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

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

2010-06-15

arxiv.org/abs/1006.3084v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 2 figures, 2 tables. Proceedings of the Workshop "Fermi meets Jansky - AGN in Radio and Gamma-Rays", Savolainen, T.,

Scientific paper

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.

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