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Title:
The Broadband Spectrum of Galaxy Clusters
Authors:
Wolfe, Brandon; Melia, Fulvio
Affiliation:
AA(Physics Department, University of Arizona, Tucson, AZ 85721.), AB(Physics Department, University of Arizona, Tucson, AZ 85721.; Steward Observatory, University of Arizona, Tucson, AZ 85721.)
Publication:
The Astrophysical Journal, Volume 675, Issue 1, pp. 156-162. (ApJ Homepage)
Publication Date:
03/2008
Origin:
UCP
ApJ Keywords:
Acceleration of Particles, Galaxies: Clusters: Individual: Name: Coma, Plasmas, Radiation Mechanisms: Nonthermal, Relativity, X-Rays: Galaxies
DOI:
10.1086/527406
Bibliographic Code:
2008ApJ...675..156W

Abstract

We examine whether nonthermal protons energized during a cluster merger are simultaneously responsible for the Coma cluster's diffuse radio flux (via secondary decay) and the departure of its intracluster medium (ICM) from a thermal profile via Coulomb collisions between the quasi-thermal electrons and the hadrons. Rather than approximating the influence of nonthermal proton/thermal electron collisions as extremely rare events which cause an injection of nonthermal, power-law electrons (the knock-on approximation), we self-consistently solve (to our knowledge, for the first time) the covariant kinetic equations for the two populations. The electron population resulting from these collisions is out of equilibrium, yet not a power law, and importantly displays a higher bremsstrahlung radiative efficiency than a pure power law. Observations with GLAST will test this model directly.
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