High-resolution observations of faint radio sources and the angular size-flux density relation

Details High-resolution observations of faint radio sources and the angular size-flux density relation High-resolution observations of faint radio sources and the angular size-flux density relation

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..593d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 197, Nov. 1981, p. 593-626.

Astronomy and Astrophysics

Astronomy

28

Angular Distribution, Radiant Flux Density, Radio Observation, Radio Sources (Astronomy), Astronomical Maps, High Resolution, Radio Spectra, Very Large Array (Vla)

Scientific paper

Observations are presented of 40 5C sources which make up two samples complete to 15 mJy at 1407 MHz and 55 mJy at 408 MHz, respectively. These high-resolution observations, made with the NRAO Very Large Array and the Cambridge 5-km telescope, are used to define the angular size distribution of radio sources at low flux densities. Median angular sizes of 5-10 arcsec at 1407 MHz and 10-15 arcsec at 408 MHz are found, though the distributions extend to significantly larger angular sizes at both frequencies. These small values are compared with predictions of evolution models from the literature, and it is suggested that the small values result because many of the 5C sources are similar to those observed in high-frequency surveys rather than to 3CR sources. New flux density measurements at 2.7, 5, and 10.6 GHz are used to define the spectra of some sources over a wide frequency range.

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