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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents



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ID: 63733.0, MPI für Kernphysik / High-Energy Astrophysics
On the non-thermal high energy radiation of galaxy clusters
Authors:Timokhin, A.N.; Aharonian, F.A.; Neronov, A. Y.
Language:English
Date of Publication (YYYY-MM-DD):2004-04-02
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:Astron. & Astrophys.
Volume:417
Issue / Number:2
Start Page:391
End Page:399
Copyright:ESO 2004
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The origin of the non-thermal EUV and hard X-ray emission "excess'' reported from some galaxy clusters has been intensively debated over the last several years. The most favored models which refer this excess to relativistic electrons upscattering the 2.7 K Cosmic Microwave Background Radiation (CMBR) generally requires a very low magnetic field, significantly below the estimates derived from the Faraday Rotation Measurements, unless one invokes rather nonstandard assumptions concerning the energy and pitch angle distributions of non-thermal electrons. In this paper we suggest a new model assuming that the "non-thermal'' excess is due to synchrotron radiation of ultra-relativistic (multi-TeV) electrons of "photonic'' origin. These electrons are continuously introduced throughout the entire intracluster medium by very high energy (hypothetical) -rays through interactions with the diffuse extragalactic radiation fields. We present numerical calculations for the Coma cluster, and briefly discuss implications of the model for other galaxy clusters both in the X- and -ray energy domains.
Free Keywords:X-rays: galaxies: clusters - galaxies: clusters: individual: Coma - gamma rays: theory
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group H. J. Völk/High Energy Astrophysics (F. Aharonian)
External Affiliations:Sternberg Astronomical Institute, Universitetskij pr. 13, Moscow, 119992, Russia
Institut de Physique Théorique, Université de Lausanne, BSP 1015 Lausanne, Switzerland
Identifiers:DOI:10.1051/0004-6361:20040004
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