Studies of State Transitions in Black Hole Candidates by Collaboration between Magnetohydrodynamic Simulations and X-ray Observations

通过理论/模拟研究和X射线观测之间的合作，研究了黑洞候选者的状态转换。通过应用一个更高精度的磁流体动力学程序的基础上的HLLD方案的硬到软的转变，我们发现，明亮的硬态是通过平衡的磁能释放和辐射冷却，通过磁重联发电机附近的黑洞和强大的方位场的外盘之间的保持。我们还解释了观测到的状态转换潮汐破坏事件斯威夫特J1644+57超临界吸积到超大质量黑洞的辐射流体动力学模拟。

State transitions of black hole candidates are studied by collaboration between theoretical/simulation studies and X-ray observations. By applying a higher accuracy magnetohydrodynamic code based on the HLLD scheme to hard-to-soft transitions, we found that luminous hard state is maintained by balancing the magnetic energy release and radiative cooling through magnetic reconnection between dynamo fields near the black hole and strong azimuthal fields in the outer disk. We also explained the state transitions observed during a tidal disruption event Swift J1644+57 by radiation hydrodynamic simulations of supercritical accretion onto a supermassive black hole.