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Soft X-ray Excess in the Coma Cluster from a Cosmic Axion Background

Abstract:

We show that the soft X-ray excess in the Coma cluster can be explained by a cosmic background of relativistic axions converting into photons in the cluster magnetic field. We provide a detailed self-contained review of the cluster soft X-ray excess, the proposed astrophysical explanations and the problems they face, and explain how a 0.1-1 keV axion background naturally arises at reheating in many string theory models of the early universe. We study the morphology of the soft excess by numer...

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Publication status:
Published

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Publisher:
Institute of Physics Publishing
Journal:
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume:
2014
Issue:
9
Pages:
026-026
Publication date:
2013-12-13
DOI:
EISSN:
1475-7516
ISSN:
1475-7516
URN:
uuid:175901f4-9ce3-4443-857b-819ecf196d69
Source identifiers:
464569
Local pid:
pubs:464569
Language:
English
Keywords:

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