黑洞GRO J1655-40中的混合磁/热驱动风？
A Hybrid Magnetically/Thermally-Driven Wind in the Black Hole GRO J1655-40?
摘要：
GRO J1655-40在2005年爆发期间，曾被钱德拉高能透射光栅光谱仪观测过两次;第二次观测显示光谱中富含从O到Ni的元素的电离吸收线（Miller等人，2006 a，2008; Kallman等人，2009），表明流出物密度太大，电离程度太高，无法由辐射或热压力驱动。到目前为止，这个光谱是唯一明确的证据，电离风驱动的吸积盘的磁性过程中的黑洞X射线双星。在这里，我们提出了我们的第一个钱德拉观测，近三个星期前，其中唯一的签名风是Fe XXVI吸收线的详细光谱分析。通过光电离模型比较宽带X射线光谱，我们认为，钱德拉光谱的差异不可能被解释的电离光谱的变化，这意味着风的属性不能在整个爆发是恒定的。我们探讨风的变化，我们建议可能开始作为混合MHD/热风的物理场景，但在几个星期的过程中演变成两个不同的流出具有不同的属性。我们讨论了我们的结果之间的联系的吸积流的状态和存在的瞬态盘风的影响。
英文摘要：
During its 2005 outburst, GRO J1655-40 was observed twice with the Chandra High Energy Transmission Grating Spectrometer; the second observation revealed a spectrum rich with ionized absorption lines from elements ranging from O to Ni (Miller et al. 2006a, 2008; Kallman et al. 2009), indicative of an outflow too dense and too ionized to be driven by radiation or thermal pressure. To date, this spectrum is the only definitive evidence of an ionized wind driven off the accretion disk by magnetic processes in a black hole X-ray binary. Here we present our detailed spectral analysis of the first Chandra observation, nearly three weeks earlier, in which the only signature of the wind is the Fe XXVI absorption line. Comparing the broadband X-ray spectra via photoionization models, we argue that the differences in the Chandra spectra cannot possibly be explained by the changes in the ionizing spectrum, which implies that the properties of the wind cannot be constant throughout the outburst. We explore physical scenarios for the changes in the wind, which we suggest may begin as a hybrid MHD/thermal wind, but evolves over the course of weeks into two distinct outflows with different properties. We discuss the implications of our results for the links between the state of the accretion flow and the presence of transient disk winds.
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