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arXiv 1106.0923astro-ph.HE
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Swift J1644 +57:一个白矮星被10^4 M_{odot}黑洞潮汐破坏?

Swift J1644+57: A White Dwarf Tidally Disrupted by a 10^4 M_{odot} Black Hole?

Julian H. Krolik, Tsvi Piran

摘要:

我们提出,值得注意的对象斯威夫特J1644+57,其中多次重复出现的硬X射线耀斑被视为在几天的跨度,是一个系统,其中白矮星被潮汐中断的中间质量黑洞。破坏一颗白矮星而不是一颗主序星提供了许多优势,有助于理解这个系统光变曲线中所看到的多个和短的时间尺度。特别是,白矮星的内部动力学时标很短,这为理解观测到的短上升时间($\sim 100$ s)提供了一种更自然的方式。耀斑之间相对较长的间隔($\sim 5 \times 10^4$ s)也可以很容易地理解为白矮星残骸连续通过近心点之间的周期。此外,当一颗白矮星被破坏时,预期的喷流功率更大。如果这个模型是正确的,那么产生这种现象的黑洞的质量一定是$\lesssim 10^5 M_{\odot}$。

英文摘要:

We propose that the remarkable object Swift J1644+57, in which multiple recurring hard X-ray flares were seen over a span of several days, is a system in which a white dwarf was tidally disrupted by an intermediate mass black hole. Disruption of a white dwarf rather than a main sequence star offers a number of advantages in understanding the multiple, and short, timescales seen in the light curve of this system. In particular, the short internal dynamical timescale of a white dwarf offers a more natural way of understanding the short rise times ($\sim 100$ s) observed. The relatively long intervals between flares ($\sim 5 \times 10^4$ s) may also be readily understood as the period between successive pericenter passages of the remnant white dwarf. In addition, the expected jet power is larger when a white dwarf is disrupted. If this model is correct, the black hole responsible must have mass $\lesssim 10^5 M_{\odot}$.

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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