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arXiv 1502.03284astro-ph.GAastro-ph.HE
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盘风作为潮汐破坏事件中缓慢演变温度的解释

Disk Winds as an Explanation for Slowly Evolving Temperatures in Tidal Disruption Events

M. Coleman Miller

摘要:

光学发现的潮汐破裂事件(TDEs)的许多有趣的方面之一是,它们的温度低于预期,并且温度不会像标准盘理论中预期的那样随着回落率的降低而迅速演变。我们表明,这可以用Laor和Davis在正常活动星系核的背景下提出的一个想法来定性地解释:较大的吸积率意味着更强的风,因此,通过内部磁盘的吸积率只依赖于弱流入率在磁盘的外缘。我们还表明,合理的定量协议的数据要求,如已建议在最近的论文中,潮汐流的圆半径约等于半长轴的最绑定轨道的碎片,而不是两倍的近心距离,预计没有快速的角动量重新分配。如果这种解释是正确的,它表明,TDEs的演变可能会测试非标准磁盘理论和潮汐流的相互作用的细节。

英文摘要:

Among the many intriguing aspects of optically discovered tidal disruption events (TDEs) is that their temperatures are lower than expected and that the temperature does not evolve as rapidly with decreasing fallback rate as would be expected in standard disk theory. We show that this can be explained qualitatively using an idea proposed by Laor & Davis in the context of normal active galactic nuclei: that larger accretion rates imply stronger winds and thus that the accretion rate through the inner disk only depends weakly on the inflow rate at the outer edge of the disk. We also show that reasonable quantitative agreement with data requires that, as has been suggested in recent papers, the circularization radius of the tidal stream is approximately equal to the semimajor axis of the most bound orbit of the debris rather than twice the pericenter distance as would be expected without rapid angular momentum redistribution. If this explanation is correct, it suggests that the evolution of TDEs may test both non-standard disk theory and the details of the interactions of the tidal stream.

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