Journal article
Excess astrophysical photons from a 0.1-1 keV cosmic axion background.
- Abstract:
- Primordial decays of string theory moduli at z~10(12) naturally generate a dark radiation cosmic axion background with 0.1-1 keV energies. This cosmic axion background can be detected through axion-photon conversion in astrophysical magnetic fields to give quasithermal excesses in the extreme ultraviolet and soft x-ray bands. Substantial and observable luminosities may be generated even for axion-photon couplings <<10(-11) GeV(-1). We propose that axion-photon conversion may explain the observed excess emission of soft x rays from galaxy clusters, and may also contribute to the diffuse unresolved cosmic x-ray background. We list a number of correlated predictions of the scenario.
- Publication status:
- Published
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- Publisher copy:
- 10.1103/physrevlett.111.151301
Authors
- Journal:
- Physical Review Letters More from this journal
- Volume:
- 111
- Issue:
- 15
- Pages:
- 151301
- Publication date:
- 2013-10-01
- DOI:
- EISSN:
-
1079-7114
- ISSN:
-
0031-9007
- Language:
-
English
- Pubs id:
-
pubs:435726
- UUID:
-
uuid:0ad31336-f0bb-4dab-994c-5df3d4582cc3
- Local pid:
-
pubs:435726
- Source identifiers:
-
435726
- Deposit date:
-
2013-11-16
- ARK identifier:
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- Copyright date:
- 2013
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