Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008rmxac..32..158k&link_type=abstract
The Nuclear Region, Host Galaxy and Environment of Active Galaxies (Eds. Erika Benítez, Irene Cruz-González, & Yair Krongold) Re
Astronomy and Astrophysics
Astronomy
Galaxies: Active, Galaxies: Evolution, Infrared: Galaxies, Quasars: General
Scientific paper
We present near-infrared imaging of quasars at 1 < z < 2, covering a large range (˜ 4 mag) of quasar luminosity function. The host galaxies of both radio-loud (RLQ) and radio-quiet (RQQ) quasars have luminosities in the range of massive inactive ellipticals, between L* and 10 L*. RLQ hosts are more luminous than RQQ hosts. This luminosity gap is independent of rest-frame U-band luminosity but correlated with rest-frame R-band luminosity. This color difference between RLQs and RQQs is likely a combination of an intrinsic difference in their SEDs, and a selection effect due to internal dust extinction. There is a reasonable correlation between the nuclear and host luminosities for RLQs but not for RQQs. If the R-band traces the bolometric luminosity, and if the host luminosity is proportional to the black hole mass, high redshift quasars emit with a narrow range of power with respect to their Eddington luminosity.
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