A composition-informed search for large-scale anisotropy with the Pierre Auger Observatory
The large-scale dipolar structure in the arrival directions of ultra-high-energy cosmic rays with energies above $8\,$EeV observed by the Pierre Auger Collaboration is a well-established anisotropy measurement. This anisotropy is understood to be of extragalactic origin, as the maximum of the dipolar component is located ${\sim}115^\circ$ away from the Galactic Center. Cosmic rays interact with background radiation and magnetized regions on their path from their sources to Earth. These interactions, which depend on the cosmic-ray energy, charge and mass composition, give rise to different horizons and deflections that are expected to lead to different anisotropies in the arrival directions of cosmic rays at Earth. The Auger Collaboration has determined that the mass composition of cosmic rays at ultra-high energies is mixed, becoming increasingly heavier as a function of energy. Thus, different dipole amplitudes are expected to be measured at a given energy when separating the data into composition-distinct subsets of lighter and heavier elements. In this contribution, we investigate the composition signature on the large-scale anisotropy taking advantage of composition estimators obtained from the data gathered with the surface detector. A way of probing for composition signatures in anisotropy patterns is then to divide the data into subsets of ``lighter'' and ``heavier'' elements per energy bin. In a simulation library, we evaluate the possibility of measuring a separation in total dipole amplitude between two such populations of the measured dataset under a source-agnostic model. We present the results using two different composition estimators, one based on air-shower universality and one inferred with deep learning.
Authors
- Belén Andrada
- Zbigniew Szadkowski (ORCID: https://orcid.org/0000-0002-2690-9912)
- Bruno L. Lago (ORCID: https://orcid.org/0000-0001-9672-0499)
- Carla Taricco (ORCID: https://orcid.org/0000-0002-0129-5539)
- Giovanni Consolati (ORCID: https://orcid.org/0000-0003-3614-245X)
- Juan Manuel Gonzalez (ORCID: https://orcid.org/0000-0001-9193-0921)
- S. Petrera (ORCID: https://orcid.org/0000-0002-6029-1255)
- Varada Varma Kizakke Covilakam (ORCID: https://orcid.org/0000-0001-5278-3172)
- T. Pierog (ORCID: https://orcid.org/0000-0002-7472-8710)
- G. Sigl (ORCID: https://orcid.org/0000-0002-4396-645X)
- Mateo Fernandez
- T. Huege (ORCID: https://orcid.org/0000-0002-2783-4772)
- Marta Bianciotto (ORCID: https://orcid.org/0000-0002-9599-3214)
- Nicolas Leal
- Carmina Pérez Bertolli (ORCID: https://orcid.org/0000-0002-9790-5732)
- Carlo Salvattore Cruz Sanchez (ORCID: https://orcid.org/0009-0002-6173-0974)
- Frank Schröder (ORCID: https://orcid.org/0000-0001-8495-7210)
- A. Bueno (ORCID: https://orcid.org/0000-0002-7439-4247)
- Gustavo Medina‐Tanco (ORCID: https://orcid.org/0000-0002-3202-319X)
- A. C. Fauth (ORCID: https://orcid.org/0000-0001-7239-0288)
- Enrico Arnone (ORCID: https://orcid.org/0000-0001-6740-5051)
- Enrique Varela (ORCID: https://orcid.org/0000-0003-0715-7513)
- O. Schölten (ORCID: https://orcid.org/0000-0003-3649-1254)
- Lorenzo Cazon (ORCID: https://orcid.org/0000-0001-6748-8395)
- B. R. Dawson (ORCID: https://orcid.org/0000-0002-4271-3055)
- Laura Valore
- A. Haungs (ORCID: https://orcid.org/0000-0002-9638-7574)
- Harm Schoorlemmer (ORCID: https://orcid.org/0000-0002-8999-9249)
- Dalibor Nosek (ORCID: https://orcid.org/0000-0001-6219-200X)
- G. Parente (ORCID: https://orcid.org/0000-0003-2847-0461)
- Paula Gina Isar (ORCID: https://orcid.org/0000-0002-1241-584X)
- Janning Meinert (ORCID: https://orcid.org/0000-0001-7582-3456)
- Emanuele De Vito (ORCID: https://orcid.org/0000-0003-2045-7588)
- M. Roth (ORCID: https://orcid.org/0000-0003-1281-4477)
- Adila Abdul Halim (ORCID: https://orcid.org/0000-0003-1218-1737)
- Gonzalo Rodriguez Fernandez (ORCID: https://orcid.org/0000-0002-4683-230X)
- Jiří Blažek (ORCID: https://orcid.org/0000-0002-5870-8947)
- Therese Paulsen
- Adriel Bartz Mocellin
- Berenika Čermáková
- S. J. de Jong (ORCID: https://orcid.org/0000-0002-3120-3367)
- V. Rizi (ORCID: https://orcid.org/0000-0002-5277-6527)
- Armando di Matteo (ORCID: https://orcid.org/0000-0002-8260-1867)
- Alexey Yushkov (ORCID: https://orcid.org/0000-0001-5107-9116)
- K. Daumiller (ORCID: https://orcid.org/0000-0002-0527-4823)
- A. Insolia (ORCID: https://orcid.org/0000-0002-9040-1566)
- Lorenzo Caccianiga (ORCID: https://orcid.org/0000-0002-2245-5108)
- Darko Veberič (ORCID: https://orcid.org/0000-0003-2683-1526)
- María Isabel Micheletti (ORCID: https://orcid.org/0000-0002-1063-9938)
- A. Segreto (ORCID: https://orcid.org/0000-0001-7341-6603)
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- Viviana Scherini (ORCID: https://orcid.org/0000-0003-3762-4063)
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- M. Cristinziani (ORCID: https://orcid.org/0000-0003-3893-9171)
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- Clara Keiko Oliveira Watanabe
- Roberta Colalillo (ORCID: https://orcid.org/0000-0002-4179-9352)
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- A. D. Supanitsky (ORCID: https://orcid.org/0000-0002-6942-6216)
- Pedro J. Costa
- Maximilian Straub
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- Federico Maria Mariani
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- Shima Ujjani Shivashankara
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- Peter L. Biermann (ORCID: https://orcid.org/0000-0003-3948-6143)
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- Carmen Merx
- Mohsen Pourmohammad Shahvar
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- C. Dobrigkeit
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- Joao dos Anjos
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- Matías Rolf Hampel
- Veronika Vašíčková
- Alexandra Fernandes (ORCID: https://orcid.org/0000-0002-9187-4007)
- Ugo GIACCARI
- Luiz Augusto Pereira
- Sara Martinelli
- Geraldina Golup
- Matteo Conte
- Ezequiel Rodríguez
- Jaime de Oliveira
- Jannis Pawlowsky
- Danelise de Oliveira Franco
- Juan Manuel Figueira
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- Luis Miguel Domingues Mendes
- Frederik Krieger
- Gael Flores Avila (ORCID: https://orcid.org/0000-0001-8375-6492)
- Sven Querchfeld
- Matthias Kleifges
- Samo Stanič
- Luciana Andrade Dourado
- Petr Schovánek (ORCID: https://orcid.org/0000-0002-5344-7645)
- Tomáš Fodran (ORCID: https://orcid.org/0009-0000-9529-0853)
- Matias Jorge Tueros (ORCID: https://orcid.org/0000-0003-1570-1419)
- D. Ravignani (ORCID: https://orcid.org/0000-0001-7410-8522)
- G. Cataldi (ORCID: https://orcid.org/0000-0001-8066-7718)
- Megha Mogarkar
- Jhansi Bhavani Vuta
- Eric-Teunis de Boone
- Mohamed Ismaiel
- Karolina Syrokvas
- Matteo Tambone
- Pim van Dillen
Publication Details
- Published
- 2025-09-23
- DOI
- https://doi.org/10.22323/1.501.0272
- Primary Topic
- Astronomy and Astrophysical Research
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- U.S. Department of Energy
- Grainger Foundation
- Strong
- Ministerul Cercetării, Inovării şi Digitalizării
- European Commission
- Consejo Nacional de Investigaciones Científicas y Técnicas
- Javna Agencija za Raziskovalno Dejavnost RS
- Ministerio de Ciencia e Innovación
- Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii
- Xunta de Galicia
- Junta de Andalucía
- Fundação para a Ciência e a Tecnologia
- Agencia Nacional de Promoción Científica y Tecnológica
- European Regional Development Fund
- Agencia Estatal de Investigación