Quasar black hole masses from velocity dispersions

Gabriela Canalizo, Margrethe Wold, Mariana Lazarova, Mark Lacy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Much progress has been made in measuring black hole (BH) masses in (non-active) galactic nuclei using the tight correlation, between stellar velocity dispersions σ 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 Ha) 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.

Original languageEnglish (US)
Title of host publicationObs. Evid. for Black Holes in the Universe - Proc. of the 2nd Kolkata Conf. on Obs. Evid. for Black Holes in the Universe, Kolkata, India, 10-15 Febr. 2008 and the Satell. Meet. on Black Holes, ...
Pages63-66
Number of pages4
DOIs
StatePublished - 2008
Event2nd Kolkata Conference on Observational Evidence for Black Holes in the Universe and the Satellite Meeting on Black Holes, Neutron Stars, and Gamma-Ray Bursts - Kolkata, India
Duration: Feb 10 2008Feb 17 2008

Publication series

NameAIP Conference Proceedings
Volume1053
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other2nd Kolkata Conference on Observational Evidence for Black Holes in the Universe and the Satellite Meeting on Black Holes, Neutron Stars, and Gamma-Ray Bursts
CountryIndia
CityKolkata
Period2/10/082/17/08

Keywords

  • Black hole physics
  • Galaxies: active
  • Quasars: general

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Canalizo, G., Wold, M., Lazarova, M., & Lacy, M. (2008). Quasar black hole masses from velocity dispersions. In Obs. Evid. for Black Holes in the Universe - Proc. of the 2nd Kolkata Conf. on Obs. Evid. for Black Holes in the Universe, Kolkata, India, 10-15 Febr. 2008 and the Satell. Meet. on Black Holes, ... (pp. 63-66). (AIP Conference Proceedings; Vol. 1053). https://doi.org/10.1063/1.3009525