Early Detections Of Flaring Blazars With The Fermi Gamma-ray Space Telescope

Details Early Detections Of Flaring Blazars With The Fermi Gamma-ray Space Telescope Early Detections Of Flaring Blazars With The Fermi Gamma-ray Space Telescope

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335501m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #355.01; Bulletin of the American Astronomical Society, Vol. 41, p.496

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the first Fermi Gamma-ray Space Telescope (formerly GLAST) detections of strong gamma-ray flares in two jet-dominated active galaxies (blazars). Large Area Telescope data reveal that 3C454.3, currently (since 2000) in the high, active state, flared with the rise time of about 3 days, corresponding to the highest E > 100 MeV flux detected in any blazar so far. PKS 1502+106 is a new, high redshift (z = 1.8) gamma-ray emitting blazar that flared by at least factor of 2 in less than 1 day: both observations put lower limits on the required Doppler factors of their relativistic jets. In 3C454.3, the LAT data alone indicate an unambiguous departure of the spectrum from a simple power law with the spectrum steepening to higher energies, allowing us to put some constraints on the location of the energy dissipation region in the jet.

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