The Very Large Array Low-frequency Sky Survey Redux (VLSSr)

By W. Lane, W. Cotton, S. Velzen, T. Clarke, N. Kassim, J. Helmboldt, T. Lazio, A. Cohen. 2014

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We present the results of a recent re-reduction of the data from the Very Large Array (VLA) Low-frequency Sky Survey (VLSS). We used the VLSS catalog as a sky model to correct the ionospheric distortions in the data and create a new set of sky maps and corresponding catalog at 73.8 MHz. The VLSS Redux (VLSSr) has a resolution of 75 arcsec, and an average map RMS noise level of σ � 0.1 Jy beam 1 . The clean bias is 0.66 × σ and the theoretical largest angular size is 36 arcmin. Six previously unimaged fields are included in the VLSSr, which has an unbroken sky coverage over 9.3 sr above an irregular southern boundary. The final catalog includes 92,964 sources. The VLSSr improves upon the original VLSS in a number of areas including imaging of large sources, image sensitivity, and clean bias; however the most critical improvement is the replacement of an inaccurate primary beam correction which caused source flux errors which vary as a function of radius to nearest pointing center in the VLSS.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c9d3349650bb9a633aebff21e9a1a194cad51c60

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Citations in the corpus

The Rapid ASKAP Continuum Survey I: Design and first results (2020, background): “…radio surveys with substantial Southern-sky coverage in themetric and decimetric bands: Very Large Array Low-frequency Sky Survey Redux (VLSSr; Lane et al. 2014), Galactic and Extragalactic All-sky Murchison Widefield Array survey (GLEAM; Wayth et al. 2015; HurleyWalker et al. 2017; Lenc et…”
GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey - I. A low-frequency extragalactic catalogue (2016, methodology): “Recent low-frequency surveys using these established and new telescopes include: the VLA Low-frequency Sky Survey Redux at 74 MHz (VLSSr; Lane et al. 2014), the Multi-Snapshot Sky Survey at 120–180 MHz (MSSS; Heald et al. 2015), the Tata Institute for Fundamental Research GMRT Sky Survey at 150 MHz…”
LOFAR 150-MHz observations of the Boötes field: catalogue and source counts (2016, background): “…178, 151, and 151 MHz, respectively (Edge et al. 1959; Bennett 1962; Pilkington & Scott 1965; Gower, Scott & Wills 1967; Hales, Baldwin & Warner 1988; Hales et al. 2007), the UTR-2 sky survey between 10 and 25 MHz (Braude et al. 2002), and the VLSS at 74 MHz (Cohen et al. 2007; Lane et al. 2014).”
The GMRT 150 MHz all-sky radio survey - First alternative data release TGSS ADR1 (2016, background): “Refinement of the primary beam model is not uncommon while doing low-frequency surveys (e.g., Lane et al. 2014).”
The LOFAR Two-metre Sky Survey. I. Survey description and preliminary data release (2016, background): “…MSSS (Heald et al. 2015), GaLactic and Extragalactic All-sky MWA (GLEAM; Wayth et al. 2015) and the Very Large Array Low-frequency Sky Survey Redux (VLSSr; Lane et al. 2014), the 120-168 MHz LoTSS will be at least a factor of 50-1000 more sensitive and 5-30 times higher in resolution (see Table 1).”