Connections between millimetre continuum flares and the parsec-scale jet structure in blazars

T. Savolainen, K. Wiik, E. Valtaoja, S. G. Jorstad, A. P. Marscher

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific

Abstract

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.
Original languageEnglish
Title of host publicationHigh Energy Blazar Astronomy, ASP Conference Series
Pages259
Volume299
Publication statusPublished - 2003
MoE publication typeB3 Non-refereed article in conference proceedings

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