Nuclear to host galaxy relation of high redshift quasars

: Kotilainen JK

: The Nuclear Region, Host Galaxy and Environment of Active Galaxies

: 2008

: REV MEX AST ASTR

: Revista Mexicana de Astronomia y Astrofisica Serie de Conferencias

: 32

: 158

: 160

: 3

: 978-970-32-5297-8

: 1405-2059

: http://www.astroscu.unam.mx/~rmaa/rmsc32_frameset.html

We present near-infrared imaging of quasars at 1 < z < 2, covering a large range (similar to 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.