Variability of extragalactic sources at 2.7 GHz. III - The nature of the variations in different source classes

Details Variability of extragalactic sources at 2.7 GHz. III - The nature of the variations in different source classes Variability of extragalactic sources at 2.7 GHz. III - The nature of the variations in different source classes

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..541k&link_type=abstract

Astronomical Journal, vol. 82, Aug. 1977, p. 541-556. Research supported by the National Research Council of Canada.

Astronomy and Astrophysics

Astronomy

32

Microwave Frequencies, Radiant Flux Density, Radio Astronomy, Radio Sources (Astronomy), Variability, Quasars, Radio Spectra, Tables (Data)

Scientific paper

The incidence of variability at 2.7 GHz and other frequencies in 365 extragalactic sources over periods of up to 10 years is examined as a function of source spectrum, optical identification, and survey frequency. Source spectra in the range from 1 to 10 GHz are classified according to the location of each source in a radio 'two-color' diagram, the variability of each source is assessed in terms of the x-squared statistic and two indices, and possible selection effects in the variability assessment are considered. It is found that: (1) most sources in spectral classes Q1, Q2, and Q3 are variable at 2.7 GHz; (2) about 25% of the observed class G sources vary at this frequency; (3) the incidence of variability depends more on spectral class than on survey frequency; and (4) the nature of the optical identification appears to be secondary to spectral classification in determining whether a source is seen to vary. Variability amplitudes at different frequencies are compared, and it is concluded that highly variable Q-type source components deviate systematically from the standard expanding-cloud model.

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