A deep Westerbork survey of areas with multicolor Mayall 4 M plates. II - Optical identifications

Details A deep Westerbork survey of areas with multicolor Mayall 4 M plates. II - Optical identifications A deep Westerbork survey of areas with multicolor Mayall 4 M plates. II - Optical identifications

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26as...58...39w&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 58, Oct. 1984, p. 39-87. Sponsorship: Nederlandse Organisati

Astronomy and Astrophysics

Astronomy

76

Astrometry, Optical Emission Spectroscopy, Radio Galaxies, Radio Sources (Astronomy), Size Distribution, Astronomical Photography, Cosmology, Magnitude, Photographic Plates, Quasars, Radiant Flux Density, Sky Surveys (Astronomy), Stellar Color

Scientific paper

In the cases of 171 out of the 302 radio sources observed with the Westerbork Synthesis Radio Telescope, for which a deep, multicolor optical identification program has been conducted, likely identifications are proposed with an a posteriori identification percentage of 53 percent. About 20 percent of the identifications are stellar objects, and an additional 15 percent appear in possible clusters. The identification fraction is presented as a function of 21-cm flux density and limiting magnitude; it amounts to 15 percent for S 1.4 GHz values of 1-100 mJy, down to the Palomar Sky Survey limit, and 29 percent down to the effective 48-arcsec Schmidt limit. The magnitude distributions for galaxies, plus objects of unknown type, generally increase towards fainter magnitudes. The quasar magnitude distributions are also increasing, but not as steeply as for the radio galaxies.

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