Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...733l..26a&link_type=abstract
The Astrophysical Journal Letters, Volume 733, Issue 2, article id. L26 (2011).
Astronomy and Astrophysics
Astronomy
17
Galaxies: Active
Scientific paper
The flat-spectrum radio quasar 3C454.3 underwent an extraordinary 5 day γ-ray outburst in 2010 November when the daily flux measured with the Fermi Large Area Telescope (LAT) at photon energies E > 100 MeV reached (66 ± 2) × 10-6 photons cm-2 s-1. This is a factor of three higher than its previous maximum flux recorded in 2009 December and >~ 5 times brighter than the Vela pulsar, which is normally the brightest source in the γ-ray sky. The 3 hr peak flux was (85 ± 5)×10-6 photons cm-2 s-1, corresponding to an apparent isotropic luminosity of (2.1 ± 0.2)×1050 erg s-1, the highest ever recorded for a blazar. In this Letter, we investigate the features of this exceptional event in the γ-ray band of the Fermi-LAT. In contrast to previous flares of the same source observed with the Fermi-LAT, clear spectral changes are observed during the flare.
Abdo Aws Ahmad
Ackermann Marcelo
Ajello Marco
Allafort Alice
Baldini Luca
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