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Adaptive-Optics assisted SINFONI observations of the central regions of tenearly-type galaxies are presented. Based primarily on the SINFONI kinematics,ten black hole masses occupying the high-mass regime of the M_BH-sigma relationare derived using three-integral Schwarzschild models. The effect of darkmatter inclusion on the black hole mass is explored. The omission of a darkmatter halo in the model results in a higher stellar mass-to-light ratio,especially when extensive kinematic data are used in the model. However, whenthe diameter of the sphere of influence -- computed using the black hole massderived without a dark halo -- is at least 10 times the PSF FWHM during theobservations, it is safe to exclude a dark matter component in the dynamicalmodeling, i.e. the change in black hole mass is negligible. When the spatialresolution is marginal, restricting the mass-to-light ratio to the right valuereturns the correct M_BH although dark halo is not present in the model.Compared to the M_BH-sigma and M_BH-L relations of McConnell et al. (2011), theten black holes are all more massive than expected from the luminosities andseven black hole masses are higher than expected from the stellar velocitydispersions of the host bulges. Using new fitted relations which include theten galaxies, we find that the space density of the most massive black holes(M_BH >~ 10^9 Msun) estimated from the M_BH-L relation is higher than theestimate based on the M_BH-sigma relation and the latter is higher than modelpredictions based on quasar counts, each by about an order of magnitude.

The Influence of Dark Matter Halos on Dynamical Estimates of Black Hole Mass: Ten New Measurements for High-sigma Early-Type Galaxies