BCG Kinematics With Osiris: Toward BH Masses

Details BCG Kinematics With Osiris: Toward BH Masses BCG Kinematics With Osiris: Toward BH Masses

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343705m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #437.05; Bulletin of the American Astronomical Society, Vol. 41, p.309

Physics

Optics

Scientific paper

We present velocity dispersion measurements from the central regions of two Brightest Cluster Galaxies (BCGs), measured with OSIRIS and demonstrating its capabilities toward producing dynamical mass estimates of super-massive black holes. OSIRIS and the Laser Guide Star Adaptive Optics system at Keck II enable two-dimensional sampling of each galaxy at a spatial scale of 50 mas, sufficient to extract multiple spectra within the sphere of influence of a 2 x 109 solar mass black hole. Kinematic data from OSIRIS is the key ingredient to non-parametric dynamical models, whose determination of MBH is a necessary tie-breaker between contradictory trends in the MBH-L and MBH-sigma relationships above 109 solar masses. Our preliminary dispersion measurements support OSIRIS as a feasible alternative to space-based slit spectroscopy for measuring black hole masses. BCGs are likely to harbor the most massive black holes in the local universe.

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