Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5447c&link_type=abstract
HST Proposal ID #5447
Computer Science
Hst Proposal Id #5447 Galaxies &Amp, Clusters Distant Galaxies
Scientific paper
Recent results indicate that high redshift radio galaxies are young systems rich in molecular gas and dust and undergoing substantial star formation. At redshifts z > 2, these massive galaxies are the best observational examples of ongoing galaxy formation at early epochs. Only HST can probe the complex morphology of these galaxies. Recent surveys have discovered a large number of these distant galaxies and the time is ripe for a systematic study. It will be expensive, but these distant galaxies are virtually the only optically extended objects at high redshift for HST to study. We propose WFPC2 observations of a sample of 9 galaxies, with longer integrations for 3 of the best objects. For each galaxy we propose one narrow band image centered on redshifted Lyman alpha, and two color continuum images taken with the polarizer parallel and perpenducular to the radio axis. This will enable us to determine: (i) the spatial distribution of the extended emission line gas, (ii) the morphology of the underlying stellar distribution and its color gradient, (iii) the morphology of the scattered nuclear light, its color dependance, and therefore the nature of the scattering medium. The full scientific potential of the HST observations will be realized by choosing galaxies in the diagnostic window (2.2 < z < 2.6) where we can combine this data with our ground based studies of the molecular gas content, kinematics, dust extinction, and ionization state of the gas.
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