A Quintet Of Black Hole Mass Determinations

Date
2009-04
Authors
Gueltekin, Kayhan
Richstone, Douglas O.
Gebhardt, Karl
Lauer, Tod R.
Pinkney, Jason
Aller, Monique C.
Bender, Ralf
Dressler, Alan
Faber, S. M.
Filippenko, Alexei V.
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Abstract

We report five new measurements of central black hole masses based on Space Telescope Imaging Spectrograph and Wide Field Planetary Camera 2 observations with the Hubble Space Telescope (HST) 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: NGC3585, M(BH) = 3.4(-0.6)(+1.5) x 10(8) M(circle dot;) NGC 3607, M(BH) = 1.2(-0.4)(+0.4) x 10(8) M(circle dot); NGC 4026, M(BH) = 2.1(-0.4)(+0.7) x 10(8) M(circle dot); and NGC 5576, M(BH) = 1.8(-0.4)(+0.3) x 10(8) M(circle dot), all significantly excluding M(BH) = 0. For NGC 3945, M(BH) = 9(-21)(+17) x 10(6) M(circle dot), which is significantly below predictions from M-sigma 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.

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Citation
G�ltekin, Kayhan, Douglas O. Richstone, Karl Gebhardt, Tod R. Lauer, Jason Pinkney, M. C. Aller, Ralf Bender et al. "A quintet of black hole mass determinations." The Astrophysical Journal, Vol. 695, No. 2 (Apr., 2009): 1577.