Radio variability in a complete sample of extragalactic sources at 151 MHz

Details Radio variability in a complete sample of extragalactic sources at 151 MHz Radio variability in a complete sample of extragalactic sources at 151 MHz

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..893r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 4, p. 893-902.

Astronomy and Astrophysics

Astronomy

15

Extragalactic Radio Sources, Flux Density, Variability, Active Galaxies, Astronomical Catalogs, Quasars, Radiative Transfer

Scientific paper

Variability in the 151-MHz flux density of radio sources is investigated on time scales of 1 and 5 yrs using a sample of about 1050 sources with X(151) over 0.3 Jy. A strong correlation between variability and radio spectra properties is found. Variability is rare (0.5-1 percent) among steep spectrum sources except among those sources whose spectra turn over at about 400 MHz. Among these, 25 percent are variable on a time scale of 1 yr. An even higher proportion of the flat-spectrum population is variable, with up to 40 percent of the sources varying on time scales of 5 yrs or more. The variability the steep spectrum population is probably extrinsic in origin, being consistent with the predictions of refractive interstellar scintillation models.

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