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Matter and Electromagnetic Fields in Strong Gravity
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Matter and Electromagnetic Fields in Strong Gravity
CSIC Building (#406),
Seminar Room 4122.
Directions: home.cscamm.umd.edu/directions
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The Mass of Supermassive Black Holes:
New Scaling Relations
Kayhan Gultekin
University of Michigan
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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.
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