Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sao.ru/cats/~satr/RFSymp/abs/21_Kovalev.pdf Дата изменения: Mon Oct 9 11:39:02 2006 Дата индексирования: Tue Oct 2 09:33:42 2012 Кодировка: Поисковые слова: http astrokuban.info astrokuban

NATURE OF ACTIVE GALACTIC NUCLEI FROM MASSIVE INSTANTANEOUS RADIO SPECTRA STUDY WITH RATAN­600 IN 1997­2006 SUPPLEMENTED BY VLBA EXPERIMENTS
Yu.A. Kovalev1 , Y.Y. Kovalev1,2 , G.V. Zhekanis3 , N.A. Nizhelsky
1 3

Astro Space Center of Leb edev Physical Institute, Profsoyuznya 84/32, 117997 Moscow, Russia 2 Max-Planck Institute fur Radioastronomie, Ё Auf dem Hugel 69, 53121 Bonn, Germany Ё 3 Sp ecial Astrophysical Observatory of RAS, Nizhnij Arkhyz, 369167 Russia ykovalev@avunda.asc.rssi.ru

We present results of observations of 1­22 GHz instantaneous continuum sp ectra of ab out 3000 active galactic nuclei p erformed in 1997­2006 with the 600 meter ring transit radio telescop e RATAN­600. An analysis of typ es and structure of the measured instantaneous sp ectra has lead us to a conclusion that almost all sp ectra could b e mo deled as a sum of two main sp ectral comp onents: LF-comp onent (decreasing with frequency) and HF-comp onent (with a maximum in cm-mm band). In the framework of a mo del with longitudinal magnetic field, the HF-comp onent is explained by synchrotron radiation of a continuous compact relativistic jet emerging from the nucleus, the LF-comp onent -- by radiation of optically thin extended p eripheral structures which accumulate jet particles. Long term variability is studied in ab out 600 AGNs. It is dominated in the same mo del by the variable emission of a compact jet (HF-comp onent) and is explained by variable flow of relativistic particles injected in the jet base. We also apply another mo del, a standard homogeneous blob of relativistic particles with synchrotron self-absorption, for sources with simple parsec scale structure and p eaked sp ectral shap e. On the basis of our combined RATAN and VLBA measurements, we estimate the magnetic field in jet regions of these sources and compare it with estimations provided by the mo del with longitudinal magnetic field.