XTE J1550-564和GRO J1655-40中3：2 HFQPO对与铁钾宽线的关联
Association of the 3:2 HFQPO Pairs with the Broad Fe K Line in XTE J1550-564 and GRO J1655-40
摘要：
基于旋转黑洞与其周围圆盘的磁耦合，讨论了XTE J1550-564和GRO J1655-40中高频准周期振荡对与宽Fe K线的关联. 3：2的HFQPO对被解释为凭借的内部和外部热点所产生的非轴对称磁场，其中内部热点是由施加在盘的内边缘的扭矩，和外部热点所产生的大规模磁场的螺旋不稳定性。非常陡峭的发射率指数主要是由施加在圆盘内边缘的扭矩产生的。结果表明，通过调整BH自旋等模型参数，可以拟合出两个源中观测到的3：2 HFQPO对，该模型的主要特点在于三个方面。(1)基于产生3：2 HFQPO对的两种机制讨论了只有一个HFQPO的条件，（2）给出了当HFQPO对从高频向低频移动时，随着幂律通量的增加，系统地远离盘主导通量的解释，这与Remillard等人（2002）给出的分析一致，（3）XTE J1550-564和GRO J1655-40中的BH自旋可以通过将3：2 HFQPO对与拟合宽Fe K发射线所需的非常陡峭的发射率指数相结合来估计。
英文摘要：
Association of the high-frequency quasi-periodic oscillation (HFQPO) pairs with the broad Fe K line in XTE J1550-564 and GRO J1655-40 is discussed based on the magnetic coupling (MC) of a rotating black hole (BH) with its surrounding disc. The 3:2 HFQPO pairs are interpreted by virtue of the inner and outer hotspots arising from non-axisymmetric magnetic field, where the inner hotspot is produced by a torque exerted at the inner edge of the disc, and the outer hotspot is created by the screw instability of the large-scale magnetic field. The very steep emissivity index is created predominantly by the torque exerted at the inner edge of the disc. It turns out that the 3:2 HFQPO pairs observed in the two sources can be fitted by tuning several model parameters, such as the BH spin, and the main features of this model lie in three aspects. (1) The condition for only one HFQPO is discussed based on the two mechanisms for producing the 3:2 HFQPO pairs, (2) an explanation is given for a systematic shift away from disc dominated flux with the increasing power-law flux as the HFQPO pairs shift from the higher to lower frequencies, which is consistent with the analysis given by Remillard et al. (2002), and (3) the BH spin in XTE J1550-564 and GRO J1655-40 can be estimated by combining the 3:2 HFQPO pairs with the very steep emissivity index required for fitting the broad Fe K emission line.
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