The M• −σ Relation for Supermassive Black Holes
نویسندگان
چکیده
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 Milky Way. 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)×10M⊙(σc/200 km s −1)4.72(±0.36). Subject headings: black hole physics — galaxies: kinematics and dynamics — methods: data analysis
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تاریخ انتشار 2008