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arXiv 1004.4833astro-ph.COgr-qc
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恒星瞬发潮汐破裂作为超大质量黑洞并合的电磁特征

Prompt Tidal Disruption of Stars as an Electromagnetic Signature of Supermassive Black Hole Coalescence

Nicholas Stone, Abraham Loeb

摘要:

对合并黑洞双星的天球坐标和红移进行精确的电磁测量是利用其引力波(GW)信号约束宇宙学参数和检验广义相对论的关键。在这里,我们表明,合并后的~10^{6-7}M_太阳黑洞一般是由多个电磁耀斑从潮汐破裂的恒星在一段时间内。GW辐射对合并后的黑洞的突然反冲迅速填满了它的损失锥,导致恒星的潮汐破裂率高达每年0.1。在一个单一的星系内的恒星在短时间内迅速中断提供了一个独特的电磁标志最近的一个黑洞合并事件,和连续中断可以用来校准脉冲星定时阵列或拟议的激光干涉仪空间天线(LISA)的GW源的预期速率。

英文摘要:

A precise electromagnetic measurement of the sky coordinates and redshift of a coalescing black hole binary holds the key for using its gravitational wave (GW) signal to constrain cosmological parameters and to test general relativity. Here we show that the merger of ~10^{6-7}M_sun black holes is generically followed over a period of years by multiple electromagnetic flares from tidally disrupted stars. The sudden recoil imparted to the merged black hole by GW emission promptly fills its loss cone and results in a tidal disruption rate of stars as high as ~0.1 per year. The prompt disruption of a star within a single galaxy over a short period provides a unique electromagnetic flag of a recent black hole coalescence event, and sequential disruptions could be used on their own to calibrate the expected rate of GW sources for pulsar timing arrays or the proposed Laser Interferometer Space Antenna (LISA).

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