M33: A Galaxy with No Supermassive Black Hole

Details M33: A Galaxy with No Supermassive Black Hole M33: A Galaxy with No Supermassive Black Hole

2001-07-06

arxiv.org/abs/astro-ph/0107135v2

Astronomy and Astrophysics

Astrophysics

8 pages, AJ accepted, November issue

Scientific paper

10.1086/323481

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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