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Paper: Survey and Analysis of 1-22 GHz Spectra for the Full Sample of 660 AGNs North of Declination -30 Degrees
Volume: 284, AGN Surveys, IAU Colloquium 184
Page: 299
Authors: Kovalev, Yuri Y.; Nizhelsky, N. A.; Kovalev, Yuri A.; Zhekanis, G. V.; Bogdantsov, A. V.
Abstract: About 700 sources were selected from the Preston et al. (1985) VLBI survey. Measurements of broad-band 6-frequency 1-22 GHz spectra for these objects were performed in 1997, 1998, and 2001 for different declination ranges at the northern, southern, and southern+flat sectors of RATAN-600, respectively. The "average rest-frame" statistical spectral shapes for several subsamples of sources are analyzed. The shapes and each spectrum observed can be represented as the sum of a spectrum of an extended optically thin component (magnetized envelope/lobe), constant or slowly variable and dominating at lower frequencies, and a spectrum of a compact component (relativistic jet), dominating at higher frequencies, with any type of variability. We have revealed specific radio features of the EGRET subsample; this favors the models suggesting a relation between the emission mechanisms in radio and gamma ranges. Sources are sampled, for which the most compact VLBI structure is expected.
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