Astron. J., 146, 45 (2013/September-0)
The influence of dark matter halos on dynamical estimates of black hole mass: 10 new measurements for high-σ early-type galaxies.
RUSLI S.P., THOMAS J., SAGLIA R.P., FABRICIUS M., ERWIN P., BENDER R., NOWAK N., LEE C.H., RIFFESER A. and SHARP R.
Abstract (from CDS):
Adaptive optics assisted SINFONI observations of the central regions of 10 early-type galaxies are presented. Based primarily on the SINFONI kinematics, 10 black hole (BH) masses occupying the high-mass regime of the MBH-σ relation are derived using three-integral Schwarzschild models. The effect of dark matter (DM) inclusion on the BH mass is explored. The omission of a DM halo in the model results in a higher stellar mass-to-light ratio, especially when extensive kinematic data are used in the model. However, when the diameter of the sphere of influence–computed using the BH mass derived without a dark halo–is at least 10 times the point-spread function FWHM during the observations, it is safe to exclude a DM component in the dynamical modeling, i.e., the change in BH mass is negligible. When the spatial resolution is marginal, restricting the mass-to-light ratio to the right value returns the correct MBH although a dark halo is not present in the model. Compared to the MBH-σ and MBH-L relations of McConnell et al., the 10 BHs are all more massive than expected from the luminosities and 7 BH masses are higher than expected from the stellar velocity dispersions of the host bulges. Using new fitted relations, which include the 10 galaxies, we find that the space density of the most massive BHs (MBH ≳ 109 M☉) estimated from the MBH-L relation is higher than the estimate based on the MBH-σ relation and the latter is higher than model predictions based on quasar counts, each by about an order of magnitude.
galaxies: elliptical and lenticular, cD - galaxies: kinematics and dynamics - galaxies: nuclei
VizieR on-line data:
<Available at CDS (J/AJ/146/45): table1.dat table5.dat table6.dat table7.dat table8.dat table9.dat table10.dat table11.dat table12.dat table13.dat>
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