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Quasar Black Hole Masses from Velocity Dispersions

Canalizo, Gabriela and Wold, Margrethe and Lazarova, Mariana and Lacy, Mark (2008) Quasar Black Hole Masses from Velocity Dispersions. In: OBSERVATIONAL EVIDENCE FOR BLACK HOLES IN THE UNIVERSE: Proceedings of the 2nd Kolkata Conference on Observational Evidence for Black Holes in the Universe, Kolkata India, 10–15 February 2008 and the Satellite Meeting on Black Holes, Neutron ... AIP Conference Proceedings. No.1053. American Institute of Physics , Melville, NY, pp. 63-66. ISBN 978-0-7354-0582-0.

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Much progress has been made in measuring black hole (BH) masses in (non-active) galactic nuclei using the tight correlation between stellar velocity dispersions sigma in galaxies and the mass of their central BH. The use of this correlation in quasars, however, is hampered by the difficulty in measuring sigma in host galaxies that tend to be overpowered by their very bright nuclei. We discuss results from a project that focuses on z~0.3 quasars suffering from heavy extinction at shorter wavelengths. This makes it possible to obtain clean spectra of the hosts in the spectral regions of interest, while broad lines (like Halpha) are still visible at longer wavelengths. We compare BH masses obtained from velocity dispersions to those obtained from the BLR and thus probe the evolution of this relation and BH growth with redshift and luminosity. Our preliminary results show an offset between the position of our objects and the local relation, in the sense that red quasars have, on average, lower velocity dispersions than local galaxies. We discuss possible biases and systematic errors that may affect our results.

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Additional Information:© 2008 American Institute of Physics. Issue Date: 8 October 2008. Support for this project was provided by the NSF, under grant number AST 0507450.
Funding AgencyGrant Number
NSFAST 0507450
Subject Keywords:quasars, black holes, dispersion (wave)
Series Name:AIP Conference Proceedings
Issue or Number:1053
Record Number:CaltechAUTHORS:CANaipcp08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12221
Deposited By: Archive Administrator
Deposited On:29 Oct 2008 22:00
Last Modified:19 Apr 2016 22:30

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