Testing the Consistency of Stellar and Gas Dynamical Black Hole Mass Measurements in AGNs

Details Testing the Consistency of Stellar and Gas Dynamical Black Hole Mass Measurements in AGNs Testing the Consistency of Stellar and Gas Dynamical Black Hole Mass Measurements in AGNs

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21710607w&link_type=abstract

American Astronomical Society, AAS Meeting #217, #106.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

Physics

Optics

Scientific paper

NGC 3998 and NGC 4203 are two nearby S0 galaxies with LINER nuclei. The mass of the black hole in NGC 3998 has been measured previously through gas dynamical modeling of the emission-line disk using HST/STIS observations, while a gas dynamical measurement of the black hole mass in NGC 4203 is currently in progress. As both objects are also good targets for stellar dynamical modeling, they provide an excellent opportunity for the direct comparison of black hole mass measurements via the stellar and gas dynamical techniques. This necessary consistency check has so far only been attempted on a few galaxies with limited results. We will present laser guide star adaptive optics observations of NGC 3998 and NGC 4203 with the integral field spectrograph OSIRIS on the Keck II telescope. We measure high resolution stellar kinematics from the K-band CO bandheads, resolving the black hole sphere of influence. Additional large-scale observations of the stellar kinematics were taken at multiple slit positions with LRIS on the Keck I telescope and with the integral field spectrograph VIRUS-P on the 2.7m telescope at the McDonald Observatory. We will present preliminary results from the stellar dynamical modeling and constraints on the black hole masses.

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