Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1064c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, April 1989, p. 1064-1073, 1260-1262.
Astronomy and Astrophysics
Astronomy
159
Astronomical Maps, Radio Astronomy, Sky Surveys (Astronomy), C Band, Calibrating, Continuous Spectra, Data Reduction, Power Spectra
Scientific paper
The new seven beam receiver and lateral-focus corrector were used on the NRAO 91 m telescope during October 1987 to make a total-power survey of the declination band delta between 0 and + 75 deg at 4.85 GHz. The data were reduced with AIPS to yield sky maps covering 6.0 sr with 3.7 arcmin x 3.3 arcmin resolution. The rms map noise is 5 mJy, about five times greater than the rms confusion level. There are 10,000 sources/sr stronger than 25 mJy, and their rms position uncertainties in each coordinate range from 10 arcsec for the stronger sources to 30 arcsec for the weakest sources observed near the sun. These maps are available on FITS tapes for further analysis, and a list of discrete sources is being prepared. Repeat surveys have been made to reduce the noise level and position uncertainties and to identify variable or transient sources. Future surveys with the NRAO 43 m telescope will extend the sky coverage to the southern hemisphere.
Broderick John J.
Condon James J.
Seielstad George A.
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