双星黑洞合并后填充盘空：瞬态吸积余辉
Filling the disk hollow following binary black hole merger: The transient accretion afterglow
摘要：
来自双星黑洞（BHBH）的潮汐力矩清空了任何环绕双星的气体吸积盘的中心区域。潮汐力矩和粘性之间的平衡使盘的内边缘保持在半径r ~ 1.5a - 2a处，其中a是二元半长轴。最后，这对吸入的双星从盘中分离并合并，在盘中留下一个中心空洞（“甜甜圈洞”），围绕残余的黑洞旋转。我们提出了一个简单的，随时间变化的，牛顿计算，遵循长期（粘性）的磁盘的演变，因为它填补了空心的黑洞最里面的稳定的圆形轨道，然后放松到静止平衡。我们使用我们的模型来计算电磁辐射（“余辉”）在这个短暂的吸积时代发出的频谱。观察总电磁通量的时间增加和频谱的硬化，因为环形洞填充可能有助于确认引力波干涉仪检测到的BHBH合并。我们展示了如何非常存在的初始空心可以导致超爱丁顿吸积在这个长期阶段，如果率不是很远低于爱丁顿之前去耦。我们的模型，虽然高度理想化，可能是有用的，在建立一些关键参数，热发射功能和缩放的特点，这种瞬态。它可以作为指导未来的辐射磁流体动力学模拟在广义相对论的设计和校准。
英文摘要：
Tidal torques from a binary black hole (BHBH) empty out the central regions in any circumbinary gaseous accretion disk. The balance between tidal torques and viscosity maintain the inner edge of the disk at a radius r ~ 1.5a -- 2a, where a is the binary semimajor axis. Eventually, the inspiraling binary decouples from disk and merges, leaving behind a central hollow ("donut hole") in the disk orbiting the remnant black hole. We present a simple, time-dependent, Newtonian calculation that follows the secular (viscous) evolution of the disk as it fills up the hollow down to the black hole innermost stable circular orbit and then relaxes to stationary equilibrium. We use our model to calculate the electromagnetic radiation ("afterglow") spectrum emitted during this transient accretion epoch. Observing the temporal increase in the total electromagnetic flux and the hardening of the spectrum as the donut hole fills may help confirm a BHBH merger detected by a gravitational wave interferometer. We show how the very existence of the initial hollow can lead to super-Eddington accretion during this secular phase if the rate is not very far below Eddington prior to decoupling. Our model, though highly idealized, may be useful in establishing some of the key parameters, thermal emission features and scalings that characterize this transient. It can serve as a guide in the design and calibration of future radiation-magnetohydrodynamic simulations in general relativity.
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。
