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arXiv 2007.05219astro-ph.HE
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一般质量四极矩大质量黑洞周围毫秒脉冲星的轨道自旋动力学

Orbital spin dynamics of a millisecond pulsar around a massive black hole with an general mass quadrupole

Tom Kimpson, Kinwah Wu, Silvia Zane

摘要:

本文研究了一颗毫秒脉冲星(MSP)在一个具有一般质量四极矩的类克尔大质量黑洞周围的紧凑轨道上的自旋动力学。我们使用Mathisson-Papetrou-Dixon公式来计算MSP的轨道和自旋演化,考虑了脉冲星能量动量张量对背景时空度规的非线性相互作用。我们研究了MSP自旋和BH四极矩在脉冲星自旋轨道动力学中的表现。我们讨论的天体物理观测的影响,这些自旋和轨道动力学的射电脉冲星的时间在一个极端的质量比二进制,例如银河系中心脉冲星。特别是,显着的爱因斯坦延迟和罗默延迟的时间变化进行了观察,随着修改脉冲星脉冲轮廓。

英文摘要:

We investigate the spin dynamics of a millisecond pulsar (MSP) in compact orbit around a Kerr-like massive black hole with an general mass quadrupole. We use the Mathisson-Papetrou-Dixon formulation to compute the orbital and spin evolution of the MSP, accounting for the non-linear interaction of the pulsar's energy-momentum tensor on the background spacetime metric. We investigate how the MSP spin and BH quadrupole moment manifest in the pulsar spin-orbital dynamics. We discuss the astrophysical observational implications of these spin and orbital dynamics on the timing of a radio pulsar in an Extreme Mass Ratio Binary, e.g. a Galactic Centre pulsar. In particular, notable timing variations in the Einstein delay and Roemer delay are observed, along with modifications to the pulsar pulse profile.

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