Host Galaxies of Quasars
Properties of host galaxies of low redshift quasars are reviewed. There is good evidence that radio-loud quasars sit in bright elliptical galaxies, whereas optical and X-ray quasars reside in spiral galaxies. The host galaxies of radio-loud quasars are brighter by ∼ 2 mag than those of radio-quiet ones; the brightest ones have luminosities comparable to those of brightest cluster galaxies. The neighborhood of quasars has higher than average galaxy density; tidal interactions with the host galaxies are frequently observed.
A preliminary analysis of a survey of 15 radio-loud quasars with redshifts from 0.3 to 3.4 yields the result expected for cosmological redshifts that host galaxies and neighboring galaxies are detected only for the low-redshift objects.
Very deep surfacephotometry of 2 radio-loud low-redshift quasars shows that in one case (1635+119, z = 0.146) the host galaxy can very well be fitted by an elliptical galaxy over 3 orders in intensity; the host galaxy of 4C14.83 (z = 0.237) is strongly asymmetric and can not be well fitted by either elliptical or spiral galaxy.
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