在ULX中发现3：2双峰QPO的重要性或如何解决中等质量黑洞之谜
The importance of discovering a 3:2 twin-peak QPO in a ULX or how to solve the puzzle of intermediate mass black holes
摘要：
最近，在三个银河系黑洞微类星体中观察到了3：2的双峰QPO，其频率已被证明为1/M，正如黑洞附近的广义相对论运动所预期的那样。也许可以扩展这一结果，以区分以下两种不同的模型，这两种模型是针对令人费解的超亮X射线源（ULX）提出的：（1）中等质量的黑洞（M ~1000太阳质量）辐射非常接近爱丁顿极限;（2）常规的黑洞（M ~ 10太阳质量）以高的超爱丁顿速率吸积，其辐射沿自转轴传播。我们认为，这可能是可能的，以区分这些模型通过检测对应的银河双峰QPO在ULX：预期的频率为中等质量的黑洞模型只有约1赫兹，而对于传统的黑洞模型的预期频率将是~100赫兹的值观察到的银河微类星体。
英文摘要：
Recently, twin-peak QPOs have been observed in a 3:2 ratio for three Galactic black-hole microquasars with frequencies that have been shown to scale as 1/M, as expected for general relativisitic motion near a black hole. It may be possible to extend this result to distinguish between the following two disparate models that have been proposed for the puzzling ultraluminous X-ray sources (ULXs): (1) an intermediate-mass black hole M ~1000 solar mass) radiating very near the Eddington limit and (2) a conventional black hole (M ~ 10 solar mass) accreting at a highly super-Eddington rate with its emission beamed along the rotation axis. We suggest that it may be possible to distinguish between these models by detecting the counterpart of a Galactic twin-peak QPO in a ULX: the expected frequency for the intermediate-mass black hole model is only about 1 Hz, whereas, for the conventional black hole model the expected frequency would be the ~100 Hz value observed for the Galactic microquasars.
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