Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Very Large Array Low-frequency Sky Survey Redux (VLSSr)   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
$\sigma\sim0.1$ Jy beam$^{-1}$. The clean bias is $0.66\times\sigma$, and the
theoretical largest angular size is 36 arcmin. Six previously un-imaged 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.

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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: math