Update on full-sky searches for large- and medium-scale anisotropies in the UHECR flux using the Pierre Auger Observatory and the Telescope Array
Year: 2025
Type: conference-paper
Abstract: The flux of ultra-high-energy cosmic rays (UHECRs) is remarkably uniform across all directions in the sky. The only anisotropy detected with a significance greater than~$5\sigma$ is a large-scale dipolar modulation in right ascension for energies above~$8~\mathrm{EeV}$. To enhance our sensitivity to potential anisotropies, which may be obscured by significant deflections by magnetic fields, two strategies can be employed: (1)~focusing on large-scale anisotropies, such as the dipole and quadrupole moments across various energy intervals, which are anticipated to be more resilient to magnetic deflections; or (2)~focusing on the highest energies, where the background from distant sources is more attenuated. The unique aspect of our research is achieving full-sky coverage by combining data for the Pierre Auger Observatory and the Telescope Array, which would not be possible with a single detector array. This comprehensive coverage enables the application of analysis techniques that would otherwise require specific assumptions with partial sky coverage. Accounting for potential systematic effects in energy reconstruction is crucial to avoid spurious north–south anisotropies; the overlapping sky region observed by both arrays allows us to address this in an entirely data-driven manner. In this contribution, we present the latest results using the largest UHECR dataset collected to date, with events detected until December~2022 at the Pierre Auger Observatory and until May~2024 at the Telescope Array. It is shown that the dipolar modulation is the only anisotropy that is significantly (4.6$\sigma$) identified in the angular power spectrum. The hypothesis of correlations with the starburst galaxies is supported at the significance of 4.4$\sigma$.
DOI: 10.22323/1.484.0009
Authors: Grigory Rubtsov, Adila Abdul Halim, Pedro Abreu, Marco Aglietta, Ingomar Allekotte, Kevin Almeida Cheminant, Alejandro Almela, Roberto Aloisio, Jaime Alvarez-Muñiz, Antonio Ambrosone, Juan Ammerman Yebra, Gioacchino Alex Anastasi, Luis A. Anchordoqui, Belén Andrada, Luciana Andrade Dourado, Sofia Andringa, Lorenzo Apollonio, Carla Aramo, Enrico Arnone, Juan Carlos Arteaga Velazquez, Pedro Assis, Gualberto Avila, Emanuele Avocone, Alena Bakalova, Felicia Barbato, Adriel Bartz Mocellin, Jose A. Bellido, Corinne Berat, Mario E. Bertaina, Marta Bianciotto, Peter L. Biermann, Virginia Binet, Kathrin Bismark, Teresa Bister, Jonathan Biteau, Jiri Blazek, Johannes Blümer, Martina Bohacova, Denise Boncioli, Carla Bonifazi, Luan Bonneau Arbeletche, Nataliia Borodai, Jeffrey Brack, P. Gabriel Brichetto 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, Jorge Caraça-Valente, Rossella Caruso, Antonella Castellina, Fernando Catalani, Gabriella Cataldi, Lorenzo Cazon, Marcos Cerda, Berenika Čermáková, Alessandro Cermenati, Jose Augusto Chinellato, Jiří Chudoba, Ladislav Chytka, Roger W Clay, Agustín Cobos Cerutti, Roberta Colalillo, 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, Beatriz de Errico, Joaquín de Jesús, Sijbrand J. de Jong, João 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, Nikolas Denner, Luca Deval, Armando di Matteo, Carola Dobrigkeit, Juan Carlos D'Olivo, Luis Miguel Domingues Mendes, Qader Dorosti, 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, Glennys R. Farrar, Anderson Fauth, Tim Fehler, Fridtjof Feldbusch, Alexandra Fernandes, Brian Fick, Juan Manuel Figueira, Paul Filip, Andrej Filipcic, Thomas Fitoussi, Benjamin Flaggs, Tomáš Fodran, Milton Freitas, Alan Fuster, Cristina Galea, Beatriz Garcia, Chloé Gaudu, Piera Luisa Ghia, Ugo GIACCARI, Fabian Gobbi, Fernando Gollan, Geraldina Golup, Mariano Gómez Berisso, Primo F. Gómez Vitale, Juan Pablo Gongora, Juan Manuel Gonzalez, Nicolas Martin Gonzalez, Dariusz Gora, Alessio Gorgi, Marvin Gottowik, Fausto Guarino, Germano Guedes, Eleonora Guido, Lukas Gülzow, Steffen Hahn, Petr Hamal, Matías Rolf Hampel, Patricia María Hansen, Violet M. Harvey, Andreas Haungs, Thomas Hebbeker, Carlos Hojvat, Jörg Hörandel, Pavel Horvath, Miroslav Hrabovsky, Tim Huege, Antonio Insolia, Paula Gina Isar, Petr Janecek, Vlastimil Jilek, Karl-Heinz Kampert, Bianca Keilhauer, Abha Khakurdikar, Varada Varma Kizakke Covilakam, Hans Klages, Matthias Kleifges, Jelena Köhler, Frederik Krieger, Margita Kubátová, Norbert Kunka, Bruno L. Lago, Niklas Langner, Marcelo Augusto Leigui de Oliveira, Yago Lema-Capeans, Antoine Letessier-Selvon, Isabelle Lhenry-Yvon, Luis LOPES, Allan Machado Payeras, Manuela Mallamaci, Dusan Mandat, Bradley C. Manning, Paul Mantsch, Federico Maria Mariani, Analisa Gabriela Mariazzi, Ioana Codrina Maris, Giovanni Marsella, Daniele Martello, Sara Martinelli, Oscar Martínez Bravo, Miguel A. Martins, Hermann-Josef Mathes, James Matthews, Giorgio Matthiae, Eric William Mayotte, Sonja Mayotte, Peter Mazur, Gustavo Medina-Tanco, Janning Meinert, Diego Melo, Alexander Menshikov, Carmen Merx, Stanislav Michal, Maria Isabel Micheletti, Lino Miramonti, Megha Mogarkar, Silvia Mollerach, François Montanet, Leonel Morejon, Katharine Mulrey, Roberto Mussa, Wilson M. Namasaka, Shefali Negi, Lukas Nellen, Khoa Nguyen, Gabriela Nicora, Marcus Niechciol, Dave Nitz, Dalibor Nosek, Alexander Novikov, Vladimír Novotný, Libor Nozka, Achille Nucita, Luis A. Nunez, José Ochoa, Cainã Oliveira, Leo Östman, Miroslav Palatka, Juan Pallotta, Shayoni Panja, Gonzalo Parente, Therese Paulsen, Jannis Pawlowsky, Miroslav Pech, Jan Pękala, Rodrigo Pelayo, Vincent Pelgrims, Luiz Augusto Pereira, Edyvania Emily Pereira Martins, Carmina Pérez Bertolli, Lorenzo Perrone, Sergio Petrera, Camilla Petrucci, Tanguy Pierog, Mário Pimenta, Manuel Platino, Bjarni Pont, Mohsen Pourmohammad Shahvar, Paolo Privitera, Michael Prouza, Krzysztof Pytel, Sven Querchfeld, Julian Rautenberg, Diego Ravignani, João Vitor Reginatto Akim, Alex Reuzki, Jan Ridky, Felix Riehn, Markus Risse, Vincenzo Rizi, Ezequiel Rodriguez, Gonzalo Rodriguez Fernandez, Jorge Rubén Rodriguez Rojo, Matías J. Roncoroni, Simone Rossoni, Markus Roth, Esteban Roulet, Adrian Rovero, Alexandra Saftoiu, Mohit Saharan, Francesco Salamida, Humberto Ibarguen Salazar, Gaetano Salina, Pranav Sampathkumar, Nicolas San Martin, Jose Sanabria Gomez, Federico Andrés Sánchez, Edivaldo Moura Santos, Eva Santos, Fred Sarazin, Raul Sarmento, Ricardo Sato, Pierpaolo Savina, Christoph M. Schäfer, Viviana Scherini, Harald Schieler, Martin Schimassek, Michael Schimp, David Schmidt, Olaf Scholten, Harm Schoorlemmer, Petr Schovanek, Frank G. Schröder, Josina Schulte, Tobias Schulz, Sergio J Sciutto, Marina Scornavacche, Adrian Sedoski, Alberto Segreto, Srijan Sehgal, Shima Ujjani Shivashankara, Guenter Sigl, Katarína Simkova, Frank Simon, Radomir Smida, Paul Sommers, Ruben Squartini, Maximilian Stadelmaier, Samo Stanič, Jaroslaw Stasielak, Patrick Stassi, Simon Strähnz, Maximilian Straub, Tiina Suomijarvi, A. Daniel Supanitsky, Zuzana Svozilikova, Zbigniew Szadkowski, Fedor Tairli, Alex Tapia, Carla Taricco, Charles Timmermans, Olena Tkachenko, Petr Tobiska, Carlos J. Todero Peixoto, Bernardo Tomé, Andres Travaini, Petr Travnicek, Matias Jorge Tueros, Michael Unger, Rukije Uzeiroska, Lukáš Vaclavek, Martin Vacula, Igor Vaiman, Jose F. Valdés Galicia, Laura Valore, Enrique Varela, Veronica Vasickova, Adriana Vásquez-Ramírez, Darko Veberic, Indira D. Vergara Quispe, Stef Verpoest, Valerio Verzi, Jakub Vicha, Jacco Vink, Serguei Vorobiov, Clara Keiko Oliveira Watanabe, Alan Watson, Andreas Weindl, Melanie Weitz, Lawrence Wiencke, Henryk Wilczyński, David Wittkowski, Brian Wundheiler, Baobiao Yue, Alexey Yushkov, Enrique Zas, Danilo Zavrtanik, Marko Zavrtanik, Rasha Abbasi, Tareq Abu-Zayyad, Monica Allen, John Belz, Douglas Bergman, Isaac Buckland, William Campbell, ByungGu Cheon, Kohei Endo, Anatoli Fedynitch, Toshihiro Fujii, Kozo Fujisue, Keitaro Fujita, Masaki Fukushima, Greg Furlich, Zane Gerber, Noémie Globus, William Hanlon, Hayashida, Haoning He, Hibino, Ryo Higuchi, Daisuke Ikeda, Ishii, Dmitri Ivanov, Soomin Jeong, Charlie Jui, Kadota, Kakimoto, Oleg Kalashev, Katsuaki Kasahara, Yusuke Kawachi, Kazumasa Kawata, Ivan Kharuk, Eiji Kido, HangBae Kim, Jihee Kim, Jihyun Kim, Sangwoo Kim, Ryuichi Kobo, Ichiro Komae, Koichi Komatsu, Kohei Komori, Chisato Koyama, Mariia Kudenko, Miu Kuroiwa, Yuki Kusumori, Mikhail Kuznetsov, Youngjoon Kwon, KwanHoon Lee, MyeongJae Lee, Bayarto Lubsandorzhiev, Jon Paul Lundquist, Aoi Matsuzawa, John Matthews, Kota Mizuno, Mizuki Mori, Miyato Murakami, Shigehiro Nagataki, Miku Nakahara, Nakamura, Tsubasa Nakayama, Yuya Nakayama, Toshiyuki Nonaka, Shoichi Ogio, Hideyuki Ohoka, Nao Okazaki, Munehiro Onishi, Oshima, Hitoshi Oshima, Ozawa, Il Hung Park, KyeongYun Park, Matt Potts, Marika Przybylak, Maxim Pshirkov, Jackson Remington, Carsten Rott, Dongsu Ryu, Hiroyuki Sagawa, Naoto Sakaki, Ryunosuke Sakamoto, Takashi Sako, Noboyuki Sakurai, Shunsuke Sakurai, Daiki Sato, Shoma Sato, Koichi Sekino, Tatsunobu Shibata, Jun Shikita, Hideaki Shimodaira, Bokkyun Shin, Heungsu Shin, Kenji Shinozaki, Jeremy Smith, Pierre Sokolsky, Ben Stokes, Tom Stroman, Yutaro Takagi, Kaoru Takahashi, Masahiro Takeda, Ryuji Takeishi, Taketa, Masato Takita, Yuichiro Tameda, Akimichi Tanaka, Tanaka, Stanton Thomas, Gordon Thomson, Petr Tinyakov, Igor Tkachev, Takayuki Tomida, Sergey Troitsky, Yoshiki Tsunesada, Shigeharu Udo, Federico Urban, Michal Vrábel, Donald Warren, Katsuya Yamazaki, Yana Zhezher, Zach Zundel, Jamie Zvirzdin
Institutions: Pierre Auger Observatory, Institute for Nuclear Research
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
OpenAlex ID: W4409942522