HST WFPC2 Observations of MilliJansky Radio Sources from the FIRST Survey

Details HST WFPC2 Observations of MilliJansky Radio Sources from the FIRST Survey HST WFPC2 Observations of MilliJansky Radio Sources from the FIRST Survey

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7548w&link_type=abstract

HST Proposal ID #7548

Physics

Hst Proposal Id #7548 Agn/Quasars

Scientific paper

The VLA FIRST survey will cover 10,000 square degrees of the North and South Galactic Caps at 1.4 GHz to a peak flux density limit of 1 mJy with an angular resolution of 5" and source positions better than 1" down to the catalog detection limit. Data taken through the end of 1995 have been fully reduced and cover 3000 square degrees of sky; data being taken from January to April 1997 will extend this coverage to 5000 square degrees by the early part of HST Cycle 7. The source catalog from this area will contain about 450,000 objects. The median optical brightness of mJy radio galaxies is V 23.5. The number of magnitude 23.5 galaxies per square degree is large { 2.5*10^4 hboxdeg^-2}, so that our positions of <1" accuracy are required to identify the optical counterparts with confidence. The FIRST survey has been designed to be the first large area radio survey with positions accurate enough to identify and study the faint optical counterparts for the majority of the sources. Of course, these galaxies are not only faint; they are also of small angular size and often have point-like, active nuclei. Only HST has the angular resolution required to study the morphology and evolution of these objects. We propose to study the optical characteristics of a large sample of faint radio galaxies by analyzing all the publically available WFPC2 images in the HST Data Archive that contain cataloged FIRST sources.

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