An accretion model for the growth of the central black hole associated   with ionization instability in quasars
  A possible accretion model associated with the ionization instability of quasar disks is proposed to address the growth of the central black hole harbored in the host galaxy.The mass ratio between black hole and its host galactic bulge is a nature consequence of our model. 
Y. Lu (National Astronomical Observatories, Chinese Academy of   Sciences, Beijing, China), K.S. Cheng (Department of Physic...