Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf...77k&link_type=abstract
6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Onsets of strong radio flares in several dozens of AGN were detected, and their evolution was studied using 1--22 GHz 6-frequency instantaneous spectra monitoring of compact extragalactic objects in 1997--2002 with RATAN--600. We observed six of these sources with the European VLBI Network (including HartRAO) at 5 GHz twice in 1999, February and September. The resolution of about 1--3 mas was achieved. Results of this VLBI project are reported and discussed. It is inferred that more than 80% of the total emission of these sources is coming from the mas scale. A typical behaviour of spectra evolution during strong radio outbursts in various objects is recognised suggesting a common physical nature of the variability. The flares started at the highest frequency and were moving to the lower frequency in a regular fashion. The behaviour of the flares is explained by a synchrotron emission of an evolving blob in a compact relativistic jet of an active galactic nucleus. Different physical models are discussed considering the single dish and the VLBI data.
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