Effects of Magnetic Coupling on Radiation from Accretion Disc around a Kerr Black Hole
The effects of magnetic coupling (MC) process on the inner edge of the disc are discussed in detail. It is shown that the inner edge can deviate from the innermost stable circular orbit (ISCO) due to the magnetic transfer of energy and angular momentum between a Kerr black hole (BH) and its surrounding accretion disc. It turns out that the inner edge could move inward and outward for the BH spin a*being greater and less than 0.3594, respectively. The MC effects on disc radiation are discussed based on the displaced inner edge. A very steep emissivity can be provided by the MC process, which is consistent with the observation of MCG-6-30-15. In addition, the BH spins of GRO J1655-40 and GRS 1915+105 are detected by X-ray continuum fitting based on this model.
accretion accretion disc- black hole physics-magnetic field
Zhao-Ming Gan Ding-Xiong Wang Yang Li
Department of Physics,Huazhong University of Science and Technology,Wuhan 430074,China
国际会议
北京
英文
2007-04-21（万方平台首次上网日期，不代表论文的发表时间）