The low frequency variability of extragalactic radio sources - Discussion of the properties

Details The low frequency variability of extragalactic radio sources - Discussion of the properties The low frequency variability of extragalactic radio sources - Discussion of the properties

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118..171f&link_type=abstract

Astronomy and Astrophysics, vol. 118, no. 1, Feb. 1983, p. 171-179.

Astronomy and Astrophysics

Astronomy

37

Extragalactic Radio Sources, Quasars, Brightness Temperature, Compton Effect, Flux Density, Light Curve, Radio Astronomy, Variability

Scientific paper

Using homogeneous samples of extragalactic radio sources obtained by a five-year monitoring program of the Bologna Radiotelescope conducted at 408 MHz, the occurrence of low frequency variability (LFV) is statistically examined. The general behavior of the variability is discussed, and the frequency of occurrence of LFV in samples of sources with flat and steep spectra is considered. Flux density variability at different frequencies is compared, and the time scales of variability and are addressed. LFV is very common in samples of flat spectrum sources. Variation amplitudes decrease with increasing wavelength, but the decrease is much lower than one would expect if variability were due, at all frequencies, to expansion of a cloud of relativistic electrons. Typical time intervals range from a few months to a few years. The derived time scales of variability have a mean value of about 2-3 years, and the derived brightness temperatures are in the range 10 to the 14th up to 10 to the 15th K.

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