Excess astrophysical photons from a 0.1-1 keV cosmic axion background.

Excess astrophysical photons from a 0.1-1 keV cosmic axion background.
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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
M. C. D. Marsh
中科院分区:
物理与天体物理1区
文献类型:
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作者:
Joseph P. Conlon;M. C. D. Marsh

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z~10(12)处弦理论模的原始衰变自然产生能量为0.1-1 keV的暗辐射宇宙轴子背景。这种宇宙轴子背景可以通过天体物理磁场中的轴子-光子转换来检测,从而在极紫外和软x射线波段产生准热过剩。即使轴子-光子耦合<<10(-11)GeV(-1),也可以产生可观的亮度。我们认为轴子-光子转换可以解释观测到的星系团中软x射线的过量发射,也可能有助于扩散未解决的宇宙x射线背景。我们列出了一些相关的预测的情况。
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.