LIGO告诉我们，内衬不是光学厚的RIAF
LIGO tells us LINERs are not optically thick RIAFs
摘要：
低电离发射线区（LINER）是本宇宙中最多可达$1/3$的星系核的异质集合。目前还不清楚LINER是否仅仅是超大质量黑洞的低吸积率的结果，或者它们是否包括大量光学厚辐射效率低但超级爱丁顿吸积流（RIAF）。光学厚的RIAF通常是大尺度高度或准球形气流的盘。这些黑洞的密度应该足以捕获并合并大量恒星质量的黑洞，我们预计这些黑洞存在于星系核中。电磁观测吸积流光球不允许我们打破模型退化。然而，引力波观测探测吸积流的内部，在那里恒星质量的黑洞的合并可以大大加速超过场速率。在这里，我们表明，LIGO观测到的黑洞合并率的上限表明，大多数LINER不能光学厚RIAF。
英文摘要：
Low ionization emission line regions (LINERs) are a heterogeneous collection of up to $1/3$ of galactic nuclei in the local Universe. It is unclear whether LINERs are simply the result of low accretion rates onto supermassive black holes or whether they include a large number of optically thick radiatively inefficient but super-Eddington accretion flows (RIAFs). Optically thick RIAFs are typically disks of large scale-height or quasi-spherical gas flows. These should be dense enough to trap and merge a large number of the stellar mass black holes, which we expect to exist in galactic nuclei. Electromagnetic observations of photospheres of accretion flows do not allow us to break model degeneracies. However, gravitational wave observations probe the interior of accretion flows where the merger of stellar mass black holes can be greatly accelerated over the field rate. Here we show that the upper limits on the rate of black hole mergers observed with LIGO demonstrate that most LINERs cannot be optically thick RIAFs.
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