Outflow Bubbles from Compact Binary Mergers Embedded in Active Galactic Nuclei: Cavity Formation and the Impact on Electromagnetic Counterparts
Outflow Bubbles from Compact Binary Mergers Embedded in Active Galactic Nuclei: Cavity Formation and the Impact on Electromagnetic Counterparts
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DOI：
10.3847/1538-4357/ac0535
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
S. Kimura;K. Murase;I. Bartos
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文献类型：
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作者：
S. Kimura;K. Murase;I. Bartos
我们提出了一种由活动星系核（agn）吸积盘中紧密双星合并可能产生电磁（EM）发射的新场景。agn中的核星团可能是紧凑双星（csb）的形成地点，它们的合并可以通过引力波（GWs）检测到。我们研究了嵌入AGN盘的csb的吸积和流出。我们表明，在双星合并之前，这些流出可能会在AGN盘中产生流出腔，这使得EM或中微子的对应物比预期的要少得多。我们讨论了可探测的电磁对应物在流出腔内合并的必要条件。如果合并残余黑洞经历高反冲速度并能够进入AGN盘，它可以以超爱丁顿速率吸积气体，新形成一个类似腔的结构。这个泡沫可能在合并后的一天到一周内破裂。这种爆发辐射的亮度足以被当前的软x射线仪器探测到，比如Swift-XRT和钱德拉。
We propose a novel scenario for possible electromagnetic (EM) emission by compact binary mergers in the accretion disks of active galactic nuclei (AGNs). Nuclear star clusters in AGNs are a plausible formation site of compact-stellar binaries (CSBs) whose coalescences can be detected through gravitational waves (GWs). We investigate the accretion onto and outflows from CSBs embedded in AGN disks. We show that these outflows are likely to create outflow cavities in the AGN disks before the binaries merge, which makes EM or neutrino counterparts much less common than would otherwise be expected. We discuss the necessary conditions for detectable EM counterparts to mergers inside the outflow cavities. If the merger remnant black hole experiences a high recoil velocity and can enter the AGN disk, it can accrete gas with a super-Eddington rate, newly forming a cavity-like structure. This bubble can break out of the disk within a day to a week after the merger. Such breakout emission can be bright enough to be detectable by current soft X-ray instruments, such as Swift-XRT and Chandra.