Excess astrophysical photons from a 0.1-1 keV cosmic axion background.
Excess astrophysical photons from a 0.1-1 keV cosmic axion background.
复制标题
来自 0.1-1 keV 宇宙轴子背景的过量天体物理光子。
DOI:
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发表时间:
2013
影响因子:
8.6
通讯作者:
M. C. D. Marsh
中科院分区:
文献类型:
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作者:
Joseph P. Conlon;M. C. D. Marsh
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.