NOAO >   Observing Info >   Approved Programs >   2008A-0458

Small NOAO Logo

Proposal Information for 2008A-0458


PI: Joe Helmboldt, Naval Research Laboratory, Joe.Helmboldt@nrl.navy.mil
Address: Remote Sensing Division, 4555 Overlook Ave, Sw, Washington, DC 20375, USA

CoI: Aaron Cohen, Naval Research Laboratory
CoI: Namir Kassim, Naval Research Laboratory
CoI: Wendy Lane, Naval Research Laboratory
CoI: T. Joseph Lazio, Naval Research Laboratory

Title: Redshifts of Sources from the VLA Low-frequency Sky Survey

Abstract: 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 \nu < 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.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2008A-0458

noaoprop-help@noao.edu

Small NOAO Logo