Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aspc..299..259s&link_type=abstract
High Energy Blazar Astronomy, ASP Conference Proceedings, Vol. 299, held 17-21 June 2002 at Tuorla Observatory, Piikkio, Finland
Astronomy and Astrophysics
Astronomy
Scientific paper
We compare total flux density (TFD) variations in 27 γ-bright blazars with structural changes in their parsec-scale jets using multi-epoch VLBA observations at 22 and 43 GHz together with data from the Metsähovi quasar monitoring program. There is a clear connection between TFD outbursts and VLBI components emerging into the jet. The ejections of the VLBI components are coincident with the beginning times of the TFD flares, and they also show similar flux evolution. Our results suggest that all radio variations are related to shocks propagating in the jet. In our sources, a large fraction of the shocks seem to grow and decay within the innermost few tenths of a milliarcsecond of the radio core. Therefore, we see them only as so-called ``core flares'' in the VLBI images.
Jorstad S.> G.
Marscher Alan P.
Savolainen Tuomas
Valtaoja Esko
Wiik Kaj
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