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

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

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204..289f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, July 1983, p. 289-315. Research supported by Cambr

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27

Astronomical Spectroscopy, Extragalactic Radio Sources, Radiant Flux Density, High Resolution, Red Shift, Size Distribution, Spectral Energy Distribution

Scientific paper

High-resolution radio observations of 37 5C12 and four 5C7 sources are presented which, together with other sources from 5C6 and 7, comprise two overlapping samples complete to 20 mJy at 1407 MHz (35 sources) and in the flux density range 0.1-1 Jy at 408 MHz (43 sources). The data indicate that many of the sources lie at redshifts greater than or approximately equal to 1, while the median angular sizes for the two samples are 7 and 7.5 arcsec respectively, with the distributions extending up to approximately 2 arcmin at both frequencies. A comparison is presented of the observed angular sizes and the predictions of models of evolution of the radio-source population, using as alternative parent populations the 178 MHz 3CR sample and a sample of bright sources at 2700 MHz. The best fits for the flux density range 0.05-1 Jy at 408 MHz are obtained for linear size evolution as (1 + z) exp -1.0 to -1.5, although a good fit is obtained for no linear size evolution in an empty universe when the 2700 MHz parent sample is used. The quality of the fits is found not to depend upon the form of the evolving radio luminosity functions. It is concluded that the presently available data do not determine whether linear size evolution is required.

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