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Title:
Variability at frequencies of 3.9 and 7.5 GHz of radio sources from the Zelenchuk survey with fluxes greater than 200 mJy
Authors:
Gorshkov, A. G.; Konnikova, V. K.
Affiliation:
AA(Gosudarstvennyj Astronomicheskij Inst.), AB(Gosudarstvennyj Astronomicheskij Inst.)
Publication:
Astronomicheskij Zhurnal, vol. 72, p. 291
Publication Date:
06/1995
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
RADIO SOURCES (ASTRONOMY), PARTICLE FLUX DENSITY, VISIBLE SPECTRUM, STATISTICAL ANALYSIS, STELLAR MAGNITUDE, VARIABILITY, RED SHIFT, LUMINOSITY
Bibliographic Code:
1995AZh....72..291G

Abstract

Studies of the statistics of variability for a complete sample of radio sources from the Zelenchuk survey have been conducted. 180 radio sources with fluxes S3.9 greater than 200 mJy in the declination range of 4-6 deg were observed over the course of seven years. Among the sample sources, 46 percent were identified with optical objects to 21 m and 51 percent are located in empty fields in the Palomar Survey maps. 30 percent of the sample sources have variable fluxes with relative amplitudes V = Delta S/(S) greater than 0.12. The variability of objects having different types of optical identification is considered. The ratio of relative variability amplitudes at 3.9 and 7.5 GHz is 1.2 +/- 0.1. There is no statistically significant dependence of the relative variability amplitude on flux or visible stellar magnitude. We find that the degree of variability decreases with an increase in absolute radio luminosity and red shift. Such a dependence may be caused either by cosmological 'time dilation' or by an actual decrease in the relative variation with an increase in absolute luminosity. Observations over a longer period will permit discrimination between these alternatives.

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