Radio Source Compactness at the Milli-Jansky Level

Details Radio Source Compactness at the Milli-Jansky Level Radio Source Compactness at the Milli-Jansky Level

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360801m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #608.01

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Scientific paper

We have carried out 8 GHz VLA survey of two small fields to obtain a complete sample of radio sources with flux densities above 1 mJy. The identified sources are being observed at the VLBA at 8 GHz to determine their milli-arcsecond structure. We have also carried out VLBA observations of a complete sample with flux densities above 10 mJy. The main goals of these observations are: to determine the angular size, radio spectra and identification for a weak sample of high frequency sources; to find the fraction of sources which have sufficiently compact emission for use as calibrators for VLBI observations; and for design considerations of future DSN antennas. We find that a majority of the sources have most of their emission in a compact <1 mas radio core, and that most of the other sources have steep radio spectra.

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