On the Intrinsic Jet Properties of Fermi-detected Blazars

T. Savolainen, D. C. Homan, T. Hovatta, M. Kadler, Y. Y. Kovalev, M. L. Lister, E. Ros, J. A. Zensus

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


We report on an analysis of intrinsic jet properties between sources detected by the Fermi Gamma-ray Space Telescope during its first three months of science operations and those not detected in a sample 62 blazars. By combining high-resolution VLBI images and millimetre-wavelength flux density monitoring data, we have estimated their jet Doppler factors, Lorentz factors, and viewing angles in the observer’s frame and in the frame comoving with the jet. The analysis shows that, in addition to having on average higher variability Doppler factors, the blazars detected by the Fermi have a distribution of comoving frame viewing angles that is significantly narrower than that of the γ-ray weak blazars and centred roughly perpendicular to the jet axis. The lack of γ-ray bright blazars at small comoving frame viewing angles hints that their γ-ray emission may be intrinsically anisotropic or depend on the Lorentz factor.
Original languageEnglish
Title of host publicationAccretion and Ejection in AGN: a Global View
Subtitle of host publicationProceedings of a workshop held June 22-26, 2009 in Como, Italy
EditorsLaura Maraschi, Gabriele Ghisellini, Roberto Della Ceca, Fabrizio Tavecchio
ISBN (Electronic)978-1-58381-735-3
Publication statusPublished - 2010
MoE publication typeB3 Non-refereed article in conference proceedings
EventConference on Accretion and Ejection in AGN: A Global View - Como, Italy
Duration: 22 Jun 200926 Jun 2009

Publication series

NameAstronomical society of the pacific Conference Series
PublisherAstronomical Society of the Pacific
ISSN (Print)1050-3390


ConferenceConference on Accretion and Ejection in AGN: A Global View


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