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arXiv 1601.08082astro-ph.COastro-ph.HE
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M87中SMBH双星的引力波

Gravitational waves from an SMBH binary in M87

Naoyuki Yonemaru, Hiroki Kumamoto, Sachiko Kuroyanagi, Keitaro Takahashi, Joseph Silk

摘要:

本文研究了位于M87中心的一个假想的超大质量黑洞(SMBH)双星的引力波辐射。除了通常认为的活动星系核中心之外,存在着一个SMBH,这是对活动星系核与星系质心之间观测到的位移($\sim O(1)~{\rm pc}$)的一个可能的解释,并且认为SMBH的演化是通过星系合并进行的是合理的。由于双星和由此产生的GW的周期比观测时间跨度长得多,我们计算GW振幅的变化,而不是振幅本身。我们调查的轨道根数和第二BH质量的依赖性考虑到观测约束。针对脉冲星时钟阵无法探测到的低频巨波,提出了一种利用脉冲星自旋下降率分布函数探测低频巨波的新方法。虽然用新方法很难探测到解释观测到的位移的SMBH双星的GWs,但GWs仍然是探测M87中心的有用方法。

英文摘要:

In this paper, we study gravitational-wave (GW) emission from a hypothetical supermassive black-hole (SMBH) binary at the center of M87. The existence of a SMBH other than that usually identified with the central AGN is a possible explanation for the observed displacement ($\sim O(1)~{\rm pc}$) between the AGN and the galactic centroid, and it is reasonable to assume consid- ering the evolution of SMBHs through galaxy mergers. Because the period of the binary and the resulting GWs is much longer than the observational time span, we calculate the variation of the GW amplitude, rather than the amplitude itself. We investigate the dependence on the orbital elements and the second BH mass taking the observational constraints into account. The frequency of the GWs is too low to be detected with the conventional pulsar timing array and we propose a new method to detect such low-frequency GWs with the distribution func- tion of pulsar spin-down rates. Although the GWs from a SMBH binary which explains the observed displacement is extremely hard to be detected even with the new method, GWs are still a useful way to probe the M87 center.

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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