Physics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8768w&link_type=abstract
HST Proposal ID #8768
Physics
Hst Proposal Id #8768 Agn/Quasars
Scientific paper
We propose to investigate the optical morphologies of 300 faint radio sources using archival HST images. Using the FIRST survey and several deep VLA fields, we will assemble a sample of radio sources spanning five orders of magnitude in radio flux from 10^-5 Jy to 1 Jy at 1.4 GHz, that have WFPC2 F606W/F814W images available in the archive. We will then use this sample to achieve the following goals: hbox{square}uare Determine the radio source counts as a function of optical morphology and radio flux density, allowing us to differentiate the various galaxy types that make up the faint radio source population. hbox{square}uare Determine the fraction of faint radio sources that have no optical counterpart to I eq 25-27. Such objects must either be heavily obscured by dust, or be at very high redshift, or be high-redshift dusty sources. We previously found several such objects in the HDF-N. hbox{square}uare Determine the extent to which weak radio galaxies have their optical emission aligned with their radio axis, as is typical of powerful radio galaxies at z> 0.6. hbox{square}uare Investigate the environments of faint radio sources. The radio emission from microjansky sources is attributed to high star formation rates in these galaxies -- we will be able to determine what fraction of these starbursts are caused by interactions or mergers.
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