HST Imaging Observations of z 1 Radio Sources and their Radio-optical Alignments

Details HST Imaging Observations of z 1 Radio Sources and their Radio-optical Alignments HST Imaging Observations of z 1 Radio Sources and their Radio-optical Alignments

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342114c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #421.14; Bulletin of the American Astronomical Society, Vol. 41, p.240

Astronomy and Astrophysics

Astronomy

Scientific paper

Study of the host galaxies of high redshift AGN is useful to investigate a population of high redshift galaxies not selected for star formation. It is important to establish how much the AGN affects the observed properties of the host galaxies even in samples of relatively weak AGN. Today it is well-known that the radio-bright 3C radio galaxies and quasars clearly have the observed optical properties of their host galaxies strongly affected by the presence of the AGN. This is usually seen as a close correlation between the axis of the radio jet and the major axis of the optical emission, and hence is termed the 'alignment effect'. We have taken optical HST WFPC2 imaging of 4 radio galaxies and 4 radio quasars at z 1 from a flux-limited 7C radio sample. The flux density limit of the 7C survey is a factor of 20 times fainter than that of the 3C, and these data allow us to study the effects of weaker radio-loud AGN and their jets on the host galaxies of radio sources and how the alignment effect scales with radio luminosity. With this sample we can also compare the hosts of radio galaxies and radio quasars directly.

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