M33: A Galaxy with No Supermassive Black Hole
The Astronomical Journal2001Vol. 122(5), pp. 2469–2476
Citations Over TimeTop 10% of 2001 papers
Karl Gebhardt, Tod R. Lauer, John Kormendy, Jason Pinkney, Gary Bower, Richard F. Green, T. Gull, J. B. Hutchings, M. E. Kaiser, Charles H. Nelson, D. O. Richstone, D. Weistrop
Abstract
Galaxies that contain bulges appear to contain central black holes whose masses correlate with the velocity dispersion of the bulge. We show that no corresponding relationship applies in the pure disk galaxy M33. Three-integral dynamical models fit Hubble Space Telescope WFPC2 photometry and STIS spectroscopy best if the central black hole mass is zero. The upper limit is 1500 M_sun. This is significantly below the mass expected from the velocity dispersion of the nucleus and far below any mass predicted from the disk kinematics. Our results suggest that supermassive black holes are associated only with galaxy bulges and not with their disks.
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