Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The LOFAR Multifrequency Snapshot Sky Survey (MSSS) I. Survey
  description and first results   We present the Multifrequency Snapshot Sky Survey (MSSS), the first
northern-sky LOFAR imaging survey. In this introductory paper, we first
describe in detail the motivation and design of the survey. Compared to
previous radio surveys, MSSS is exceptional due to its intrinsic multifrequency
nature providing information about the spectral properties of the detected
sources over more than two octaves (from 30 to 160 MHz). The broadband
frequency coverage, together with the fast survey speed generated by LOFAR's
multibeaming capabilities, make MSSS the first survey of the sort anticipated
to be carried out with the forthcoming Square Kilometre Array (SKA). Two of the
sixteen frequency bands included in the survey were chosen to exactly overlap
the frequency coverage of large-area Very Large Array (VLA) and Giant Metrewave
Radio Telescope (GMRT) surveys at 74 MHz and 151 MHz respectively. The survey
performance is illustrated within the "MSSS Verification Field" (MVF), a region
of 100 square degrees centered at J2000 (RA,Dec)=(15h,69deg). The MSSS results
from the MVF are compared with previous radio survey catalogs. We assess the
flux and astrometric uncertainties in the catalog, as well as the completeness
and reliability considering our source finding strategy. We determine the 90%
completeness levels within the MVF to be 100 mJy at 135 MHz with 108"
resolution, and 550 mJy at 50 MHz with 166" resolution. Images and catalogs for
the full survey, expected to contain 150,000-200,000 sources, will be released
to a public web server. We outline the plans for the ongoing production of the
final survey products, and the ultimate public release of images and source
catalogs.

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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph