光谱硬化作为黑洞态跃迁中圆盘截断的可行替代
Spectral hardening as a viable alternative to disc truncation in black hole state transitions
摘要：
约束的吸积流几何的黑洞二进制在爆发是复杂的简化多色盘模型无法区分的变化，在内部光盘半径和改变的紧急光谱，参数化的现象学颜色校正因子，f_col。我们分析罗西X射线定时探测器观测的低质量银河系黑洞X射线二进制，GX 339-4，在源头经历状态转换的七个纪元中吸积盘组件使用管道隔离，导致对盘光度的鲁棒检测，0.001 < L_disc / L_Edd < 0.5。假设内部光盘仍然位于最里面的稳定的圆形轨道的过程中的状态转换，我们测量的相对程度的变化f_col需要解释的光谱演化的光盘组件。一个变量f_col，增加了约2.0 - 3.5的一个因素，从高/软态的源转换到低/硬态可以充分解释所观察到的光盘光谱的演变。对于以盘成分为主的观测结果，可以观察到盘光度与有效温度之间的相似比例关系L_disc ~ T_eff ^[4];然而，当GX 339-4处于硬中间态和低/硬态时，这种关系出现了显著的偏差。考虑到光谱状态之间的f_col的变化，L_disc-T_eff^4定律在整个盘光度范围内都能得到恢复，尽管这在很大程度上取决于物理上可想象的f_col范围。我们证明，物理上合理的f_col变化为黑洞双星的多个状态跃迁提供了一个可行的描述，而不会引起内部吸积盘的径向运动。
英文摘要：
Constraining the accretion flow geometry of black hole binaries in outburst is complicated by the inability of simplified multi-colour disc models to distinguish between changes in the inner disc radius and alterations to the emergent spectrum, parameterised by the phenomenological colour correction factor, f_col. We analyse Rossi X-ray Timing Explorer observations of the low mass Galactic black hole X-ray binary, GX 339-4, taken over seven epochs when the source was experiencing a state transition. The accretion disc component is isolated using a pipeline resulting in robust detections for disc luminosities, 0.001 < L_disc / L_Edd < 0.5. Assuming that the inner disc remains situated at the innermost stable circular orbit over the course of a state transition, we measure the relative degree of change in f_col required to explain the spectral evolution of the disc component. A variable f_col that increases by a factor of ~ 2.0 - 3.5 as the source transitions from the high/soft state to the low/hard state can adequately explain the observed disc spectral evolution. For the observations dominated by a disc component, the familiar scaling between the disc luminosity and effective temperature, L_disc ~ T_eff^4, is observed; however, significant deviations from this relation appear when GX 339-4 is in the hard intermediate and low/hard states. Allowing for an evolving f_col between spectral states, the L_disc-T_eff^4 law is recovered over the full range of disc luminosities, although this depends heavily on the physically conceivable range of f_col. We demonstrate that physically reasonable changes in f_col provide a viable description for multiple state transitions of a black hole binary without invoking radial motion of the inner accretion disc.
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