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Cosmic Evolution of Quasar Host Galaxies

Published online by Cambridge University Press:  01 August 2006

D. Floyd ,
M. Kukula ,
J. Dunlop ,
R. McLure ,
C. O'Dea  and
S. Baum
D. Floyd*
Affiliation:
STScI, USA
M. Kukula
Affiliation:
STScI, USA
J. Dunlop
Affiliation:
STScI, USA
R. McLure
Affiliation:
ROE, UK
C. O'Dea
Affiliation:
STScI, USA
S. Baum
Affiliation:
RIT, USA
*
†email: floyd@stsci.edu
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Abstract

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Using HST WFPC2 and NICMOS observations, and our 2D image weighting and modelling technique (Floyd et al. 2004), we have reliably disentangled host from nucleus for nine optically matched radio-loud quasars (RLQ) and nine radio-quiet quasars (RQQ) at z = 1&2, in two bands spanning the 4000Å break. The resulting galaxy colours provide the first unbiased estimates of galaxy mass for a statistical sample of quasars at high redshift, and indicates a difference in the evolution of radio-loud and radio-quiet objects.

Keywords

galaxies: activegalaxies: fundamental parameters(galaxies:) quasars: general

References

Dunlop, J. S. 2003, MNRAS 340, 1095Google Scholar
Floyd, D. J. E. 2004, MNRAS 355, 196Google Scholar