Research Activities > Programs > Matter and Electromagnetic Fields in Strong Gravity

Matter and Electromagnetic Fields in Strong Gravity

CSIC Building (#406), Seminar Room 4122.
Directions: home.cscamm.umd.edu/directions


The Mass of Supermassive Black Holes:
New Scaling Relations

Kayhan Gultekin

University of Michigan


Abstract:   We derive improved versions of the relations between supermassive black hole mass (M_BH) and host-galaxy bulge velocity dispersion (sigma) and luminosity (L; the M-sigma and M-L relations), based on 49 M_BH measurements and 19 upper limits. Particular attention is paid to recovery of the intrinsic scatter in both relations. The results for ellipticals are consistent with previous studies, but the intrinsic scatter recovered for spirals is significantly larger. The scatter inferred reinforces the need for its consideration when calculating local black hole mass function based on the M-sigma relation, and further implies that there may be substantial selection bias in studies of the evolution of the M-sigma relation. We also present recent work that examines the relationship among black hole mass, X-ray luminosity, and radio luminosity of the accreting system and consider its use in estimating black hole mass.

University of Maryland    

UM Home | Directories | Calendar
Maintained by CSCAMM
Direct questions and comments to

CSCAMM is part of the
College of Computer, Mathematical & Natural Sciences (CMNS)