开普勒巨脉泽的起源
The Origin of Keplerian Megamaser Disks
摘要：
在活跃星系的核中发现了几个薄的开普勒亚秒差距巨脉泽盘的例子，并用于精确确定其宿主黑洞的质量。我们发现，有一个经验的线性相关性之间的磁盘半径和黑洞的质量，这样的磁盘是自然形成的分子云通过星系核和暂时吞没中央超大质量黑洞。当初始云柱密度低于10^{23.5} cm^{-2}时，盘是非自引力的，但当云柱密度更高时，盘会碎裂并产生类似于银河系中心人马座A* 周围观测到的致密恒星盘。
英文摘要：
Several examples of thin, Keplerian, sub-parsec megamaser disks have been discovered in the nuclei of active galaxies and used to precisely determine the mass of their host black holes. We show that there is an empirical linear correlation between the disk radius and black hole mass and that such disks are naturally formed as molecular clouds pass through the galactic nucleus and temporarily engulf the central supermassive black hole. For initial cloud column densities below about 10^{23.5} cm^{-2} the disk is non-self gravitating, but for higher cloud columns the disk would fragment and produce a compact stellar disk similar to that observed around Sgr A* at the galactic centre.
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