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Proceedings Paper

Anisotropies and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory

Publicated to:Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011. 2 137-140 - 2011-01-01 2(), DOI: 10.7529/ICRC2011/V02/0868

Authors: Abreu P; Aglietta M; Ahn EJ; Albuquerque IFM; Allard D; Allekotte I; Allen J; Allison P; Alvarez Castillo J; Alvarez-Muñiz J; Ambrosio M; Aminaei A; Anchordoqui L; Andringa S; Anticic T; Anzalone A; Aramo C; Arganda E; Arqueros F; Asorey H; Assis P; Aublin J; Ave M; Avenier M; Avila G; Bäcker T; Balzer M; Barber KB; Barbosa AF; Bardenet R; Barroso SLC; Baughman B; Bäuml J; Beatty JJ; Becker BR; Becker KH; Bellétoile A; Bellido JA; BenZvi S; Berat C; Bertou X; Biermann PL; Billoir P; Blanco F; Blanco M; Bleve C; Blümer H; Bohácová M; Boncioli D; Bonifazi C; Bonino R; Borodai N; Brack J; Brogueira P; Brown WC; Bruijn R; Buchholz P; Bueno A; Burton RE; Caballero-Mora KS; Caramete L; Caruso R; Castellina A; Catalano O; Cataldi G; Cazon L; Cester R; Chauvin J; Cheng SH; Chiavassa A; Chinellato JA; Chou A; Chudoba J; Clay RW; Coluccia MR; Conceição R; Contreras F; Cook H; Cooper MJ; Coppens J; Cordier A; Cotti U; Coutu S; Covault CE; Creusot A; Criss A; Cronin J; Curutiu A; Dagoret-Campagne S; Dallier R; Dasso S; Daumiller K; Dawson BR; De Almeida RM; De Domenico M; De Donato C; De Jong SJ; De La Vega G; De Mello WJM; De Mello Neto JRT

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Abstract

The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies E > Eth = 5.5×1019 eV. These show a correlation with the distribution of nearby extragalactic objects, including an apparent excess around the direction of Centaurus A. If the particles responsible for these excesses at E > Eth are heavy nuclei with charge Z, the proton component of the sources should lead to excesses in the same regions at energies E/Z. We here report the lack of anisotropies in these directions at energies above Eth/Z (for illustrative values of Z = 6, 13, 26). If the anisotropies above Eth are due to nuclei with charge Z, and under reasonable assumptions about the acceleration process, these observations imply stringent constraints on the allowed proton fraction at the lower energies.

Keywords

AnisotropiesChemical compositionPierre auger observatoryUltra-high energy cosmic rays

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011, Q4 Agency Scopus (SJR), its regional focus and specialization in Transportation, give it significant recognition in a specific niche of scientific knowledge at an international level.

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-05-28:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 34 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

    Leadership analysis of institutional authors

    This work has been carried out with international collaboration, specifically with researchers from: Argentina; Australia; Brazil; Croatia; Czech Republic; France; Germany; Italy; Mexico; Netherlands; Poland; Portugal; Slovenia; United Kingdom; United States of America.