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Title:
Multiwavelength Observations of 3C 454.3. II. The AGILE 2007 December Campaign
Authors:
Donnarumma, I.; Pucella, G.; Vittorini, V.; D'Ammando, F.; Vercellone, S.; Raiteri, C. M.; Villata, M.; Perri, M.; Chen, W. P.; Smart, R. L.; Kataoka, J.; Kawai, N.; Mori, Y.; Tosti, G.; Impiombato, D.; Takahashi, T.; Sato, R.; Tavani, M.; Bulgarelli, A.; Chen, A. W.; Giuliani, A.; Longo, F.; Pacciani, L.; Argan, A.; Barbiellini, G.; Boffelli, F.; Caraveo, P.; Cattaneo, P. W.; Cocco, V.; Contessi, T.; Costa, E.; Del Monte, E.; De Paris, G.; Di Cocco, G.; Evangelista, Y.; Feroci, M.; Ferrari, A.; Fiorini, M.; Froysland, T.; Frutti, M.; Fuschino, F.; Galli, M.; Gianotti, F.; Labanti, C.; Lapshov, I.; Lazzarotto, F.; Lipari, P.; Marisaldi, M.; Mastropietro, M.; Mereghetti, S.; Morelli, E.; Moretti, E.; Morselli, A.; Pellizzoni, A.; Perotti, F.; Piano, G.; Picozza, P.; Pilia, M.; Porrovecchio, G.; Prest, M.; Rapisarda, M.; Rappoldi, A.; Rubini, A.; Sabatini, S.; Scalise, E.; Soffitta, P.; Striani, E.; Trifoglio, M.; Trois, A.; Vallazza, E.; Zambra, A.; Zanello, D.; Pittori, C.; Santolamazza, P.; Verrecchia, F.; Giommi, P.; Antonelli, L. A.; Colafrancesco, S.; Salotti, L.
Affiliation:
AA(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ; AGILE Team corresponding author; ), AB(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), AC(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), AD(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ; Dip. di Fisica, Univ. "Tor Vergata," Via della Ricerca Scientifica 1, I-00133 Rome, Italy ), AE(INAF/IASF Palermo Via Ugo La Malfa 153, 90146 Palermo, Italy ), AF(INAF/OATo, Via Osservatorio 20, I-10025 Pino Torinese, Italy ), AG(INAF/OATo, Via Osservatorio 20, I-10025 Pino Torinese, Italy ), AH(ASI-ASDC, Via G. Galilei, I-00044 Frascati (Rome), Italy ), AI(Institute of Astronomy, National Central University, Taiwan ), AJ(INAF/OATo, Via Osservatorio 20, I-10025 Pino Torinese, Italy ), AK(Department of Physics, Tokyo Institute of Technology, Tokyo, Japan ), AL(Department of Physics, Tokyo Institute of Technology, Tokyo, Japan ), AM(Department of Physics, Tokyo Institute of Technology, Tokyo, Japan ), AN(Dip. di Fisica, Univ. di Perugia, Via Pascoli, I-06123 Perugia, Italy ), AO(Dip. di Fisica, Univ. di Perugia, Via Pascoli, I-06123 Perugia, Italy ), AP(ISAS/JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan ), AQ(ISAS/JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan ), AR(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ; Dip. di Fisica, Univ. "Tor Vergata," Via della Ricerca Scientifica 1, I-00133 Rome, Italy ), AS(INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy ), AT( INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milan, Italy ), AU( INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milan, Italy ), AV( Dip. di Fisica and INFN Trieste, Via Valerio 2, I-34127 Trieste, Italy ), AW(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), AX(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), AY( Dip. di Fisica and INFN Trieste, Via Valerio 2, I-34127 Trieste, Italy ), AZ(INFN-Pavia, Via Bassi 6, I-27100 Pavia, Italy ), BA( INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milan, Italy ), BB(INFN-Pavia, Via Bassi 6, I-27100 Pavia, Italy ), BC(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), BD( INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milan, Italy ), BE(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), BF(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), BG(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), BH(INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy ), BI(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), BJ(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), BK(CIFS-Torino, Viale Settimio Severo 63, I-10133 Turin, Italy ; Dip. di Fisica Generale dell'Universitá, Via Pietro Giuria 1, I-10125 Turin, Italy ), BL( INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milan, Italy ), BM(CIFS-Torino, Viale Settimio Severo 63, I-10133 Turin, Italy ), BN(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), BO(INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy ), BP(ENEA, Via Martiri di Monte Sole 4, I-40129 Bologna, Italy ), BQ(INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy ), BR(INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy ), BS(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), BT(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), BU(INFN-Rome "La Sapienza," Piazzale A. Moro 2, I-00185 Rome, Italy ), BV(INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy ), BW(Consiglio Nazionale delle Ricerche, Istituto Metodologie Inorganiche e dei Plasmi, Area Ricerca Montelibretti (Rome), Italy ), BX( INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milan, Italy ), BY(INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy ), BZ( Dip. di Fisica and INFN Trieste, Via Valerio 2, I-34127 Trieste, Italy ), CA(INFN-Rome "Tor Vergata," Via della Ricerca Scientifica 1, I-00133 Rome, Italy ), CB(INAF-Osservatorio Astronomico di Cagliari, localit Poggio dei Pini, Strada 54, I-09012 Capoterra, Italy ), CC( INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milan, Italy ), CD(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ; Dip. di Fisica, Univ. "Tor Vergata," Via della Ricerca Scientifica 1, I-00133 Rome, Italy ), CE(INFN-Rome "Tor Vergata," Via della Ricerca Scientifica 1, I-00133 Rome, Italy ), CF(INAF-Osservatorio Astronomico di Cagliari, localit Poggio dei Pini, Strada 54, I-09012 Capoterra, Italy ; Dip. di Fisica, Univ. dell'Insubria, Via Valleggio 11, I-22100 Como, Italy ), CG(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), CH(Dip. di Fisica, Univ. dell'Insubria, Via Valleggio 11, I-22100 Como, Italy ), CI(ENEA-Rome, Via E. Fermi 45, I-00044 Frascati (Rome), Italy ), CJ(INFN-Pavia, Via Bassi 6, I-27100 Pavia, Italy ), CK(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), CL(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), CM(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), CN(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), CO(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ; Dip. di Fisica, Univ. "Tor Vergata," Via della Ricerca Scientifica 1, I-00133 Rome, Italy ), CP(INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy ), CQ(INAF/IASF-Rome, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy ), CR( Dip. di Fisica and INFN Trieste, Via Valerio 2, I-34127 Trieste, Italy ), CS( INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milan, Italy ), CT(INFN-Rome "La Sapienza," Piazzale A. Moro 2, I-00185 Rome, Italy ), CU(ASI-ASDC, Via G. Galilei, I-00044 Frascati (Rome), Italy ), CV(ASI-ASDC, Via G. Galilei, I-00044 Frascati (Rome), Italy ), CW(ASI-ASDC, Via G. Galilei, I-00044 Frascati (Rome), Italy ), CX(ASI-ASDC, Via G. Galilei, I-00044 Frascati (Rome), Italy ), CY(Osservarorio Astronomico di Rome, Monte Porzio Catone (Rome), Italy ), CZ(ASI-ASDC, Via G. Galilei, I-00044 Frascati (Rome), Italy ), DA(ASI, Viale Liegi 26, I-00198 Rome, Italy )
Publication:
The Astrophysical Journal, Volume 707, Issue 2, pp. 1115-1123 (2009). (ApJ Homepage)
Publication Date:
12/2009
Origin:
IOP
ApJ Keywords:
galaxies: active, galaxies: individual: 3C 454.3, galaxies: jets, gamma rays: observations, quasars: general, radiation mechanisms: non-thermal
DOI:
10.1088/0004-637X/707/2/1115
Bibliographic Code:
2009ApJ...707.1115D

Abstract

We report on the second Astrorivelatore Gamma a Immagini Leggero (AGILE) multiwavelength campaign of the blazar 3C 454.3 during the first half of 2007 December. This campaign involved AGILE, Spitzer, Swift, Suzaku, the Whole Earth Blazar Telescope (WEBT) consortium, the Rapid Eye Mount (REM), and the Multicolor Imaging Telescopes for Survey and Monstrous Explosions (MITSuME) telescopes, offering a broadband coverage that allowed for a simultaneous sampling of the synchrotron and inverse Compton (IC) emissions. The two-week AGILE monitoring was accompanied by radio to optical monitoring by WEBT and REM, and by sparse observations in mid-infrared and soft/hard X-ray energy bands performed by means of Target of Opportunity observations by Spitzer, Swift, and Suzaku, respectively. The source was detected with an average flux of ~250 × 10–8 photons cm–2 s–1 above 100 MeV, typical of its flaring states. The simultaneous optical and γ-ray monitoring allowed us to study the time lag associated with the variability in the two energy bands, resulting in a possible lsimone-day delay of the γ-ray emission with respect to the optical one. From the simultaneous optical and γ-ray fast flare detected on December 12, we can constrain the delay between the γ-ray and optical emissions within 12 hr. Moreover, we obtain three spectral energy distributions (SEDs) with simultaneous data for 2007 December 5, 13, and 15, characterized by the widest multifrequency coverage. We found that a model with an external Compton on seed photons by a standard disk and reprocessed by the broad-line regions does not describe in a satisfactory way the SEDs of 2007 December 5, 13, and 15. An additional contribution, possibly from the hot corona with T = 106 K surrounding the jet, is required to account simultaneously for the softness of the synchrotron and the hardness of the IC emissions during those epochs.
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