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arXiv 2005.02053astro-ph.HE
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银河系中心脉冲星和星团的引力爆发辐射

Gravitational Burst Radiation from Pulsars in the Galactic centre and stellar clusters

Tom Kimpson, Kinwah Wu, Silvia Zane

摘要:

围绕星系和球状星团中心的中等质量或超大质量黑洞运行的脉冲星被称为极端质量比双星,已被确定为强场GR的精确探测器。对于适当的轨道参数,其中一些系统也可能以"爆发式"模式发射引力辐射。观测这种爆发辐射与电磁无线电定时信号的结合将允许在强场引力机制中进行多信使天文学。在这项工作中,我们研究了这些PSR-EMRB的引力辐射,计算波形和信噪比,并探讨这种GW对脉冲星无线电信号的影响。我们发现,对于典型的PSR-EMRB,引力爆发辐射应从银河系中心和星团中心都可以检测到,并且这种辐射不会有意义地影响脉冲星定时信号,从而使PSR-EMRB保持强场GR的"干净"试验台。

英文摘要:

Pulsars (PSRs) orbiting intermediate or supermassive black holes at the centre of galaxies and globular clusters are known as Extreme Mass Ratio Binaries (EMRBs) and have been identified as precision probes of strong-field GR. For appropriate orbital parameters, some of these systems may also emit gravitational radiation in a `burst-like' pattern. The observation of this burst radiation in conjunction with the electromagnetic radio timing signal would allow for multimessenger astronomy in strong-field gravitational regimes. In this work we investigate gravitational radiation from these PSR-EMRBs, calculating the waveforms and SNRs and explore the influence of this GW on the pulsar radio signal. We find that for typical PSR-EMRBs, gravitational burst radiation should be detectable from both the Galactic centre and the centre of stellar clusters, and that this radiation will not meaningfully affect the pulsar timing signal, allowing PSR-EMRB to remain `clean' test-beds of strong-field GR.

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