A Quintet of Black Hole Mass Determinations
نویسندگان
چکیده
We report five new measurements of central black hole masses based on STIS and WFPC2 observations with the Hubble Space Telescope and on axisymmetric, three-integral, Schwarzschild orbit-library kinematic models. We selected a sample of galaxies within a narrow range in velocity dispersion that cover a range of galaxy parameters (including Hubble type and core/power-law surface density profile) where we expected to be able to resolve the galaxy’s sphere of influence based on the predicted value of the black hole mass from the M–σ relation. We find masses for the following galaxies: NGC 3585, MBH = 3.4+1.5 −0.6× 108 M ; NGC 3607, MBH = 1.2+0.4 −0.4× 108 M ; NGC 4026, MBH = 2.1 +0.7 −0.4× 108 M ; and NGC 5576, MBH = 1.0 +0.5 −0.3× 108 M , all significantly excluding MBH = 0. For NGC 3945, MBH = 9+17 −21× 106 M , which is significantly below predictions from M–σ and M–L relations and consistent with MBH = 0, though the presence of a double bar in this galaxy may present problems for our axisymmetric code. Subject headings: black hole physics — galaxies: general — galaxies:nuclei — stellar dynamics
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