The VLA Low-frequency Sky Survey

Details The VLA Low-frequency Sky Survey The VLA Low-frequency Sky Survey

2007-06-08

arxiv.org/abs/0706.1191v1

Astron.J.134:1245-1262,2007

Astronomy and Astrophysics

Astrophysics

53 pages, including 3 tables and 15 figures. Has been accepted for publication in the Astronomical Journal

Scientific paper

10.1086/520719

The Very Large Array (VLA) Low-frequency Sky Survey (VLSS) has imaged 95% of the 3*pi sr of sky north of declination = -30 degrees at a frequency of 74 MHz (4 meter wavelength). The resolution is 80" (FWHM) throughout, and the typical RMS noise level is ~0.1 Jy/beam. The typical point-source detection limit is 0.7 Jy/beam and so far nearly 70,000 sources have been catalogued. This survey used the 74 MHz system added to the VLA in 1998. It required new imaging algorithms to remove the large ionospheric distortions at this very low frequency throughout the entire ~11.9 degree field of view. This paper describes the observation and data reduction methods used for the VLSS and presents the survey images and source catalog. All of the calibrated images and the source catalog are available online (http://lwa.nrl.navy.mil/VLSS) for use by the astronomical community.

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