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26 April 2024

» arxiv » 0802.1709

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AGILE detection of a strong gamma-ray flare from the blazar 3C 454.3
S. Vercellone ; A.W. Chen ; A. Giuliani ; A. Bulgarelli ; I. Donnarumma ; I. Lapshov ; M. Tavani ; A. Argan ; G. Barbiellini ; P. Caraveo ; V. Cocco ; E. Costa ; F. D'Ammando ; E. Del Monte ; G. De Paris ; G. Di Cocco ; Y. Evangelista ; M. Feroci ; M. Fiorini ; T. Froysland ; F. Fuschino ; M. Galli ; F. Gianotti ; C. Labanti ; F. Lazzarotto ; P. Lipari ; F. Longo ; M. Marisaldi ; F. Mauri ; S. Mereghetti ; A. Morselli ; L. Pacciani ; A. Pellizzoni ; F. Perotti ; P. Picozza ; M. Prest ; G. Pucella ; M. Rapisarda ; P. Soffitta ; M. Trifoglio ; A. Trois ; E. Vallazza ; V. Vittorini ; A. Zambra ; D. Zanello ; C. Pittori ; F. Verrecchia ;
Date:	12 Feb 2008
Abstract:	We report the first blazar detection by the AGILE satellite. AGILE detected 3C 454.3 during a period of strongly enhanced optical emission in July 2007. AGILE observed the source with a dedicated repointing during the period 2007 July 24-30 with its two co-aligned imagers, the Gamma-Ray Imaging Detector and the hard X-ray imager Super-AGILE sensitive in the 30 MeV-50 GeV and 18-60 keV, respectively. Over the entire period, AGILE detected gamma-ray emission from 3C 454.3 at a significance level of 13.8-$sigma$ with an average flux (E$>$100 MeV) of $(280 pm 40) imes 10^{-8}$ photons cm$^{-2}$ s$^{-1}$. The gamma-ray flux appears to be variable towards the end of the observation. No emission was detected by Super-AGILE in the energy range 20-60 keV, with a 3-$sigma$ upper limit of $2.3 imes 10^{-3}$ photons cm$^{-2}$ s$^{-1}$. The gamma-ray flux level of 3C 454.3 detected by AGILE is the highest ever detected for this quasar and among the most intense gamma-ray fluxes ever detected from Flat Spectrum Radio Quasars.
Source:	arXiv, 0802.1709
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