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The 2009 Fermi Symposium

The First-Year Multi-Band Observations from Radio to Gamma-Ray of 3C 279 in the Fermi Era

Masaaki Hayashida, KIPAC/SLAC


Flat Spectrum Radio Quasar 3C279 (z=0.536), the first gamma-ray blazars discovered by EGRET, was one of the brightest gamma-ray sources in the sky at the time of discovery. Thanks to the much higher sensitivity and wider field of view than ones of EGRET, Fermi Space Gamma-ray Telescope has revealed the source activity in the gamma-ray band in a daily scale. We have organized extensive multiwavelength observations of 3C 279 from radio to gamma ray including intensive satellite observations (such as Suzaku and Spitzer) and optical polarimetric monitoring observations. In this presentation, we present the 1st year results of the multi-band behaviors of the source. Flux variability can be seen in all observed energy bands; in particular, the gamma-ray band shows the most violent variations with a change by an order of magnitude in flux during the 1-year observation. Based on correlations of the flux variations between the gamma-ray band and other bands, we will discuss! structures of relativistic jets.