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Evidence for a supermassive black hole in NGC 3115
Kormendy, John; Richstone, Douglas
AA(Hawaii, University, Honolulu; Dominion Astrophysical Observatory, Victoria, Canada), AB(Institute for Advanced Study, Princeton, NJ; Michigan, University, Ann Arbor)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 2, July 10, 1992, p. 559-578. Research supported by Ambrose-Monell Foundation. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Astronomical Photometry, Black Holes (Astronomy), Elliptical Galaxies, Galactic Nuclei, Mass To Light Ratios, Stellar Rotation, Gas Dynamics, Lenticular Bodies, Maximum Entropy Method, Velocity Distribution
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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.

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