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arXiv 1304.6397astro-ph.HE
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PS1-10jh:一颗近太阳主序星的分裂

PS1-10jh: The Disruption of a Main-Sequence Star of Near-Solar Composition

James Guillochon, Haik Manukian, Enrico Ramirez-Ruiz

摘要:

当一颗恒星靠近超大质量黑洞(SMBH)的临界距离时,巨大的潮汐力会破坏恒星,导致碎片流落回SMBH,并为明亮的耀斑提供动力。在本文中,我们进行流体动力学模拟的中断主序星的SMBH的潮汐中断后的碎片流的演化特征。我们证明,这种碎片流是由自引力限制在两个方向上垂直于原来的方向的恒星的旅行,因此有一个可以忽略不计的表面积,使几乎没有贡献的连续或线发射。因此,我们建议,任何观察到的发射线是不是在这个未绑定的碎片光电离的结果,但在形成的椭圆形吸积盘的上方和下方的区域,类似于宽线区(BLR)在强烈吸积的活动星系核。由于BLR中的每条线在观测上都与吸积盘中的一个特定位置有关,我们认为,没有线表明吸积盘还没有延伸到产生该线所需的距离。该模型可用于理解潮汐破裂事件(TDE)PS 1 - 10 jh的光谱特性,在该事件中观测到He II谱线,但未观测到巴耳末系和He I谱线。使用极大似然分析,我们表明,近太阳组成的主序星的破坏可以重现这一事件。

英文摘要:

When a star comes within a critical distance to a supermassive black hole (SMBH), immense tidal forces disrupt the star, resulting in a stream of debris that falls back onto the SMBH and powers a luminous flare. In this paper, we perform hydrodynamical simulations of the disruption of a main-sequence star by a SMBH to characterize the evolution of the debris stream after a tidal disruption. We demonstrate that this debris stream is confined by self-gravity in the two directions perpendicular to the original direction of the star's travel, and as a consequence has a negligible surface area and makes almost no contribution to either the continuum or line emission. We therefore propose that any observed emission lines are not the result of photoionization in this unbound debris, but are produced in the region above and below the forming elliptical accretion disk, analogous to the broad-line region (BLR) in steadily-accreting active galactic nuclei. As each line within a BLR is observationally linked to a particular location in the accretion disk, we suggest that the absence of a line indicates that the accretion disk does not yet extend to the distance required to produce that line. This model can be used to understand the spectral properties of the tidal disruption event (TDE) PS1-10jh, for which He II lines are observed, but the Balmer series and He I are not. Using a maximum likelihood analysis, we show that the disruption of a main-sequence star of near-solar composition can reproduce this event.

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