Titlebook: QSO Hosts and Their Environments; Isabel Márquez,Josefa Masegosa,Josefina Molina Book 2001 Springer Science+Business Media New York 2001 P

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The Hosts Galaxies of Radio-Loud and Radio-Quiet Quasarsxt of the general galaxy population. It is now clear that the hosts of radio-loud . radio-quiet quasars with . . < ?23.5 are virtually all massive elliptical galaxies. The masses of these spheroids are as expected given the relationship between black-hole and spheroid mass found for nearby quiescent

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The Nucleus-Host Galaxy Connection in Radio-Loud AGNconsists of 57 objects, divided into sub-samples of 40 BL Lac objects and 17 RL quasars. Essentially all the AGN nuclei lie in luminous elliptical galaxies (Es), which follow the Kormendy relation for normal Es. The host galaxies occupy a narrow range of ~1 magnitude, compared to >5 orders of magnit

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The Radio Loudness Dichotomy: Environment or Black-Hole Mass?asars are presented. No evidence is found for a difference in large-scale environments, with both quasar classes found to be located in clusters of Abell class ~ 0. Conversely, virial black-hole mass estimates based on H. line-widths show a clear difference in the quasar black-hole mass distribution

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QSO Environments at Intermediate Redshifts Our observations include images of background control fields to provide a good determination of the field galaxy counts. About 10 per cent of the quasars appear to live in rich clusters, whereas approximately 45 per cent live in environments similar to that of field galaxies..The richness of galaxi