论文标题
AGN积聚磁盘中的中子星合并：Cocoon和Ejecta Shock Breakouts
Neutron Star Mergers in AGN Accretion Disks: Cocoon and Ejecta Shock Breakouts
论文作者
论文摘要
据信中子恒星合并发生在超级质量黑洞周围的积聚磁盘中。在这里，我们表明，将cho住有活性银河核（AGN）磁盘中迁移陷阱中发生的二进制中子星（BNS）或中子星的合并或中子星 - 黑孔（NSBH）合并发射的推定喷气机。喷气能沉积在磁盘材料中以供电热茧。合并后，茧充满活力，足以从AGN磁盘中爆发，并产生明亮的X射线冲击突破性瞬态临时峰值，{\ rm d} $在合并后。峰值光度估计为$ \ sim 10^{46} \，{\ rm erg} \，{\ rm s}^{ - 1} $，可以由$ z \ lisssim 0.5 $从$ z \ simsim中发现。后来，从合并发射的非相关性弹射器将破坏磁盘，并在合并后以$ \ sim 0.5 \，{\ rm d} $为X射线/紫外线峰值。紫外线瞬态搜索可以检测到第二个冲击突破信号。圆盘排放量胜过茧的冷却排放和Kilonova排放，难以检测到。未来对BNS/NSBH合并引力波和相关的两个冲击突破特征的联合观察可以为AGN磁盘中紧凑的二元合并形成通道提供强有力的支持。
Neutron star mergers are believed to occur in accretion disks around supermassive black holes. Here we show that a putative jet launched from the merger of a binary neutron star (BNS) or a neutron star--black hole (NSBH) merger occurring at the migration trap in an active galactic nucleus (AGN) disk would be choked. The jet energy is deposited within the disk materials to power a hot cocoon. The cocoon is energetic enough to break out from the AGN disk and produce a bright X-ray shock breakout transient peaking at $\sim0.15\,{\rm d}$ after the merger. The peak luminosity is estimated as $\sim 10^{46}\,{\rm erg}\,{\rm s}^{-1}$, which can be discovered by Einstein Probe from $z\lesssim 0.5$. Later on, the non-relativistic ejecta launched from the merger would break out the disk, powering an X-ray/UV flare peaking at $\sim 0.5\,{\rm d}$ after the merger. This second shock breakout signal may be detected by UV transient searches. The cocoon cooling emission and kilonova emission are outshone by the disk emission and difficult to be detected. Future joint observations of gravitational waves from BNS/NSBH mergers and associated two shock breakout signatures can provide a strong support for the compact binary coalescence formation channel in AGN disks.
