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arXiv 2108.01916astro-ph.COgr-qchep-ph
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从吸积的原始黑洞中释放-释放background radiation

Free-free background radiation from accreting primordial black holes

Hiroyuki Tashiro, Katsuya T. Abe, Teppei Minoda

摘要:

重子气体落在原初黑洞(PBH)上,通过自由-自由过程发射光子。这些光子在宇宙微波背景辐射(CMB)的频率范围内可以贡献漫射的自由-自由背景辐射。结果表明,PBH的自由-自由背景辐射强度与PBH的质量和丰度有关。特别地,考虑到由非PBH DM粒子引起的PBH周围的暗物质(DM)晕的生长强烈地增强了自由-自由背景辐射。大的PBH分数增加了自由-自由发射的信号。然而,大的PBH分数也可以加热IGM气体,从而抑制吸积速率。结果,当PBH分数大于0.1时,自由-自由发射降低。我们发现PBH在CMB和射频中的自由-自由发射远低于CMB黑体谱和背景辐射中观测到的自由-自由发射分量。因此,很难从自由-自由发射观测中获得约束。然而,对宇宙起源的自由-自由辐射的进一步理论理解和观测有助于研究PBH丰度随恒星质量的变化。

英文摘要:

Baryonic gas falling onto a primordial black hole (PBH) emits photons via the free-free process. These photons can contribute the diffuse free-free background radiation in the frequency range of the cosmic microwave background radiation (CMB). We show that the intensity of the free-free background radiation from PBHs depends on the mass and abundance of PBHs. In particular, considering the growth of a dark matter (DM) halo around a PBH by non-PBH DM particles strongly enhances the free-free background radiation. Large PBH fraction increase the signal of the free-free emission. However, large PBH fraction also can heat the IGM gas and, accordingly, suppresses the accretion rate. As a result, the free-free emission decreases when the PBH fraction is larger than 0.1. We find that the free-free emission from PBHs in the CMB and radio frequency is much lower than the CMB blackbody spectrum and the observed free-free emission component in the background radiation. Therefore, it is difficult to obtain the constraint from the free-free emission observation. However further theoretical understanding and observation on the free-free emission from cosmological origin is helpful to study the PBH abundance with the stellar mass.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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