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 – \sigma relation .
We find masses for the following galaxies : NGC 3585 , M _ { \mathrm { BH } } = 3.4 ^ { +1.5 } _ { -0.6 } \times 10 ^ { 8 } ~ { } { \mathrm { M } } _ { % \scriptscriptstyle \odot } ; NGC 3607 , M _ { \mathrm { BH } } = 1.2 ^ { +0.4 } _ { -0.4 } \times 10 ^ { 8 } ~ { } { \mathrm { M } } _ { % \scriptscriptstyle \odot } ; NGC 4026 , M _ { \mathrm { BH } } = 2.1 ^ { +0.7 } _ { -0.4 } \times 10 ^ { 8 } ~ { } { \mathrm { M } } _ { % \scriptscriptstyle \odot } ; and NGC 5576 , M _ { \mathrm { BH } } = 1.8 ^ { +0.3 } _ { -0.4 } \times 10 ^ { 8 } ~ { } { \mathrm { M } } _ { % \scriptscriptstyle \odot } , all significantly excluding M _ { \mathrm { BH } } = 0 .
For NGC 3945 , M _ { \mathrm { BH } } = 9 ^ { +17 } _ { -21 } \times 10 ^ { 6 } ~ { } { \mathrm { M } } _ { \scriptscriptstyle \odot } , which is significantly below predictions from M – \sigma and M – L relations and consistent with M _ { \mathrm { BH } } = 0 , though the presence of a double bar in this galaxy may present problems for our axisymmetric code .