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arXiv 2402.09689astro-ph.HE
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超大质量黑洞瓦解恒星后的Lense-Thirring进动

Lense-Thirring Precession after a Supermassive Black Hole Disrupts a Star

Dheeraj R. Pasham, Michal Zajacek, C. J. Nixon, Eric R. Coughlin, Marzena Sniegowska, Agnieszka Janiuk, Bozena Czerny, Thomas Wevers, Muryel Guolo, Yukta Ajay, Michael Loewenstein

AI总结:

本文通过TDE的X射线准周期调制观测,将其归因于吸积盘Lense-Thirring进动,并据此将黑洞自旋参数限制在0.05<|a|<0.5。

摘要:

超大质量黑洞(SMBH)瓦解恒星后形成的吸积盘,预计最初会相对于黑洞赤道面倾斜。这种倾斜会在盘上引发相对论性力矩(Lense-Thirring效应),使盘在早期发生进动,而在晚期盘与黑洞对齐,进动终止。在此,我们利用对一个潮汐瓦解事件(TDE)的高节奏X射线监测观测,报告了来自一个TDE的强准周期X射线流量和温度调制的发现。这些X射线调制间隔为17.0$^{+1.2}_{-2.4}$天,并在TDE早期阶段持续约130天。吸积流的Lense-Thirring进动可以产生这种X射线变化,但不能排除其他物理机制,如辐射压不稳定性。假设典型的TDE参数,即类太阳恒星,其形成的盘最多延伸到所谓的圆化半径,并且盘作为刚体进动,我们将瓦解黑洞的无量纲自旋参数限制为0.05<|a|<0.5。

英文摘要:

An accretion disk formed around a supermassive black hole (SMBH) after it disrupts a star is expected to be initially misaligned with respect to the black hole's equatorial plane. This misalignment induces relativistic torques (the Lense-Thirring effect) on the disk, causing the disk to precess at early times, while at late times the disk aligns with the black hole and precession terminates. Here, using high-cadence X-ray monitoring observations of a TDE, we report the discovery of strong, quasi-periodic X-ray flux and temperature modulations from a TDE. These X-ray modulations are separated by 17.0$^{+1.2}_{-2.4}$ days and persist for roughly 130 days during the early phase of the TDE. Lense-Thirring precession of the accretion flow can produce this X-ray variability, but other physical mechanisms, such as the radiation-pressure instability, cannot be ruled out. Assuming typical TDE parameters, i.e., a solar-like star with the resulting disk extending at-most to so-called circularization radius, and that the disk precesses as a rigid body, we constrain the disrupting black hole's dimensionless spin parameter to be 0.05<|a|<0.5.

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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