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arXiv 2303.02172astro-ph.HEastro-ph.GA
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活动星系核中恒星质量黑洞的可观测特征

Observable signatures of stellar-mass black holes in active galactic nuclei

Hiromichi Tagawa, Shigeo S. Kimura, Zoltán Haiman, Rosalba Perna, Imre Bartos

摘要:

恒星质量的黑洞(BH)由于引力拖曳和原位恒星形成的作用,被预测嵌入活动星系核(AGN)的盘中。然而,目前缺乏活动星系核盘嵌入黑洞的明确证据。在这里,作为可能的电磁签名,这些黑洞,我们调查爆发发射的冲击周围的布兰德福德Znajek喷气机从吸积黑洞在AGN磁盘。我们假设,大多数的高度超爱丁顿流到达BH,产生一个强大的射流,射流产生反馈,关闭吸积,从而导致幕式耀斑。虽然这些假设目前还很不确定,但它们预测了一种爆发发射,其特征是X射线波段的发光热发射,以及从红外到伽马射线波段的明亮宽带非热发射。耀斑的持续时间取决于黑洞到中心超大质量黑洞的距离$r$,对于$r \sim 0.01-1$ pc,$10^3-10^6$ s之间变化。这种辐射可以通过当前和未来的红外、光学和X射线宽场调查以及对附近活动星系核的监测活动来发现。

英文摘要:

Stellar-mass black holes (BHs) are predicted to be embedded in the disks of active galactic nuclei (AGN) due to gravitational drag and in-situ star formation. However, clear evidence for AGN disk-embedded BHs is currently lacking. Here, as possible electromagnetic signatures of these BHs, we investigate breakout emission from shocks emerging around Blandford-Znajek jets launched from accreting BHs in AGN disks. We assume that the majority of the highly super-Eddington flow reaches the BH, produces a strong jet, and the jet produces feedback that shuts off accretion and thus leads to episodic flaring. While these assumptions are highly uncertain at present, they predict a breakout emission characterized by luminous thermal emission in the X-ray bands, and bright, broadband non-thermal emission from the infrared to the gamma-ray bands. The flare duration depends on the BH's distance $r$ from the central supermassive BH, varying between $10^3-10^6$ s for $r \sim 0.01-1$ pc. This emission can be discovered by current and future infrared, optical, and X-ray wide-field surveys and monitoring campaigns of nearby AGNs.

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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