A confusion-limited extragalactic source survey at 4.755 GHz. III - Accurate positions and optical identifications

Details A confusion-limited extragalactic source survey at 4.755 GHz. III - Accurate positions and optical identifications A confusion-limited extragalactic source survey at 4.755 GHz. III - Accurate positions and optical identifications

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87..219c&link_type=abstract

Astronomical Journal, vol. 87, Feb. 1982, p. 219-241.

Astronomy and Astrophysics

Astronomy

12

Quasars, Radio Astronomy, Radio Galaxies, Spatial Distribution, Tables (Data), Antenna Arrays, Astronomical Maps, Luminosity, Radio Spectra, Radio Telescopes, Red Shift

Scientific paper

Accurate positions of sources stronger than 15 mJy at 4.755 GHz, from a survey covering almost 0.01 sr of extragalactic sky, were measured with the VLA. Optical identifications were made from the PSS prints on the basis of position coincidence alone. The spectral index alpha(1.415, 4.755) distributions of the identified QSOs and galaxies are significantly different from the corresponding distributions of strong-source identifications. The relative scarcity of faint flat-spectrum (alpha values less than +0.5) QSOs is probably caused by source evolution which cuts off at a high (z value greater than 3) redshift, while the lack of faint galaxies with alpha values equal to or greater than +0.8 results from the spectral index-luminosity correlation of radio galaxies and the limited sensitivity of the PSS prints. The areal densities of optically selected and radio-selected QSOs brighter than +19.5 were compared, and both can be represented by a single, smoothly varying function of flux density.

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