Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393..559k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 2, July 10, 1992, p. 559-578. Research supported by Ambrose-Monell
Astronomy and Astrophysics
Astronomy
89
Astronomical Photometry, Black Holes (Astronomy), Elliptical Galaxies, Galactic Nuclei, Mass To Light Ratios, Stellar Rotation, Gas Dynamics, Lenticular Bodies, Maximum Entropy Method, Velocity Distribution
Scientific paper
Kinematic data on NGC 3115 are examined that point toward the existence of a supermassive black hole, and 3D velocity and velocity-dispersion fields are derived to search for the black hole. Observational data on the stellar rotation velocities and velocity dispersions are discussed, and V-band surface photometry are reviewed. The central mass-to-light ratio is assumed to be very high for the object since the central dispersion is significantly higher than the scatter in the Faber-Jackson correlation between central dispersion and bulge luminosity. The 3D velocity and velocity-dispersion fields are derived so that they fit the observations after projection and seeing convolution. The mass-to-light ratio is shown to rise by more than a factor of 10 at values of r of less than 2 arcsec to values of M/LV of more than 50. The central bulge is theorized to be isotropic with a black-hole mass of about 1-2 x 10 exp 9 solar masses.
Kormendy John
Richstone Douglas
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