Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8173b&link_type=abstract
HST Proposal ID #8173
Physics
Hst Proposal Id #8173 Agn Hosts And Environment
Scientific paper
The galaxies associated with powerful distant radio sources are the most massive ellipticals known at early cosmic epochs, and are also uniquely important for understanding the physics of AGN and the interactions between the radio source and its environment. Our HST observations of a complete sample of powerful 3CR radio galaxies at redshift z ~ 1 reveal detailed small--scale structures aligned along the radio axis of these sources. In combination with deep emission line studies, we have shown that the properties of the host galaxies change dramatically throughout the lifetime of the radio source, being dominated in the small sources by the effects of the shocks associated with the radio activity. To allow quantitative measurements of the on-going physical processes and the nature of the surrounding environment, the importance of the radio beam power must be determined. To tackle this issue, in cycle 6 we began a project using WFPC2, imaging 5 galaxies from a complete sub sa mple of 11 lower radio power 6C sources. The first results show that the 6C galaxies also possess aligned optical emission, but at lower flux densities than the 3CR galaxies. Comparison with our new VLA data shows radio--optical correlations on kpc scales. We now propose to finish the WFPC2 observations of our complete VLA subsample. This larger sample of galaxies over a wide range of radio sizes will allow an investigation of the evolution of the host galaxy properties following the passage of lower power radio jets.
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