Evolution of the Black Hole Mass - Galaxy Bulge Relationship for Quasars in the Sloan Digital Sky Survey Data Release 7

Details Evolution of the Black Hole Mass - Galaxy Bulge Relationship for Quasars in the Sloan Digital Sky Survey Data Release 7 Evolution of the Black Hole Mass - Galaxy Bulge Relationship for Quasars in the Sloan Digital Sky Survey Data Release 7

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943503s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #435.03

Astronomy and Astrophysics

Astronomy

Scientific paper

We investigate evolution in the relationship between black hole mass and host galaxy velocity dispersion for a sample of QSOs from the Sloan Digital Sky Survey Data Release 7. Due to the lack of resolution and the high luminosity of our QSOs, we use surrogates for the black hole and galaxy properties. We use the broad Hβ emission line and the QSO continuum to estimate the black hole mass, and the narrow [O III] emission line as a proxy for the host galaxy velocity dispersion. This allows us to probe the relationship to redshift z = 0.8. For higher redshifts, we use Mg II and [O II] in place of Hβ and [O III], respectively, which increases our redshift range to z 1.2. The large number of QSOs in our sample allows us to investigate the black hole mass - host galaxy velocity dispersion relationship for separate black hole mass bins. We find no significant evolution in the relationship for all but the highest black hole mass bin, which includes QSOs with log black hole mass > 9.0. The highest-mass bin shows about a factor of three evolution in the redshift range 0.5 < z < 1.2, in the sense that black holes become increasingly more massive compared with the mass predicted by the velocity dispersion and the local black hole mass - host galaxy velocity dispersion relationship.

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