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Cosmic evolution of black holes and galaxies to z=0.4

Published online by Cambridge University Press:  01 August 2006

J.-H. Woo ,
T. Treu ,
M. A. Malkan  and
R. D. Blanford
J.-H. Woo
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 93106-9530 email: [email protected], [email protected]
T. Treu
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 93106-9530 email: [email protected], [email protected]
M. A. Malkan
Affiliation:
Department of Physics, University of California, Los Angeles, CA 90095-1547 email: [email protected]
R. D. Blanford
Affiliation:
Kavli Institute for Particle Astrophysics and Cosmology, Stanford, CA 94305 email: [email protected]
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Abstract

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We test the evolution of the correlation between black hole mass and bulge properties, using a carefully selected sample of 20 Seyfert 1 galaxies at z=0.36 ±0.01. We estimate black hole mass from the Hβ line width and the optical luminosity at 5100 Å, based on the empirically calibrated photo-ionization method. Velocity dispersion are measured from stellar absorption lines around Mgb (5175 Å) and Fe (5270 Å) using high S/N Keck spectra, and bulge properties (luminosity and effective radius) are measured from HST images by fitting surface brightness. We find a significant offset from the local relations, in the sense that bulge sizes were smaller for given black hole masses at z=0.36 than locally. The measured offset is Δ M•=0.62 ± 0.10, 0.45 ±0.13, 0.59 ±0.19, respectively for M•–σ, M•–Lbulge, and M•–Mbulge relations. At face value, this result implies a substantial growth of bulges in the last 4 Gyr, assuming that the local M•–bulge property relation is the universal evolutionary end-point. This result is consistent with the growth of black holes predating the final growth of bulges at these mass scales (〈σ〉=170 km s−1).

Keywords

Black hole physics – galaxy evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 291 - 294
Copyright
Copyright © International Astronomical Union 2007

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