Abstract

We investigate the differences in the M• σ relation derived recently by Ferrarese & Merritt and by Gebhardt and collaborators. The shallower slope found by the latter authors (3.75 vs. 4.8) is due partly to the use of a regression algorithm that ignores measurement errors, and partly to the value of the velocity dispersion adopted for a single galaxy, the MilkyWay. A steeper relation is shown to provide a better fit to black hole masses derived from reverberation mapping studies. Combining the stellar dynamical, gas dynamical, and reverberation mapping mass estimates, we derive a best-fit relation M• = 1.30(±0.36)×10^8M⊙(σc/200 km s1)^(4.72(±0.36) )(Refer to PDF file for exact formulas).

Publication Date

1-20-2001

Comments

Also archived in: arXiv:astro-ph/0008310 v1 20 Aug 2000 LF acknowledges grant NASA NAG5-8693, and DM acknowledges grants NSF AST 96-17088 and NASA NAG5-6037.ISSN:1538-4357 Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

Document Type

Article

Department, Program, or Center

School of Physics and Astronomy (COS)

Campus

RIT – Main Campus

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