Strong Long-Term Variability of RATAN-600 1-22 GHz Instantaneous Radio Spectra of 200 AGNs in 1997-2003

Details Strong Long-Term Variability of RATAN-600 1-22 GHz Instantaneous Radio Spectra of 200 AGNs in 1997-2003 Strong Long-Term Variability of RATAN-600 1-22 GHz Instantaneous Radio Spectra of 200 AGNs in 1997-2003

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..360..137k&link_type=abstract

AGN Variability from X-Rays to Radio Waves ASP Conference Series, Vol. 360, Proceedings of the conference held 14-16 June, 2004

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

The RATAN-600 radio telescope has been used for monitoring broad-band spectra at 5-6 wavelengths of 1.4, 2.7, 3.9, 7.7, 13, and 31 cm. About 20 spectral measurements for each of 200 sources have been made during the last 7 years. Measurements at all frequencies are made simultaneously in a time period of several minutes. The sources studied show strong variability with flux density changes of more than 50 % with characteristic time scales of more than 1 month. The objects were selected from a sample of 600 objects included in the monitoring. Observed spectra are simulated by a sum of two components: the synchrotron radio emission of a continuous relativistic jet from an active core (black hole with accretion disk) in the longitudinal magnetic field applying the ``hedgehog'' model of AGNs, and the optically-thin emission of an extended envelope. The long-term and short-term variability of the spectra is simulated by variability of the jet emission caused by a variable continuous flow of relativistic particles injected from the core to the jet. The model analysis yields that the nature of the radio emission and the observed behavior of variable 1-22 GHz radio spectra of various types of AGNs can be explained by the proposed relativistic jet model.

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