ON THE BREAK IN THE FERMI-LARGE AREA TELESCOPE SPECTRUM OF 3C 454.3

被引：82

作者：

Finke, Justin D. ^{[1
]}

Dermer, Charles D. ^{[1
]}

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 714卷 / 02期

关键词：

gamma rays: galaxies; quasars: individual (3C 454.3); radiation mechanisms: non-thermal; GAMMA-RAY ABSORPTION; MULTIWAVELENGTH OBSERVATIONS; RADIATION-FIELDS; CRAZY-DIAMOND; BLACK-HOLES; QUASARS; BLAZARS; MODEL; VARIABILITY; DISK;

D O I：

10.1088/2041-8205/714/2/L303

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Fermi Gamma-ray Space Telescope observations of the flat spectrum radio quasar 3C 454.3 show a spectral-index change Delta Gamma congruent to 1.2 +/- 0.3 at break energy E(br) approximate to 2.4 +/- 0.3 GeV. Such a sharp break is inconsistent with a cooling electron distribution and is poorly fit with a synchrotron self-Compton model. We show that a combination of two components, namely, the Compton-scattered disk and broad-line region (BLR) radiations, explains this spectral break and gives a good fit to the quasi-simultaneous radio, optical/UV, X-ray, and gamma-ray spectral energy distribution observed in 2008 August. A sharp break can be produced independent of the emitting region's distance from the central black hole if the BLR has a gradient in density proportional to R(-2), consistent with a wind model for the BLR.

引用

页码：L303 / L307

页数：5

共 27 条

[21] The redshift dependence of gamma-ray absorption in the environments of strong-line AGNs [J].

Reimer, A. .

ASTROPHYSICAL JOURNAL, 2007, 665 (02) :1023-1029

[22]

SHAKURA NI, 1973, ASTRON ASTROPHYS, V24, P337

[23] 3C 454.3 reveals the structure and physics of its "blazar zone" [J].

Sikora, Marek ;

Moderski, Rafax ;

Madejski, Greg M. .

ASTROPHYSICAL JOURNAL, 2008, 675 (01) :71-78

[24] Intergalactic photon spectra from the far-IR to the UV Lyman limit for 0<z<6 and the optical depth of the universe to high-energy gamma rays [J].

Stecker, F. W. ;

Malkan, M. A. ;

Scully, S. T. .

ASTROPHYSICAL JOURNAL, 2006, 648 (02) :774-783

[25]

TOSTI G, 2008, ASTRONOMERS TELEGRAM, V1628, P1

[26] MULTIWAVELENGTH OBSERVATIONS OF 3C 454.3. III. EIGHTEEN MONTHS OF AGILE MONITORING OF THE "CRAZY DIAMOND" [J].

Vercellone, S. ;

D'Ammando, F. ;

Vittorini, V. ;

Donnarumma, I. ;

Pucella, G. ;

Tavani, M. ;

Ferrari, A. ;

Raiteri, C. M. ;

Villata, M. ;

Romano, P. ;

Krimm, H. ;

Tiengo, A. ;

Chen, A. W. ;

Giovannini, G. ;

Venturi, T. ;

Giroletti, M. ;

Kovalev, Y. Y. ;

Sokolovsky, K. ;

Pushkarev, A. B. ;

Lister, M. L. ;

Argan, A. ;

Barbiellini, G. ;

Bulgarelli, A. ;

Caraveo, P. ;

Cattaneo, P. W. ;

Cocco, V. ;

Costa, E. ;

Del Monte, E. ;

De Paris, G. ;

Di Cocco, G. ;

Evangelista, Y. ;

Feroci, M. ;

Fiorini, M. ;

Fornari, F. ;

Froysland, T. ;

Fuschino, F. ;

Galli, M. ;

Gianotti, F. ;

Labanti, C. ;

Lapshov, I. ;

Lazzarotto, F. ;

Lipari, P. ;

Longo, F. ;

Giuliani, A. ;

Marisaldi, M. ;

Mereghetti, S. ;

Morselli, A. ;

Pellizzoni, A. ;

Pacciani, L. ;

Perotti, F. .

ASTROPHYSICAL JOURNAL, 2010, 712 (01) :405-420

[27] MULTIWAVELENGTH OBSERVATIONS OF 3C 454.3. I. THE AGILE 2007 NOVEMBER CAMPAIGN ON THE "CRAZY DIAMOND" [J].