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A Quintet of Black Hole Mass Determinations

  • Gultekin, Kayhan
  • Richstone, Douglas O.
  • Gebhardt, Karl
  • Lauer, Tod R.
  • Pinkney, Jason
  • Aller, M. C.
  • Bender, Ralf
  • Dressler, Alan
  • Faber, S. M.
  • Filippenko, Alexei V.
  • Green, Richard
  • Ho, Luis C.
  • Kormendy, John
  • Siopis, Christos
Published Article
Publication Date
May 01, 2009
Submission Date
Jan 27, 2009
DOI: 10.1088/0004-637X/695/2/1577
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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 in units of 10^8 solar masses for the following galaxies: NGC 3585, M_BH = 3.4 (+1.5, -0.6); NGC 3607, M_BH = 1.2 (+0.4, -0.4); NGC 4026, M_BH = 2.1 (+0.7, -0.4); and NGC 5576, M_BH = 1.8 (+0.3, -0.4), all significantly excluding M_BH = 0. For NGC 3945, M_BH = 0.09 (+0.17, -0.21), which is significantly below predictions from M-sigma and M-L relations and consistent with M_BH = 0, though the presence of a double bar in this galaxy may present problems for our axisymmetric code.

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