A sensitive 1.5 GHz radio survey around the north ecliptic pole

Details A sensitive 1.5 GHz radio survey around the north ecliptic pole A sensitive 1.5 GHz radio survey around the north ecliptic pole

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...93..145k&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 93, no. 1, p. 145-159

Astronomy and Astrophysics

Astronomy

24

Astronomical Catalogs, Northern Sky, Radio Astronomy, Radio Sources (Astronomy), Sky Surveys (Astronomy), Flux Density, Very Large Array (Vla)

Scientific paper

A 29.3 sq deg region surrounding the north ecliptic pole (NEP; alpha = 18h00m, delta = +66 deg 30 min) was mapped with the Very Large Array at 1.5 GHz to support the deepest portion of the ROSAT all-sky soft X-ray survey. The resulting VLA-NEP survey catalog contains 2435 radio sources with flux densities in the range of 0.3-1000 mJy, including over 200 fainter than 1 mJy. The 28 fields of the inner 1.5 deg have noise levels sigma approximately equals 60 mu-Jy, and the 85 fields centered between 1.5 and 3.0 deg from the NEP have sigma approximately equals 120 mu-Jy. The typical spatial resolution is 20 sec HPBW, and most positions are accurate to less than 2 sec. Approximately 6% of the sources are found to be extended with size greater than 30 sec. We have compared the VLA-NEP catalog with four other radio catalogs made at lower resolution, as well as with the NASA Extragalactic Database and find counterparts for approximately 18% of the VLA-NEP objects. The normalized, differential radio source count is in agreement with previous studies. Between 1 and 150 mJy the slope of the log N-log S relation is 0.68 +/- 0.03. The catalog and related tables are available electronically.

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