The 7c Survey of Radio Sources at 151-MHZ - a Search for Low-Frequency Variability

Details The 7c Survey of Radio Sources at 151-MHZ - a Search for Low-Frequency Variability The 7c Survey of Radio Sources at 151-MHZ - a Search for Low-Frequency Variability

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246..123m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 246, NO. 1/SEP1, P. 123, 1990

Astronomy and Astrophysics

Astronomy

13

Scientific paper

Variability in the 151-MHz flux density of radio sources, on a time-scale of 1 yr, has been investigated using the Cambridge Low Frequency Synthesis Telescope in a complete sample of 811 unresolved sources with S_151_ > 0.3 Jy. The wide field of view of the telescope permits simultaneous observations of ~150 sources above ~0.3 Jy and enables relative calibration of observations at two epochs to better than 1 per cent on the assumption that there is no systematic variability in the sample. Less than 1.1 per cent of the sample show fractional variability at a level of > 15 per cent; no sources with S_151_ > 3 Jy show fractional variability at a level > 4 per cent. The variability of individual sources is considered by making difference maps. Only two sources in the entire sample show significant variability.

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