Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.1070l&link_type=abstract
HST Proposal ID #1070
Physics
Hst Proposal Id #1070 Galaxies &Amp, Clusters
Scientific paper
Recent ground-based observations of the colours and magnitudes of 3C radio galaxies at z ~ 1 have enabled a picture of the evolution of the stellar populations of these galaxies to be constructed. Some galaxies show only the effects of the passive evolution of the main sequence turn-off point, while a substantial fraction show evidence of addition- al susbtantial populations of young stars in an actively evolving stellar population. Ground based observations indicate that this range of evolutionary behavior is maintained at least to z ~ 2, but little progress has been possible in understanding the star-formation activity seen in a fraction of these galaxies at all redshifts z >/~ 0.7. It is proposed to take two-colour deep high-resolution images of a well-defined sample of 22 3C galaxies with 0.6 < z < 1.30 and single- colour exposures of an additional 6 galaxies at z > 1.3, using the WFPC2. These will allow the morphologies and structures of both act- ively and passively evolving galaxies to be determined, allow the distribution of star-forming regions in the galaxies to be mapped and the cause of this activity to be understood. The data will also allow the nearby cluster environments of the galaxies to be studied.
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