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The Centaurus A Ultrahigh-energy Cosmic-Ray Excess and the Local Extragalactic Magnetic Field

Yüksel, Hasan and Stanev, Todor and Kistler, Matthew D. and Kronberg, Phillipp P. (2012) The Centaurus A Ultrahigh-energy Cosmic-Ray Excess and the Local Extragalactic Magnetic Field. Astrophysical Journal, 758 (1). Art. No. 16. ISSN 0004-637X. doi:10.1088/0004-637X/758/1/16.

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The ultrahigh-energy cosmic-ray (UHECR) anisotropies discovered by the Pierre Auger Observatory provide the potential to finally address both the particle origins and properties of the nearby extragalactic magnetic field (EGMF). We examine the implications of the excess of ~10^(20) eV events around the nearby radio galaxy Centaurus A. We find that, if Cen A is the source of these cosmic rays, the angular distribution of events constrains the EGMF strength within several Mpc of the Milky Way to ≳ 20 nG for an assumed primary proton composition. Our conclusions suggest that either the observed excess is a statistical anomaly or the local EGMF is stronger than conventionally thought. We discuss several implications, including UHECR scattering from more distant sources, time delays from transient sources, and the possibility of using magnetic lensing signatures to attain tighter constraints.

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Additional Information:© 2012 American Astronomical Society. Received 2012 March 28; accepted 2012 August 3; published 2012 September 20. We thank Stirling Colgate, Dan Holz, Hui Li, and especially Matteo Murgia for discussions and comments. H.Y. is supported by the LANL LDRD program, T.S. is supported by DOE Grant DE-FG02-91ER40626, M.D.K. acknowledges support provided by NASA through the Einstein Fellowship Program, grant PF0-110074, and P.P.K. acknowledges support from an NSERC (Canada) Discovery Grant A5713.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-91ER40626
NASA Einstein Fellowship ProgramPF0-110074
Natural Sciences and Engineering Research Council of Canada (NSERC)A5713
Subject Keywords:cosmic rays; galaxies: magnetic fields; ISM: magnetic fields
Issue or Number:1
Record Number:CaltechAUTHORS:20121108-113603320
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Official Citation:The Centaurus A Ultrahigh-energy Cosmic-Ray Excess and the Local Extragalactic Magnetic Field Hasan Yüksel et al. 2012 ApJ 758 16
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35365
Deposited By: Ruth Sustaita
Deposited On:09 Nov 2012 18:19
Last Modified:09 Nov 2021 23:14

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