离开ISCO：在不同光度下黑洞吸积盘的内边缘
Leaving the ISCO: the inner edge of a black-hole accretion disk at various luminosities
摘要：
吸积盘的“辐射内边缘”定义为大部分亮度出现的区域的内边界。类似地，“反射边缘”是能够产生荧光铁线的显著X射线反射的最小半径。对于具有非常亚爱丁顿光度的黑洞吸积盘，这些和所有其他“内边缘”位于ISCO。因此，在这种情况下，人们可以正确地认为ISCO是黑洞吸积盘的唯一内缘。然而，即使对于中等亮度，也不存在唯一的内边缘，因为不同定义的边缘位于不同的位置。其中有几个比ISCO更接近黑洞。差异随着亮度的增加而增加。对于接近爱丁顿的光度，它们是如此巨大，以至于内边缘的概念失去了所有的实际意义。
英文摘要：
The "radiation inner edge" of an accretion disk is defined as the inner boundary of the region from which most of the luminosity emerges. Similarly, the "reflection edge" is the smallest radius capable of producing a significant X-ray reflection of the fluorescent iron line. For black hole accretion disks with very sub-Eddington luminosities these and all other "inner edges" locate at ISCO. Thus, in this case, one may rightly consider ISCO as the unique inner edge of the black hole accretion disk. However, even for moderate luminosities, there is no such unique inner edge as differently defined edges locate at different places. Several of them are significantly closer to the black hole than ISCO. The differences grow with the increasing luminosity. For nearly Eddington luminosities, they are so huge that the notion of the inner edge losses all practical significance.
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