论文标题
GSN 069-潮汐破坏近乎失踪
GSN 069 -- A Tidal Disruption Near-Miss
论文作者
论文摘要
我建议，最近从Galaxy GSN 069观察到的Quasiperiodic Ultrasoft X射线喷发可能是由于低质量白矮人在其中央黑洞上高度偏心轨道中产生的。在0.21m_sun时，这颗恒星可能是被捕获的红色巨人的核心。此类事件应大量发生，因为任何过程导致潮汐破坏事件的极端结果较小。我表明，重力辐射损失可以推动观察到的传质率，并且可以在X射线中检测到白色矮轨道的动力作为超大型ic ic ic ic ic ic ic iciperiod p_super〜2 d。当前事件的寿命很短，涉及更大恒星的类似事件的可能性也不那么可观察到，这表明恒星可以在此和类似的星系中以总速率将质量转移到低质量SMBH中，总速率可能会为其质量做出重大贡献。在大多数星系中，类似甚至更高的流入率将无法观察。我讨论对SMBH质量增长的影响。
I suggest that the quasiperiodic ultrasoft X-ray eruptions recently observed from the galaxy GSN 069 may result from accretion from a low-mass white dwarf in a highly eccentric orbit about its central black hole. At 0.21M_sun, this star was probably the core of a captured red giant. Such events should occur in significant numbers as less extreme outcomes of whatever process leads to tidal disruption events. I show that gravitational radiation losses can drive the observed mass transfer rate, and that the precession of the white dwarf orbit may be detectable in X-rays as a superorbital quasiperiod P_super ~ 2 d. The very short lifetime of the current event, and the likelihood that similar ones involving more massive stars would be less observable, together suggest that stars may transfer mass to the low-mass SMBH in this and similar galaxies at a total rate potentially making a significant contribution to their masses. A similar or even much greater inflow rate would be unobservable in most galaxies. I discuss the implications for SMBH mass growth.
