sofia Andringa,Carla Aramo,Paulo Ricardo Araújo Ferreira,Enrico Arnone,Juan Carlos Arteaga Velazquez,Hernán Gonzalo Asorey,Pedro Assis,Gualberto Avila,Emanuele Avocone,Alina Mihaela Badescu,Alena Bakalova,Alexandru Balaceanu,Felicia Barbato,Adriel Bartz Mocellin,Jose A Bellido,Corinne Berat,Mario Edoardo Bertaina,Gopal Bhatta,Marta Bianciotto,Peter L Biermann,Virginia Binet,Kathrin Bismark,Teresa Bister,Jonathan Biteau,Jiri Blazek,Carla Bleve,Johannes Blümer,Martina Bohacova,Denise Boncioli,Carla Bonifazi,Luan Bonneau Arbeletche,Nataliia Borodai,Jeffrey Brack,Brichetto Orchera,P Gabriel,Florian Lukas Briechle,Antonio Bueno,Stijn Buitink,Mario Buscemi,Max Büsken,Anthony Bwembya,Karen S Caballero-Mora,Sergio Cabana-Freire,Lorenzo Caccianiga,Ioana Caracas,Rossella Caruso,Antonella Castellina,Fernando Catalani,Gabriella Cataldi,Lorenzo Cazon,Marcos Cerda,Alessandro Cermenati,Jose Augusto Chinellato,Jiří Chudoba,Ladislav Chytka,Roger W Clay,Agustín Cobos Cerutti,Roberta Colalillo,Alan Coleman,Maria Rita Coluccia,Rúben Conceição,Antonio Condorelli,Giovanni Consolati,Matteo Conte,Fabio Convenga,Diego Correia dos Santos,Pedro J Costa,Corbin Covault,Markus Cristinziani,Carlo Salvattore Cruz Sanchez,Sergio Dasso,Kai Daumiller,Bruce R Dawson,Rogerio M De Almeida,Joaquin De Jesus,Sijbrand J De Jong,João De Mello Neto,Ivan De Mitri,Jaime De Oliveira,Oliveira Franco,Danelise De,Francesco De Palma,Vitor De Souza,Emanuele De Vito,Antonino Del Popolo,Olivier Deligny,Nikolas Denner,Luca Deval,Armando Di Matteo,Madalina Dobre,Carola Dobrigkeit,Juan Carlos D'Olivo,Luis Miguel Domingues Mendes,Joao Dos Anjos,Rita Cassia Dos Anjos,Jan Ebr,Fiona H Ellwanger,Mohamed Emam,Ralph Engel,Italo Epicoco,Martin Erdmann,Alberto Etchegoyen,Carmelo Evoli,Heino Falcke,John Farmer,Glennys R Farrar,Anderson Fauth,Norberto Fazzini,Fridtjof Feldbusch,Francesco Fenu,Alexandra Fernandes,Brian Fick,Juan Manuel Figueira,Andrej Filipcic,Thomas Fitoussi,Benjamin Flaggs,Tomáš Fodran,Toshihiro Fujii,Alan Fuster,Cristina Galea,Claudio Galelli,Beatriz García,Chloé Gaudu,Hartmut Gemmeke,Flavia Gesualdi,Alexandru Gherghel-Lascu,Piera Luisa Ghia,Ugo Giaccari,Marco Giammarchi,Jonas Glombitza,Fabian Gobbi,Fernando Gollan,Geraldina Golup,Mariano Gómez Berisso,Primo F Gómez Vitale,Juan Pablo Gongora,Juan Manuel González,Nicolas Martin Gonzalez

Journal

38th International Cosmic Ray Conference (ICRC2023)-Neutrino Astronomy & Physics (NU)

Published Date

2023

The fluorescence detector (FD) of the Pierre Auger Observatory is sensitive to upward-going air showers with energies above 1017eV. Given its operation time and wide field of view, the FD has the potential to support or constrain the "anomalous" observations by the ANITA detector, interpreted as upward-going air showers that would be indicative of Beyond Standard Model (BSM) physics. To this end, a search for upward-going air showers with the FD has been performed applying selection criteria that were optimized using 10% of FD data. Dedicated background simulations (downward-going events) have been performed to estimate our capability to distinguish candidates from false positives. Also dedicated signal simulations (upward-going events) have been used to estimate our sensitivity to such showers with a focus on the energy region close to the ANITA observations. Improved and updated results of the Pierre Auger Observatory exposure to upward-going showers will be presented after the unblinding of 14 years of FD data. Extensive simulations allow the FD exposure to be obtained at lower energies which are particularly relevant for the comparison with the ANITA results. A refinement of the method for signal discrimination and background rejection has also been applied. The implications are discussed under the assumption that the ANITA events were due to upward-going events.

Search for evidence of neutron fluxes using Pierre Auger Observatory data

Authors

Danelise de Oliveira Franco,A Abdul Halim,H Abreu,M Aglietta,T Bister,A Bwembya,SJ de Jong,M Eman,H Falcke,T Fodran,C Galea,JR Hörandel,A Khakurdikar,KB Mulrey,BBT Pont,M Pothast,W Rodrigues de Carvalho,M Saharan,H Schoorlemmer,C Timmermans,O Zapparrata,E Zas,D Zavrtanik

Published Date

2023

One central open question regarding ultra-high-energy cosmic rays is the identification of their sources. Since charged particles are deflected by interstellar magnetic fields, the identification of the sources based only on their arrival directions can be challenging, although some breakthroughs have been obtained in the past decade [1]. On the other hand, the arrival directions of neutral particles point directly to their sources, making neutral particles a powerful tool in the investigation of cosmic ray sources. Even though free neutrons undergo ????-decay with a mean lifetime of around 879 s [2], they travel a distance around 9.2 kpc (????/EeV) in the ultra-relativistic regime. Therefore, considering the possible traveled distance, we can investigate neutron fluxes in the EeV range from Galactic sources.The production of ultra-high-energy protons from a source is expected to be accompanied by the generation of neutrons. These neutrons can be generated through photopion production processes or other nuclear interactions nearby the source. A possible mechanism to produce neutrons is ultra-high-energy proton collisions with ambient protons or photons [3]. Since neutron production mechanisms can be associated with ????-rays, we can explore ????-ray sources as potential candidates for EeV neutron sources.

Constraints on metastable superheavy dark matter coupled to sterile neutrinos with the Pierre Auger Observatory

Authors

A Abdul Halim,Pedro Abreu,Marco Aglietta,Ingomar Allekotte,K Almeida Cheminant,Alejandro Almela,Roberto Aloisio,Jaime Alvarez-Muñiz,J Ammerman Yebra,Gioacchino Alex Anastasi,Luis Anchordoqui,Belén Andrada,Sofia Andringa,Lorenzo Apollonio,Carla Aramo,PR Ferreira,Enrico Arnone,JC Velázquez,Pedro Assis,Gualberto Avila,Emanuele Avocone,Alena Bakalova,Felicia Barbato,A Bartz Mocellin,Jose A Bellido,Corinne Berat,Mario Edoardo Bertaina,Gopal Bhatta,Marta Bianciotto,PL Biermann,Virginia Binet,Kathrin Bismark,Teresa Bister,Jonathan Biteau,Jiri Blazek,Carla Bleve,Johannes Blümer,Martina Boháčová,Denise Boncioli,Carla Bonifazi,L Bonneau Arbeletche,Nataliia Borodai,Jeffrey Brack,PG Orchera,Florian Lukas Briechle,Antonio Bueno,Stijn Buitink,Mario Buscemi,Max Büsken,Anthony Bwembya,Karen S Caballero-Mora,Sergio Cabana-Freire,Lorenzo Caccianiga,Federico Campuzano,Rossella Caruso,Antonella Castellina,Fernando Catalani,Gabriella Cataldi,Lorenzo Cazon,Marcos Cerda,Alessandro Cermenati,Jose Augusto Chinellato,Jiri Chudoba,Ladislav Chytka,Roger W Clay,Agustín Cobos Cerutti,Roberta Colalillo,Maria Rita Coluccia,Ruben Conceição,Antonio Condorelli,Giovanni Consolati,Matteo Conte,Fabio Convenga,D Santos,Pedro J Costa,CE Covault,Markus Cristinziani,CS Sanchez,Sergio Dasso,Kai Daumiller,Bruce R Dawson,Rogerio M de Almeida,Joaquín de Jesús,Sijbrand J de Jong,JRT Neto,Ivan De Mitri,Jaime de Oliveira,D Franco,Francesco de Palma,Vitor de Souza,BP de Errico,Emanuele De Vito,Antonino Del Popolo,Olivier Deligny,Nikolas Denner,Luca Deval,Armando Di Matteo,Madalina Dobre,Carola Dobrigkeit,Juan Carlos d'Olivo,LM Mendes,Qader Dorosti,JC dos Anjos,RC dos Anjos,Jan Ebr,Fiona Ellwanger,Mohamed Emam,Ralph Engel,Italo Epicoco,Martin Erdmann,Alberto Etchegoyen,Carmelo Evoli,Heino Falcke,Glennys Farrar,AC Fauth,Norberto Fazzini,Fridtjof Feldbusch,Francesco Fenu,Alexandra Fernandes,Brian Fick,Juan Manuel Figueira,Andrej Filipčič,Thomas Fitoussi,Benjamin Flaggs,Tomas Fodran,Toshihiro Fujii,Alan Fuster,Cristina Galea,Claudio Galelli,Beatriz García,Chloé Gaudu,Hartmut Gemmeke,Flavia Gesualdi,Alexandru Gherghel-Lascu,Piera Luisa Ghia,Ugo Giaccari,Jonas Glombitza,Fabian Gobbi,Fernando Gollan,Geraldina Golup,M Gómez Berisso,PF Vitale,Juan Pablo Gongora,Juan Manuel González,Nicolás González,Dariusz Góra,Alessio Gorgi,Marvin Gottowik,Trent D Grubb,F Guarino

Journal

arXiv preprint arXiv:2311.14541

Published Date

2023/11/24

Dark matter particles could be superheavy, provided their lifetime is much longer than the age of the universe. Using the sensitivity of the Pierre Auger Observatory to ultra-high energy neutrinos and photons, we constrain a specific extension of the Standard Model of particle physics that meets the lifetime requirement for a superheavy particle by coupling it to a sector of ultra-light sterile neutrinos. Our results show that, for a typical dark coupling constant of 0.1, the mixing angle between active and sterile neutrinos must satisfy, roughly, for a mass of the dark-matter particle between and GeV.

Sensitivity of the Cherenkov Telescope Array to spectral signatures of hadronic PeVatrons with application to Galactic Supernova Remnants

Authors

Fabio Acero,A Acharyya,R Adam,A Aguasca-Cabot,Ivan Agudo,A Aguirre-Santaella,J Alfaro,Roberto Aloisio,N Álvarez Crespo,R Alves Batista,Lorenzo Amati,Elena Amato,Giovanni Ambrosi,EO Angüner,Carla Aramo,C Arcaro,T Armstrong,K Asano,Y Ascasibar,J Aschersleben,M Backes,A Baktash,Csaba Balazs,Matteo Balbo,Jean Ballet,A Baquero Larriva,V Barbosa Martins,U Barres de Almeida,Juan A Barrio,Denis Bastieri,JR Baxter,J Becker Tjus,W Benbow,Maria I Bernardos-Martin,J Bernete,Alessio Berti,Bruna Bertucci,V Beshley,Pooja Bhattacharjee,Saptashwa Bhattacharyya,A Biland,Elisabetta Bissaldi,J Biteau,Oscar Blanch,Pol Bordas,E Bottacini,Johan Bregeon,Robert Brose,N Bucciantini,A Bulgarelli,M Capasso,RA Capuzzo Dolcetta,P Caraveo,M Cardillo,R Carosi,S Casanova,E Cascone,F Cassol,F Catalani,M Cerruti,P Chadwick,S Chaty,A Chen,M Chernyakova,A Chiavassa,J Chudoba,C Coimbra-Araujo,V Conforti,JL Contreras,A Costa,H Costantini,P Cristofari,R Crocker,G D’amico,F D’ammando,A De Angelis,V De Caprio,EM de Gouveia Dal Pino,E de Ona Wilhelmi,V de Souza,C Delgado,D Della Volpe,D Depaoli,T Di Girolamo,F Di Pierro,R Di Tria,L Di Venere,S Diebold,JI Djuvsland,A Donini,M Doro,RDC Dos Anjos,VV Dwarkadas,S Einecke,D Elsässer,G Emery,C Evoli,D Falceta-Goncalves,E Fedorova,S Fegan,G Ferrand,E Fiandrini,M Filipovic,V Fioretti,M Fiori,L Foffano,G Fontaine,S Fukami,G Galanti,G Galaz,V Gammaldi,C Gasbarra,A Ghalumyan,G Ghirlanda,M Giarrusso,G Giavitto,N Giglietto,F Giordano,M Giroletti,A Giuliani,L Giunti,N Godinovic,J Goulart Coelho,L Gréaux,D Green,M-H Grondin,O Gueta,S Gunji,T Hassan,M Heller,S Hernández-Cadena,J Hinton,B Hnatyk,R Hnatyk,D Hoffmann,W Hofmann,J Holder,D Horan,P Horvath,M Hrabovsky,D Hrupec,T Inada,F Incardona,S Inoue,K Ishio,Marek Jamrozy,P Janecek,I Jiménez Martínez,W Jin,I Jung-Richardt

Journal

Astroparticle Physics

Published Date

2023/8/1

Abstract The local Cosmic Ray (CR) energy spectrum exhibits a spectral softening at energies around 3 PeV. Sources which are capable of accelerating hadrons to such energies are called hadronic PeVatrons. However, hadronic PeVatrons have not yet been firmly identified within the Galaxy. Several source classes, including Galactic Supernova Remnants (SNRs), have been proposed as PeVatron candidates. The potential to search for hadronic PeVatrons with the Cherenkov Telescope Array (CTA) is assessed. The focus is on the usage of very high energy γ-ray spectral signatures for the identification of PeVatrons. Assuming that SNRs can accelerate CRs up to knee energies, the number of Galactic SNRs which can be identified as PeVatrons with CTA is estimated within a model for the evolution of SNRs. Additionally, the potential of a follow-up observation strategy under moonlight conditions for PeVatron …

Depth of maximum of air-shower profiles: testing the compatibility of the measurements at the Pierre Auger Observatory and the Telescope Array

Authors

Adila Abdul Halim,Andrej Filipčič,Jon Paul Lundquist,Shima Ujjani Shivashankara,Samo Stanič,Serguei Vorobiov,Danilo Zavrtanik,Marko Zavrtanik

Journal

38th International Cosmic Ray Conference [also] ICRC2023

Published Date

2023

In this report, the mass composition working group presents the results of the comparison of the measurements of the depth of maximum of air-shower profiles, max, performed at the Pierre Auger Observatory (Auger)[1] and the Telescope Array (TA)[2]. At both observatories, the measurements are performed using fluorescence detectors (FD) however due to different strategies to the event selection and corrections of the detector effect discussed below, the comparison of the max data sets is not direct and should be performed taking these differences into consideration. In previous analyses of the working group, a good agreement between the Auger and TA data was found regarding the energy evolution of the two first central max moments and the compatibility of the max distributions, see [3, 4] for the most recent results. In this report we present an update of the analysis presented at the UHECR 2022 Symposium [4] with the improved testing of the compatibility of the max distributions.

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