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

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

Not published at Aalto University

University of Turku

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific

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 language	English
Title of host publication	High Energy Blazar Astronomy, ASP Conference Series
Pages	259
Volume	299
Publication status	Published - 2003
MoE publication type	B3 Non-refereed conference publication

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http://adsabs.harvard.edu/abs/2003ASPC..299..259S

Cite this

@inproceedings{631cec9884054fe7a1a3f4ba5f1d5439,

title = "Connections between millimetre continuum flares and the parsec-scale jet structure in blazars",

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 Mets{\"a}hovi 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.",

author = "T. Savolainen and K. Wiik and E. Valtaoja and Jorstad, {S. G.} and Marscher, {A. P.}",

year = "2003",

language = "English",

volume = "299",

pages = "259",

booktitle = "High Energy Blazar Astronomy, ASP Conference Series",

}

TY - GEN

T1 - Connections between millimetre continuum flares and the parsec-scale jet structure in blazars

AU - Savolainen, T.

AU - Wiik, K.

AU - Valtaoja, E.

AU - Jorstad, S. G.

AU - Marscher, A. P.

PY - 2003

Y1 - 2003

N2 - 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.

AB - 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.

M3 - Conference article in proceedings

VL - 299

SP - 259

BT - High Energy Blazar Astronomy, ASP Conference Series

ER -

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

Abstract

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