Constraints on the gamma-ray emitting region in blazars from multi-frequency VLBI measurements

K. V. Sokolovsky, Y. Y. Kovalev, A. P. Lobanov, J. D. Finke, T. Savolainen, A. B. Pushkarev, M. Kadler, F. K. Schinzel, V. H. Chavushyan, L. Carrasco, A. Carraminana, M. A. Gurwell

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Single-zone synchrotron self-Compton and external Compton models are widely used to explain broad-band Spectral Energy Distributions (SEDs) of blazars from infrared to gamma-rays. These models bear obvious similarities to the homogeneous synchrotron cloud model which is often applied to explain radio emission from individual components of parsec-scale radio jets. The parsec-scale core, typically the brightest and most compact feature of blazar radio jet, could be the source of high-energy emission. We report on ongoing work to test this hypothesis by deriving the physical properties of parsec-scale radio emitting regions of twenty bright Fermi blazars using dedicated 5-43 GHz VLBA observations and comparing these parameters to results of SED modeling.
Original languageEnglish
Title of host publicationProceedings of the Workshop "Fermi meets Jansky - AGN in Radio and Gamma-Rays", Savolainen, T., Ros, E., Porcas, R.W. & Zensus, J.A. (eds.)
Number of pages4
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication


  • Astrophysics - High Energy Astrophysical Phenomena
  • Astrophysics - Cosmology and Extragalactic Astrophysics
  • Astrophysics - Galaxy Astrophysics


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