论文标题
准周期性Erupters：辐射的恒星质量转移模型
Quasi-Periodic Erupters: A Stellar Mass-Transfer Model for the Radiation
论文作者
论文摘要
准周期性Erupters（QPE）是一类出色的物体，表现出非常大的准周期性X射线耀斑。尽管已经提出了许多动力学模型来解释它们，但很少有人注意使用其辐射的特性来限制其动力学。在这里，我们表明观察到的亮度，光谱，重复周期，占空比和后两个数量的波动指向一个模型：其中：在超级质量黑洞周围中等偏心轨道上的主序列恒星定期将质量定期转移到黑洞的罗氏叶；轨道动力学导致黑洞附近有轻微的权利性冲击。在观察到的温度下的热X射线在远离冲击时会发出。强烈的X射线照射通过耀斑本身增强了传质，在耀斑的时机中产生波动，并在恒星大气中搅动湍流，从而将磁场放大到一个可以加速磁力的水平，即磁应力可以加速转移质量的质量。
Quasi-Periodic Erupters (QPEs) are a remarkable class of objects exhibiting very large amplitude quasi-periodic X-ray flares. Although numerous dynamical models have been proposed to explain them, relatively little attention has been given to using the properties of their radiation to constrain their dynamics. Here we show that the observed luminosity, spectrum, repetition period, duty cycle, and fluctuations in the latter two quantities point toward a model in which: a main sequence star on a moderately eccentric orbit around a supermassive black hole periodically transfers mass to the Roche lobe of the black hole; orbital dynamics lead to mildly-relativistic shocks near the black hole; and thermal X-rays at the observed temperature are emitted by the gas as it flows away from the shock. Strong X-ray irradiation of the star by the flare itself augments the mass transfer, creates fluctuations in flare timing, and stirs turbulence in the stellar atmosphere that amplifies magnetic field to a level at which magnetic stresses can accelerate infall of the transferred mass toward the black hole.
