MAXI J1305-704的钱德拉光谱：探测到一个下落的黑洞盘风？
Chandra Spectroscopy of MAXI J1305-704: Detection of an Infalling Black Hole Disk Wind?
摘要：
我们报告的钱德拉/HETG X射线光谱的黑洞候选人MAXI J1305-704。一个丰富的吸收复合物中检测到的Fe L带，包括密度敏感线从Fe XX，XXI和XXII。采用光电离模型对三个谱带进行光谱分析，通常需要气体密度n > 1 E+17 cm^-3。假设光度为L = 1 E+37 erg/s，则与10-14 A波段的拟合将吸收气体限制在距离中心发动机r = 3.9（7）E+3 km的范围内，或约r = 520 +/- 90（M/5 Msun）r_g，其中r_g = GM/c^2。在距离致密天体如此远的地方，开普勒轨道上的气体的引力红移应为z = v/c ~ 3 +/- 1 E-3（M/5 Msun），任何稀薄的流入气体的自由落体速度应为v/c ~ 6 +/- 1 E-2（M/5 Msun）^[1/2]。最佳拟合的单区光电离模型测量的红移为v/c = 2.6-3.2 E-3。具有两个区域的模型提供了显着改进的拟合;额外的区域被测量为具有v/c =4.6-4.9 E-2的红移（包括两个区域的模型表明半径略有不同，可能指向较低的密度）。因此，位移与光电离半径大致一致。这些结果可以用“失效风”来解释，就像在一些数值模拟中预测的那样。我们讨论了我们的结果的背景下，吸积流的质量尺度，失败的风在黑洞状态转换的潜在作用。
英文摘要：
We report on a Chandra/HETG X-ray spectrum of the black hole candidate MAXI J1305-704. A rich absorption complex is detected in the Fe L band, including density-sensitive lines from Fe XX, XXI, and XXII. Spectral analysis over three bands with photoionization models generally requires a gas density of n > 1 E+17 cm^-3. Assuming a luminosity of L = 1 E+37 erg/s, fits to the 10-14 A band constrain the absorbing gas to lie within r = 3.9(7) E+3 km from the central engine, or about r = 520 +/- 90 (M/5 Msun) r_g, where r_g = GM/c^2. At this distance from the compact object, gas in Keplerian orbits should have a gravitational red-shift of z = v/c ~ 3 +/- 1 E-3 (M/5 Msun), and any tenuous inflowing gas should have a free-fall velocity of v/c ~ 6 +/- 1 E-2 (M/5 Msun)^1/2. The best-fit single-zone photoionization models measure a red-shift of v/c = 2.6-3.2 E-3. Models with two zones provide significantly improved fits; the additional zone is measured to have a red-shift of v/c =4.6-4.9 E-2 (models including two zones suggest slightly different radii and may point to lower densities). Thus, the shifts are broadly consistent with the photoionization radius. The results may be explained in terms of a "failed wind" like those predicted in some numerical simulations. We discuss our results in the context of accretion flows across the mass scale, and the potential role of failed winds in black hole state transitions.
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