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arXiv 2109.05035astro-ph.CO
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超大质量黑洞周围原初起源的核合成信号

Nucleosynthetic signatures of primordial origin around supermassive black holes

Phoebe Upton Sanderbeck, Simeon Bird, Zoltan Haiman

摘要:

如果原初黑洞(PBH)在高红移类星体的中心播下了超大质量黑洞(SMBH)的种子,那么这些黑洞周围的气体可能揭示了它们原初起源的核合成线索。我们提出的预测改变原始丰度周围的PBH足够大的种子SMBH在z~6-7.5。我们发现,如果初始质量为~10^5 M $_{\odot}$的多环芳烃是造成这种SMBH的原因,那么它们可能会产生原始氘和氦的分数增加>~ 10%,而锂的丰度减少>~ 10%,在离黑洞约1千秒差距的距离上。我们估计,约10^8 M $_{\odot}$的气体至少增加(或减少)了1%。这些修改原始氘,氦,锂丰度的证据可能仍然存在,如果这种circu-PBH气体仍然没有吸积的SMBH和在或附近的宿主星系的高红移类星体。测量丰度异常将具有挑战性,但可以提供一种新的方法来揭示这种SMBH种子的原始起源。

英文摘要:

If primordial black holes (PBHs) seeded the supermassive black holes (SMBHs) at the centers of high-redshift quasars, then the gas surrounding these black holes may reveal nucleosynthetic clues to their primordial origins. We present predictions of altered primordial abundances around PBHs massive enough to seed SMBHs at z~6-7.5. We find that if PBHs with initial masses of ~10^5 M$_{\odot}$ are responsible for such SMBHs, they may produce primordial Deuterium and Helium fractions enhanced by >~ 10%, and Lithium abundance depleted by >~10%, at distances of up to ~ a comoving kiloparsec away from the black hole after decoupling. We estimate that ~ 10^8 M$_{\odot}$ of gas is enhanced (or depleted) by at least one percent. Evidence of these modified primordial Deuterium, Helium, and Lithium abundances could still be present if this circum-PBH gas remains unaccreted by the SMBH and in or near the host galaxies of high-redshift quasars. Measuring the abundance anomalies will be challenging, but could offer a novel way to reveal the primordial origin of such SMBH seeds.

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