Emission line profiles from self-gravitating toroids around black holes
  We have computed line profiles from self-gravitating toroids around black holes. The specific angular momentum of the toroids is assumed to be constant in space. The images of the toroids show peculiar feature in the rear side of the black holes. Concerning the line profiles, the red wing extends to the very small frequency region because the location of the inner edge is rather near the event horizon of the black hole and consequently the velocity of the inner edge of toroids can be faster than that of the Kepler disks. 
Fumihiko Usui, Shogo Nishida, Yoshiharu Eriguchi (University of Tokyo)