吸积引起的变化联系着年轻的恒星、白矮星和黑洞
Accretion-induced variability links young stellar objects, white dwarfs, and black holes
摘要：
吸积盘的恒星质量黑洞的中心引擎似乎是为活动星系核提供动力的超大质量黑洞的缩小版本。然而，如果吸积的物理学是普遍的，它也应该有可能扩展到其他类型的吸积系统，无论吸积质量，大小或类型。我们研究新的观测，获得与开普勒/K2和ULTRACAM，关于吸积白矮星和年轻的恒星物体。样本中的每一个天体都显示出与恒星质量黑洞和活动星系核相同的光源亮度与其变化幅度（均方根通量关系）之间的线性关系，并服从相同的定量标度关系。我们还表明，在这个标度关系中最重要的参数是吸积物体的物理尺寸。这确立了吸积物理学的普遍性，从仍处于恒星形成过程中的原恒星到星系中心的超大质量黑洞。
英文摘要：
The central engines of disc-accreting stellar-mass black holes appear to be scaled down versions of the supermassive black holes that power active galactic nuclei. However, if the physics of accretion is universal, it should also be possible to extend this scaling to other types of accreting systems, irrespective of accretor mass, size, or type. We examine new observations, obtained with Kepler/K2 and ULTRACAM, regarding accreting white dwarfs and young stellar objects. Every object in the sample displays the same linear correlation between the brightness of the source and its amplitude of variability (rms-flux relation) and obeys the same quantitative scaling relation as stellar-mass black holes and active galactic nuclei. We also show that the most important parameter in this scaling relation is the physical size of the accreting object. This establishes the universality of accretion physics from proto-stars still in the star-forming process to the supermassive black holes at the centers of galaxies.
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