自引力均分吸积盘的不稳定性

采用微扰方法导了磁粘滞情况下自引力均分薄吸积盘的色散方程研究了吸积秀斩不稳定性，并分析了自引力，磁场，粘滞对吸积盘不稳定性的影响，数值计算表明，在同时考虑自引力和磁场时，吸积盘存在着３种振荡模式（总是稳定的粘滞横模式和通常不稳定的磁声模式及中性模式）这些结果为解释ＢＬ．Ｌａｃ天体，Ｓｅｙｆｅｒｔ星系，类星体等活动星系核的光变现象提供了理论依据。

THE INSTABILITY OF EQUIPARTITION ACCRETION DISK MODEL WITH SELF GRAVITATION

In this paper , we adapt the perturbation method to derive the dispersion relation of equipartition accretion disk with self gravitation .We have also studied the instability of the aceretion disk , discussed the effects of self gravitation, magnetic field and viscosity to the instability of the accretion disk .The numerical calculation results show that the accretion disk have three oscillatical modes when we consider both self gravitation and magnetic field .One is viscous mode ,which is always stable ,the others are magneto acoustic mode and the central mode, which are usually unstable . Our results give the theorical proofs to explain satisfactorily the optical violent variations in BL Lac objects ,Seyfert galaxies ,and quasars of AGN.