HST Observations of MilliJansky Radio Sources from the VLA FIRST Survey

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

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10640b&link_type=abstract

HST Proposal ID #10640

Physics

Hst Proposal Id #10640 Galaxies

Scientific paper

The VLA FIRST survey has imaged 9, 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 arcsec and source positions better than 1 arcsec down to the catalog detection limit. The source catalog from this area contains about 900, 000 objects. The median optical brightness of mJy radio galaxies is approximately 23.5. The number of magnitude 23.5 galaxies per square degree is large {2.5 x 10^4 deg^-2}, so that positions of <1 arcsec accuracy are required to identify the optical counterparts with confidence. The FIRST survey is the only wide 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 usually 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 publicly available ACS images in the HST Data Archive that contain cataloged FIRST sources.

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