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We present mass estimates of supermassive black holes in six nearby fastrotating early-type galaxies (NGC4339, NGC4434, NGC4474, NGC4551, NGC4578 andNGC4762) with effective stellar velocity dispersion around 100 km/s. We usenear-infrared laser-guide adaptive optics observations with the GEMINI/NIFS toderive stellar kinematics in the galactic nuclei, and SAURON observations fromthe ATLAS3D Survey for large-scale kinematics. We build axisymmetric Jeansanisotropic models and axisymmetric Schwarzschild dynamical models. Bothmodelling approaches recover consistent orbital anisotropies and black holemasses within 1-2sigma confidence level, except for one galaxy for which thedifference is just above the 3sigma level. Two black holes (NGC4339 andNGC4434) are amongst the largest outliers from the current black hole mass -velocity dispersion relation, with masses of $(4.3^{+4.8}_{-2.3})\times10^7$and $(7.0^{+2.0}_{-2.8})\times10^7$ M$_\odot$, respectively ($3\sigma$confidence level). The black holes in NGC4578 and NGC4762 lie on the scalingrelation with masses of $(1.9^{+0.6}_{-1.4})\times10^7$ and$(2.3^{+0.9}_{-0.6})\times10^7$ M$_\odot$, respectively (3sigma confidencelevel). For two galaxies (NGC4474 and NGC4551) we are able to place upperlimits on their black holes masses ($<7\times10^6$ and $<5\times10^6$M$_\odot$, respectively, $3\sigma$ confidence level). The kinematics for thesegalaxies clearly indicate central velocity dispersion drops within a radius of35 pc and 80 pc, respectively. These drops cannot be associated with coldstellar structures and our data do not have the resolution to exclude blackholes with masses an order of magnitude smaller than the predictions.Parametrizing the orbital distribution in spherical coordinates, the vicinityof the black holes is characterized by isotropic or mildly tangentialanisotropy.

monthly notices of the royal astronomical society

A quartet of black holes and a missing duo: probing the low-end of the  Mbh - sigma relation with the adaptive optics assisted integral-field  spectroscopy