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arXiv 1906.09281astro-ph.HE
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活动星系核中的分级黑洞合并

Hierarchical Black Hole Mergers in Active Galactic Nuclei

Yang Yang, Imre Bartos, V. Gayathri, Saavik Ford, Zoltan Haiman, Sergey Klimenko, Bence Kocsis, Szabolcs Márka, Zsuzsa Márka, Barry McKernan, Richard O'Shaugnessy

摘要:

LIGO/Virgo发现的恒星质量黑洞合并的起源仍然未知。在这里,我们表明,如果迁移陷阱中的活动星系核(AGN)的\add{accretion}磁盘的发展,并促进其俘虏黑洞的合并,磁盘内的大多数黑洞将进行分级合并-其中一个黑洞是残留的前一次合并。LIGO/Virgo探测到的活动星系核协助的合并中,有40%将包含一个质量为$\gtrsim 50$ M $_\odot$的黑洞,这是恒星核心坍缩的质量极限。在活动星系核的陷阱中,层级合并将显示出与双星轨道轴(反)对齐的黑洞自旋,这是与其他层级通道不同的特性。我们的结果是暗示性的,虽然不是确定的(比值比为$\sim 1$),LIGO迄今为止最重的合并,GW 170729,可能起源于这个通道。

英文摘要:

The origins of the stellar-mass black hole mergers discovered by LIGO/Virgo are still unknown. Here we show that, if migration traps develop in the \add{accretion} disks of Active Galactic Nuclei (AGNs) and promote the mergers of their captive black holes, the majority of black holes within disks will undergo hierarchical mergers---with one of the black holes being the remnant of a previous merger. 40% of AGN-assisted mergers detected by LIGO/Virgo will include a black hole with mass $\gtrsim 50$ M$_\odot$, the mass limit from stellar core collapse. Hierarchical mergers at traps in AGNs will exhibit black hole spins (anti-)aligned with the binary's orbital axis, a distinct property from other hierarchical channels. Our results are suggestive, although not definitive (with Odds ratio of $\sim 1$), that LIGO's heaviest merger so far, GW170729, could have originated from this channel.

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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