HST Observations of MilliJansky Radio Sources from the FIRST Survey

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

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8382w&link_type=abstract

HST Proposal ID #8382

Physics

1

Hst Proposal Id #8382 Agn Hosts And Environment

Scientific paper

The VLA FIRST survey is planned to 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 summer of 1998 cover 6000 square degrees of sky. The source catalog from this area contains about 550, 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 is the first 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, ultraviolet, and infrared characteristics of a large sample of faint radio galaxies by analyzing all the publically available WFPC2, NICMOS, and STIS images in the HST Data Archive that contain cataloged FIRST sources.

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