Statistics of intraday variability in extragalactic radio sources

Details Statistics of intraday variability in extragalactic radio sources Statistics of intraday variability in extragalactic radio sources

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..279q&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 279-284.

Statistics

116

Extragalactic Radio Sources, Interstellar Matter, Quasars, Scintillation, Statistics, Very Long Base Interferometry, Light Curve, Polarization Characteristics, Radio Spectra, Variability

Scientific paper

Intraday variations with amplitudes ranging up to about 25 percent have been found in several compact extragalactic radio sources. Here we present the results of a search for such variations in two complete samples of flat-spectrum sources. Low-level fluctuations are found in virtually all sources that have a compact VLBI structure; this result is compatible with the expectation that the influence of refractive interstellar scintillation should be detectable on the 1-2 percent level. Larger variations are observed in about 25 percent of the flat-spectrum objects. The statistical data on these sources do not rule out interstellar scintillation as a possible origin of the variability; they are also compatible with an intrinsic explanation as suggested by more detailed investigations of individual sources.

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