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arXiv 1901.06809astro-ph.COastro-ph.HE
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原始黑洞引起的Sunyaev-Zel'dovich各向异性

Sunyaev-Zel'dovich anisotropy due to Primordial black holes

Katsuya T. Abe, Hiroyuki Tashiro, Toshiyuki Tanaka

摘要:

研究了原初黑洞(PBH)对宇宙微波背景(CMB)温度涨落的Sunyaev-Zel'dovich(SZ)效应.吸积在PBH上的气体由于引力能的释放而变热。结果,PBH附近的加热气体发射UV和X射线光子。这些光子可以加热和加热PBH周围的星系际介质(IGM)。假设这些发射光子的简单模型,我们计算IGM电离分数和PBH周围的温度的轮廓。使用这些配置文件,我们评估的康普顿$y$参数创建的IGM气体周围的PBH。最后,我们估计的CMB温度角功率谱由于PBH SZ效应在我们的模型。我们发现,SZ温度各向异性由于PBH具有平坦的角功率谱在小尺度上,$l\leq2000$,并可能主导原始温度谱在更小的尺度比丝绸尺度。这种平坦的光谱通过PBH发射扩展到电离区的尺度。我们还讨论了小规模CMB测量对PBH丰度的影响。

英文摘要:

We investigate the Sunyaev-Zel'dovich (SZ) effect caused by primordial black holes (PBHs) on the cosmic microwave background (CMB) temperature fluctuations. The gas accreting on a PBH heats up by the release of the gravitational energy. As a result, the heated gas in the vicinity of the PBH emits the UV and X-ray photons. These photons can ionize and heat the intergalactic medium (IGM) around the PBH. Assuming the simple model of these emitting photons, we compute the profiles of the IGM ionization fraction and temperature around a PBH. Using these profiles, we evaluate the Compton $y$-parameter created by the IGM gas around a PBH. Finally, we estimate the CMB temperature angular power spectrum due to the PBH SZ effect in our model. We show that the SZ temperature anisotropy due to the PBHs has the flat angular power spectrum on small scale, $l\leq2000$ and could dominate the primordial temperature spectrum on smaller scales than the Silk scale. This flat spectrum extends to the scale of the ionized region by the PBH emission. We also discuss the impact of the small-scale CMB measurement on the PBH abundance based on our results.

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