Redshifts of Sources from the VLA Low-frequency Sky Survey

Details Redshifts of Sources from the VLA Low-frequency Sky Survey Redshifts of Sources from the VLA Low-frequency Sky Survey

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..458h&link_type=abstract

NOAO Proposal ID #2008A-0458

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Scientific paper

The nearly completed VLA Low-frequency Sky Survey (VLSS) has produced one of the largest catalogs of low-frequency radio sources. With over 68,000 74 MHz sources, the VLSS provides the best and/or only flux density measurements at frequencies <100 MHz for thousands of sources. Combining this new data with other surveys will allow for the best measurement of the luminosity function for extragalactic radio sources for ν < 100 MHz as well as the best statistical constraint on the typical shape of these sources' rest-frame radio frequency spectra. However, this cannot be achieved without distance/redshift data. From optical surveys such as the Sloan Digital Sky Survey, a small fraction (on the order of a few percent) of VLSS sources have known redshifts, and these are biased toward optically bright sources. We are proposing a small pilot program to obtain optical spectra of 61 VLSS sources with the KPNO 2.1-m telescope to determine the feasibility and success rate of a larger follow-up redshift survey of a representative sample of VLSS sources.

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