A complete sample of radio sources in the North Ecliptic Cap, selected at 38 MHz. I - The radio data

Details A complete sample of radio sources in the North Ecliptic Cap, selected at 38 MHz. I - The radio data A complete sample of radio sources in the North Ecliptic Cap, selected at 38 MHz. I - The radio data

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..404l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 3, June 1, 1992, p. 404-424.

Astronomy and Astrophysics

Astronomy

23

Active Galaxies, Radio Astronomy, Radio Sources (Astronomy), Sky Surveys (Astronomy), Very Large Array (Vla), Quasars, Stellar Luminosity

Scientific paper

Using the 38-MHz 8C survey by Rees, a complete sample of 57 radio sources was constructed to a flux density limit of S38 = 1.3 Jy within 3.03 deg of the North Ecliptic Pole. This is the lowest frequency at which such a sample has been defined. All of the members of the sample have been mapped at arcmin resolution with the CLFST, and at arcsec resolution with either the VLA or the Ryle Telescope. Radio structures, high-frequency spectral indices and angular sizes of this 8C sample are broadly similar to those of the brighter 151-MHz 6C sample by Eales, indicating that distant (z greater than 0.5) radio-luminous FRII Fanaroff and Riley (1974), sources continue to dominate the steep-spectrum source population at flux densities just below the peak of the radio source counts. Small differences in radio properties between the 8C and 6C samples can be explained by their different selection frequencies, and, in particular, by the loss of physically small sources with spectral turnovers in the ultralow frequency selected sample.

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