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Survey and Analysis of 1-22 GHz Spectra for the Full Sample of 660 AGNs North of Declination −30°

Published online by Cambridge University Press:  12 April 2016

Y. Y. Kovalev ,
N. A. Nizhelsky ,
Yu. A. Kovalev ,
G. V. Zhekanis  and
A. V. Bogdantsov
Y. Y. Kovalev
Affiliation:
Astro Space Center of the Lebedev Physical Institute RAS, Profsoyuznaya 84/32, 117997 Moscow, Russia
N. A. Nizhelsky
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167Russia
Yu. A. Kovalev
Affiliation:
Astro Space Center of the Lebedev Physical Institute RAS, Profsoyuznaya 84/32, 117997 Moscow, Russia
G. V. Zhekanis
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167Russia
A. V. Bogdantsov
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167Russia

Abstract

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Measurements of broad-band 6-frequency 1-22 GHz spectra of 660 compact extragalactic radio sources were performed in 1997 (for declinations −30° < δ < + 43°) and 1998 (north of+49°) at RATAN-600. “Average rest-frame” statistical spectral shapes for different subsamples of sources are analyzed. These 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 sub-sample; this favors the models suggesting a relation between the emission mechanisms in radio and gamma-ray ranges. Sources are sampled for which the most compact VLBI structure is expected.

Type
Part 4. Radio Surveys for AGN
Information
International Astronomical Union Colloquium , Volume 184: AGN Surveys , 2002 , pp. 299 - 300
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Kovalev, Y.Y., Nizhelsky, N.A., Kovalev, Yu.A., et al. 1999, A&AS, 139, 545 Google Scholar
Preston, R.A., Morabito, D.D., Williams, J.G., et al. 1985, AJ, 90, 1599 CrossRefGoogle Scholar