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. Coceo, E. Costa, F. D'Ammando, E. Del Monte, G. De Paris, G. Di Coceo, Y. Evangelista, M. Feroci, M. Fiorini, T. FroyslandF. 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, D. Gasparrini, S. Cutini, P. Giommi, L.A. Antonelli, S. Colafrancesco, L. Salotti

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Abstract

We report the first blazar detection by AGILE. AGILE detected 3C 454.3 during a period of strongly enhanced optical emission in 2007 July. 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 SuperAGILE sensitive in the 30 MeV to 50 GeV and 18-60 keV ranges, respectively. Over the entire period, AGILE detected γ-ray emission from 3C 454.3 at a significance level of 13.8 σ with an average flux (E> 100 MeV) of (280 ± 40) x 10-8photons cm-2s-1. The γ-ray flux appears to be variable toward the end of the observation. No emission was detected by Super-AGILE in the energy range 20-60 keV, with a 3 σ upper limit of 2.3 x 10-3photons cm-2s-1. The γ-ray flux level of 3C 454.3 detected by AGILE is the highest ever detected for this quasar and among the most intense γ-ray fluxes ever detected from flat-spectrum radio quasars. © 2008. The American Astronomical Society. All rights reserved Subject heading: gamma rays: observations-quasars: individual (3C 454.3).
Original languageEnglish
Pages (from-to)-
JournalAstrophysical Journal
Volume676
Issue number1 PART 2
DOIs
Publication statusPublished - 2008
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Vercellone, S., Chen, A. W., Giuliani, A., Bulgarelli, A., Donnarumma, I., Lapshov, I., ... Salotti, L. (2008). AGILE detection of a strong gamma-ray flare from the blazar 3C 454.3. Astrophysical Journal, 676(1 PART 2), -. https://doi.org/10.1086/587170