The Influence of Magnetic Braking on Neutrino-dominated Accretion Disk
We consider the influence of magnetic fields on the model of Neutrino-dominated Accretion Flows(NDAFs)forgamma-ray bursts(GRBs) via the assumption that the accretion rate of the disk is totally caused by the torque of Lorentz force(i.e．magnetic braking)and magnetic viscosity．It turns out that the over-pressure magnetic fields shall be formed inevitablyunder the assumption of the steady-state accretion．It strongly implys that the steady-state accretion may be quite unstable atsuch high accretion rate of several solar masses．It is favorable to interpret the observed X-ray flares in the early afterglow ofthe GRBs．We also find that it is quite inconvenient for neutrino mechanism of the NDAFs to power the X-ray flares,since theluminosity drops rapidly with the decrease of accretion rate after the magnetic fields were included.
physics of black holes accretion and accretion discs magnetic and electric fields gamma-rays bursts
Yi Xie Xiao-Qing Wen Wei-Hua Lei
School of Physics and Information Engineering,Shanxi Normal University,Linfen 041004,China School of Sciences,Nanchang University,Nanchang 330031,China School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China
国际会议
2008 NanJing Gamma-Ray Burst Conference(2008年伽马暴国际研讨会)
南京
英文
302-305
2008-06-23（万方平台首次上网日期，不代表论文的发表时间）