Journal Article

Mass-dependent evolution of the relation between the supermassive black hole mass and host spheroid mass since <i>z</i>∼ 1

Shota Kisaka and Yasufumi Kojima

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 405, issue 2, pages 1285-1292
Published in print June 2010 | ISSN: 0035-8711
Published online June 2010 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2010.16530.x
Mass-dependent evolution of the relation between the supermassive black hole mass and host spheroid mass since z∼ 1

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We investigate the evolutions of supermassive black hole mass (MBH) and host spheroid mass (Msph) in order to track the history of the MBHMsph relationship. The typical mass increase in MBH is calculated by a continuity equation and accretion history, which is estimated from the active galactic nucleus luminosity function. The increase in Msph is also calculated by using a continuity equation and a star formation model, which uses observational data for the formation rate and stellar mass function. We find that the black hole to spheroid mass ratio is expected to be substantially unchanged since z∼ 1.2 for high mass objects (MBH > 108.5 M and Msph > 1011.3 M). In the same redshift range, the spheroid mass is found to increase more rapidly than the black hole mass if Msph > 1011 M. The proposed mass-dependent model is consistent with the current available observational data in the MBHMsph diagram.

Keywords: black hole physics; galaxies: active; galaxies: evolution; quasars: general

Journal Article.  4939 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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