Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A New Radio Continuum Survey of the Sky at 1465 MHz between declinations
  -52 degrees and +68 degrees   We have mapped the total sky brightness at 1465 MHz in two adjacent 60-degree
declination bands with the portable 5.5-m parabolic reflector of the Galactic
Emission Mapping (GEM) project, an on-going international collaboration to
survey the radio continuum of the sky in decimeter and centimeter wavelengths.
The observations were conducted from two locations, one in the USA and the
other in Brazil, using a novel instrumental approach to overcome the well-known
shortcomings of survey experiments. Our strategy consists of a 1-rpm rotating
dish to circularly scan the sky at 30 degrees from zenith. The dish uses a
rim-halo to re-direct the spillover sidelobes of its backfire helical feed
toward the sky and the entire assembly has been enclosed inside a wire mesh
ground shield in order to minimize and level out the contamination from the
ground. The diffraction characteristics of this set-up have been succesfully
modelled and undesired systematic striping across the observed bands has been
carefully removed by a baseline propagation method which exploits the
time-forward and time-backward intersections of the circular scans. The map
displays nearly 300 hours of our best quality data taken with a HPBW of 5.4
degrees at a sensitivity of 20 mK.

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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph