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arXiv 1807.06296astro-ph.HEastro-ph.GA
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黑洞自旋来自M87喷流的摆动和旋转以及磁制动盘的标志

Black hole spin from wobbling and rotation of the M87 jet and a sign of a magnetically arrested disc

Denis Nikolaevich Sob'yanin

摘要:

新的长期甚长基线阵列在43 GHz的M87射电星系中对著名的喷流进行的观测表明,喷流经历了大约8-10年准周期性的侧向移动。这种喷流摆动可能表明由倾斜的吸积盘引起的相对论性朗斯-瑟林岁差。摆动周期与最新的喷流旋转的运动学数据一起开辟了估计中央超大质量黑洞角动量的可能性。在测试粒子进动的情况下,比角动量是$J/Mc=(2.7\pm1.5)\times10^{14}$ cm,这意味着有争议的气体动力学和恒星动力学黑洞质量的无量纲自旋参数$a=0.5\pm0.3$和$0.31\pm0.17$适中。然而,在类固体进动的情况下,两个质量的自旋参数$0.15\pm0.05$都要小得多。根据其他独立的自旋估计拒绝这个值需要在M87中存在磁制动盘。

英文摘要:

New long-term Very Long Baseline Array observations of the well-known jet in the M87 radio galaxy at 43 GHz show that the jet experiences a sideways shift with an approximately 8-10 yr quasi-periodicity. Such jet wobbling can be indicative of a relativistic Lense-Thirring precession resulting from a tilted accretion disc. The wobbling period together with up-to-date kinematic data on jet rotation opens up the possibility for estimating angular momentum of the central supermassive black hole. In the case of a test-particle precession, the specific angular momentum is $J/Mc=(2.7\pm1.5)\times10^{14}$ cm, implying moderate dimensionless spin parameters $a=0.5\pm0.3$ and $0.31\pm0.17$ for controversial gas-dynamic and stellar-dynamic black hole masses. However, in the case of a solid-body-like precession, the spin parameter is much smaller for both masses, $0.15\pm0.05$. Rejecting this value on the basis of other independent spin estimations requires the existence of a magnetically arrested disc in M87.

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