Quasar hosts: differences between radio-loud and radio-quiet galaxies

Details Quasar hosts: differences between radio-loud and radio-quiet galaxies Quasar hosts: differences between radio-loud and radio-quiet galaxies

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003newar..47..215k&link_type=abstract

New Astronomy Reviews, Volume 47, Issue 4-5, p. 215-218.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Strong evidence exists that radio-loud quasars and FRII radio galaxies differ only in the orientation of their central AGN, and HST studies of quasar hosts have confirmed that there are no significant differences between radio galaxies and the massive elliptical galaxies which host RLQs. Detailed studies of radio-quiet quasars show that these powerful AGN are also hosted almost exclusively by massive elliptical galaxies, leaving us with the question of why only a small fraction of active ellipticals are capable of producing powerful radio sources. Evidence is mounting that the elliptical hosts of RQQs are not identical to the host galaxies of radio-loud AGN, particularly at high redshifts. This paper summarises the results to date of a major HST program designed to investigate the luminosities, morphologies and colours of radio-loud and radio-quiet quasar hosts out to redshifts of /~2.

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