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Determination of the Intrinsic Scatter in the MBH–σ and MBHLbulge Relations

Published online by Cambridge University Press:  03 June 2010

Kayhan Gültekin*
Affiliation:
Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USA Email: [email protected]
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Abstract

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We derive improved versions of the relations between supermassive black hole mass MBH and host-galaxy bulge velocity dispersion σ and luminosity L (the MBH–σ and MBHLbulge relations), based on ~ 50 MBH measurements and ~ 20 upper limits. Particular attention is paid to recovery of the intrinsic scatter (ϵ0) in both relations. We find the scatter to be significantly larger than estimated in most previous studies. The large scatter requires revision of the local black hole mass function, and it implies that there may be substantial selection bias in studies of the evolution of the MBH–σ and MBHLbulge relations. When only considering ellipticals, the scatter decreases. These results appear to be insensitive to a wide range of assumptions about the measurement errors and the distribution of intrinsic scatter. We also investigate the effects on the fits of culling the sample according to the resolution of the black hole's sphere of influence.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

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