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| 題名: | THE 2009 DECEMBER GAMMA-RAY FLARE OF 3C 454.3: THE MULTIFREQUENCY CAMPAIGN |
| 作者: | Pacciani,L;Vittorini,V;Tavani,M;Fiocchi,MT;Vercellone,S;Ammando,F;Sakamoto,T;Pian,E;Raiteri,CM;Villata,M;Sasada,M;Itoh,R;Yamanaka,M;Uemura,M;Striani,E;Fugazza,D;Tiengo,A;Krimm,HA;Stroh,MC;Falcone,AD;Curran,PA;Sadun,AC;Lahteenmaki,A;Tornikoski,M;Aller,HD;Aller,MF;Lin,CS;Larionov,VM;Leto,P;Takalo,LO;Berdyugin,A;Gurwell,MA;Bulgarelli,A;Chen,AW;Donnarumma,I;Giuliani,A;Longo,F;Pucella,G;Argan,A;Barbiellini,G;Caraveo,P;Cattaneo,PW;Costa,E;De Paris,G;Del Monte,E;Di Cocco,G;Evangelista,Y;Ferrari,A;Feroci,M;Fiorini,M;Fuschino,F;Galli,M;Gianotti,F;Labanti,C;Lapshov,I;Lazzarotto,F;Lipari,P;Marisaldi,M;Mereghetti,S;Morelli,E;Moretti,E;Morselli,A;Pellizzoni,A;Perotti,F;Piano,G;Picozza,P;Pilia,M;Prest,M;Rapisarda,M;Rappoldi,A;Rubini,A;Sabatini,S;Soffitta,P;Trifoglio,M;Trois,A;Vallazza,E;Zanello,D;Colafrancesco,S;Pittori,C;Verrecchia,F;Santolamazza,P;Lucarelli,F;Giommi,P;Salotti,L |
| 貢獻者: | 天文研究所 |
| 關鍵詞: | MULTIWAVELENGTH OBSERVATIONS;TIMING EXPLORER;CRAZY-DIAMOND;BLAZAR MODEL;WEBT;TELESCOPE;OUTBURST;CALIBRATION;3C-454.3;RADIO |
| 日期: | 2010 |
| 上傳時間: | 2012-03-27 18:10:11 (UTC+8) |
| 出版者: | 國立中央大學 |
| 摘要: | During the month of 2009 December, the blazar 3C 454.3 became the brightest gamma-ray source in the sky, reaching a peak flux F similar to 2000 x 10(-8) photons cm(-2) s(-1) for E > 100 MeV. Starting in 2009 November intensive multifrequency campaigns monitored the 3C 454 gamma-ray outburst. Here, we report on the results of a two-month campaign involving AGILE, INTEGRAL, Swift/XRT, Swift/BAT, and Rossi XTE for the high-energy observations and Swift/UVOT, KANATA, Goddard Robotic Telescope, and REM for the near-IR/optical/UV data. GASP/WEBT provided radio and additional optical data. We detected a long-term active emission phase lasting similar to 1 month at all wavelengths: in the gamma-ray band, peak emission was reached on 2009 December 2-3. Remarkably, this gamma-ray super-flare was not accompanied by correspondingly intense emission in the optical/UV band that reached a level substantially lower than the previous observations in 2007-2008. The lack of strong simultaneous optical brightening during the super-flare and the determination of the broadband spectral evolution severely constrain the theoretical modeling. We find that the pre- and post-flare broadband behavior can be explained by a one-zone model involving synchrotron self-Compton plus external Compton emission from an accretion disk and a broad-line region. However, the spectra of the 2009 December 2-3 super-flare and of the secondary peak emission on 2009 December 9 cannot be satisfactorily modeled by a simple one-zone model. An additional particle component is most likely active during these states. |
| 關聯: | ASTROPHYSICAL JOURNAL LETTERS |
| 顯示於類別: | [天文研究所] 期刊論文
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