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Title:
Early Fermi Gamma-ray Space Telescope Observations of the Quasar 3C 454.3
Authors:
Abdo, A. A.; Ackermann, M.; Ajello, M.; Atwood, W. B.; Axelsson, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Battelino, M.; Baughman, B. M.; Bechtol, K.; Bellazzini, R.; Berenji, B.; Blandford, R. D.; Bloom, E. D.; Bonamente, E.; Borgland, A. W.; Bouvier, A.; Bregeon, J.; Brez, A.; Brigida, M.; Bruel, P.; Burnett, T. H.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Casandjian, J. M.; Cavazzuti, E.; Cecchi, C.; Charles, E.; Chaty, S.; Chekhtman, A.; Cheung, C. C.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Cominsky, L. R.; Conrad, J.; Costamante, L.; Cutini, S.; Dermer, C. D.; de Angelis, A.; de Palma, F.; Digel, S. W.; Silva, E. do Couto e.; Donato, D.; Drell, P. S.; Dubois, R.; Dumora, D.; Farnier, C.; Favuzzi, C.; Focke, W. B.; Foschini, L.; Frailis, M.; Fuhrmann, L.; Fukazawa, Y.; Funk, S.; Fusco, P.; Gargano, F.; Gasparrini, D.; Gehrels, N.; Germani, S.; Giebels, B.; Giglietto, N.; Giommi, P.; Giordano, F.; Glanzman, T.; Godfrey, G.; Grenier, I. A.; Grondin, M.-H.; Grove, J. E.; Guillemot, L.; Guiriec, S.; Hanabata, Y.; Harding, A. K.; Hartman, R. C.; Hayashida, M.; Hays, E.; Hughes, R. E.; Jóhannesson, G.; Johnson, A. S.; Johnson, R. P.; Johnson, W. N.; Kamae, T.; Katagiri, H.; Kataoka, J.; Kawai, N.; Kerr, M.; Knödlseder, J.; Kocian, M. L.; Kuehn, F.; Kuss, M.; Latronico, L.; Lee, S.-H.; Lemoine-Goumard, M.; Longo, F.; Loparco, F.; Lott, B.; Lovellette, M. N.; Lubrano, P.; Madejski, G. M.; Makeev, A.; Massaro, E.; Mazziotta, M. N.; McEnery, J. E.; McGlynn, S.; Meurer, C.; Michelson, P. F.; Mitthumsiri, W.; Mizuno, T.; Moiseev, A. A.; Monte, C.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V.; Murgia, S.; Nolan, P. L.; Norris, J. P.; Nuss, E.; Ohsugi, T.; Omodei, N.; Orlando, E.; Ormes, J. F.; Paneque, D.; Panetta, J. H.; Parent, D.; Pelassa, V.; Pepe, M.; Pesce-Rollins, M.; Piron, F.; Porter, T. A.; Rainò, S.; Rando, R.; Razzano, M.; Reimer, A.; Reimer, O.; Reposeur, T.; Reyes, L. C.; Ritz, S.; Rochester, L. S.; Rodriguez, A. Y.; Rahoui, F.; Ryde, F.; Sadrozinski, H. F.-W.; Sambruna, R.; Sanchez, D.; Sander, A.; Parkinson, P. M. Saz; Sgrò, C.; Shaw, M. S.; Smith, D. A.; Smith, P. D.; Spandre, G.; Spinelli, P.; Starck, J.-L.; Strickman, M. S.; Suson, D. J.; Tajima, H.; Takahashi, H.; Takahashi, T.; Tanaka, T.; Thayer, J. B.; Thayer, J. G.; Thompson, D. J.; Tibaldo, L.; Torres, D. F.; Tosti, G.; Tramacere, A.; Uchiyama, Y.; Usher, T. L.; Vilchez, N.; Villata, M.; Vitale, V.; Waite, A. P.; Winer, B. L.; Wood, K. S.; Ylinen, T.; Zensus, J. A.; Ziegler, M.
Affiliation:
AA(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ; National Research Council Research Associate. ; ), AB(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), AC(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), AD(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA ), AE(The Oskar Klein Centre for Cosmo Particle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Astronomy, Stockholm University, SE-106 91 Stockholm, Sweden ), AF(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), AG(Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette, France ), AH(Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, Italy ; Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy ), AI(Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy ; Dipartimento di Fisica "G. Galilei," Università di Padova, I-35131 Padova, Italy ), AJ(The Oskar Klein Centre for Cosmo Particle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, Sweden ), AK(Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA ), AL(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), AM(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), AN(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), AO(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), AP(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), AQ(Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy ; Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy ), AR(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), AS(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), AT(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), AU(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), AV(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), AW(Laboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, France ), AX(Department of Physics, University of Washington, Seattle, WA 98195-1560, USA ), AY(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), AZ(W. W. 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Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), BF(Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette, France ), BG(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ; George Mason University, Fairfax, VA 22030, USA ), BH(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ), BI(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), BJ(Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy ; Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy ), BK(W. W. 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Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), DZ(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ; George Mason University, Fairfax, VA 22030, USA ), EA(Center for Research and Exploration in Space Science and Technology (CRESST), NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ), EB(Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), EC(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ), EE(The Oskar Klein Centre for Cosmo Particle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, Sweden ), EE(The Oskar Klein Centre for Cosmo Particle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden ), EF(W. 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Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), EL(Department of Physics and Astronomy, University of Denver, Denver, CO 80208, USA ), EM(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), EN(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), EO(W. W. 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Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), FE(Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy ; Dipartimento di Fisica "G. Galilei," Università di Padova, I-35131 Padova, Italy ), FF(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), FG(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), FH(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), FI(CNRS/IN2P3, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France ; Université de Bordeaux, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan 33175, France ), FJ(Institut de Ciencies de l'Espai (IEEC-CSIC), Campus UAB, 08193 Barcelona, Spain ), FK(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; University of Maryland, College Park, MD 20742, USA ), FL(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), FM(Department of Chemistry and Physics, Purdue University Calumet, Hammond, IN 46323-2094, USA ), FN(Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette, France ), FO(The Oskar Klein Centre for Cosmo Particle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, Sweden ), FP(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA ), FQ(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ), FR(Laboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, France ), FS(Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA ), FT(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA ), FU(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), FV(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), FW(CNRS/IN2P3, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France ; Université de Bordeaux, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan 33175, France ), FX(Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA ), FY(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), FZ(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), GA(Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette, France ), GB(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ), GC(Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan ), GD(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), GE(Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan ), GF(Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain ), GG(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), GH(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), GI(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), GJ(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ), GK(Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy ; Dipartimento di Fisica "G. Galilei," Università di Padova, I-35131 Padova, Italy ), GL(Consorzio Interuniversitario per la Fisica Spaziale (CIFS), I-10133 Torino, Italy ; Department of Chemistry and Physics, Purdue University Calumet, Hammond, IN 46323-2094, USA ), GM(Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy ; Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy ), GN(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ; INAF, Osservatorio Astronomico di Torino, Torino, Italy ), GO(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), GP(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), GQ(Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, BP 44346, F-30128 Toulouse Cedex 4, France ), GR(Dipartimento di Fisica, Università di Roma "Tor Vergata," I-00133 Roma, Italy ), GS(Department of Physics and Astronomy, University of Denver, Denver, CO 80208, USA ; School of Pure and Applied Natural Sciences, University of Kalmar, SE-391 82 Kalmar, Sweden ), GT(W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), GU(Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA ), GV(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ), GW(The Oskar Klein Centre for Cosmo Particle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, Sweden ; School of Pure and Applied Natural Sciences, University of Kalmar, SE-391 82 Kalmar, Sweden ), GX(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany ), GY(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA )
Publication:
The Astrophysical Journal, Volume 699, Issue 1, pp. 817-823 (2009). (ApJ Homepage)
Publication Date:
07/2009
Origin:
IOP
ApJ Keywords:
galaxies: active, gamma rays: observations, quasars: individual: 3C 454.3
DOI:
10.1088/0004-637X/699/1/817
Bibliographic Code:
2009ApJ...699..817A

Abstract

This is the first report of Fermi Gamma-Ray Space Telescope observations of the quasar 3C 454.3, which has been undergoing pronounced long-term outbursts since 2000. The data from the Large Area Telescope, covering 2008 July 7-October 6, indicate strong, highly variable γ-ray emission with an average flux of ~3 × 10-6 photons cm-2 s-1, for energies >100 MeV. The γ-ray flux is variable, with strong, distinct, symmetrically shaped flares for which the flux increases by a factor of several on a timescale of about 3 days. This variability indicates a compact emission region, and the requirement that the source is optically thin to pair production implies relativistic beaming with Doppler factor δ>8, consistent with the values inferred from Very Long Baseline Interferometry observations of superluminal expansion (δ ~ 25). The observed γ-ray spectrum is not consistent with a simple power law, but instead steepens strongly above ~2 GeV, and is well described by a broken power law with photon indices of ~2.3 and ~3.5 below and above the break, respectively. This is the first direct observation of a break in the spectrum of a high-luminosity blazar above 100 MeV, and it is likely direct evidence for an intrinsic break in the energy distribution of the radiating particles. Alternatively, the spectral softening above 2 GeV could be due to γ-ray absorption via photon-photon pair production on the soft X-ray photon field of the host active galactic nucleus, but such an interpretation would require the dissipation region to be located very close (lsim100 gravitational radii) to the black hole, which would be inconsistent with the X-ray spectrum of the source.
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