FERMI-LARGE AREA TELESCOPE OBSERVATIONS OF THE EXCEPTIONAL GAMMA-RAY OUTBURSTS OF 3C 273 IN 2009 SEPTEMBER

被引：49

作者：

Abdo, A. A. ^{[1
,2
]}

Ackermann, M. ^{[3
,4
]}

Ajello, M. ^{[3
,4
]}

Baldini, L. ^{[5
]}

Ballet, J. ^{[6
]}

Barbiellini, G. ^{[7
,8
]}

Bastieri, D. ^{[9
,10
]}

Bechtol, K. ^{[3
,4
]}

Bellazzini, R. ^{[5
]}

Berenji, B. ^{[3
,4
]}

Blandford, R. D. ^{[3
,4
]}

Bloom, E. D. ^{[3
,4
]}

Bonamente, E. ^{[11
,12
]}

Borgland, A. W. ^{[3
,4
]}

Bouvier, A. ^{[3
,4
]}

Bregeon, J. ^{[5
]}

Brez, A. ^{[5
]}

Brigida, M. ^{[13
,14
]}

Bruel, P. ^{[15
]}

Burnett, T. H. ^{[16
]}

Buson, S. ^{[9
]}

Caliandro, G. A. ^{[17
]}

Cameron, R. A. ^{[3
,4
]}

Cannon, A. ^{[18
,19
]}

Caraveo, P. A. ^{[20
]}

Carrigan, S. ^{[10
]}

Casandjian, J. M. ^{[6
]}

Cavazzuti, E. ^{[21
]}

Cecchi, C. ^{[11
,12
]}

Celik, Oe. ^{[18
,22
,23
,24
]}

Charles, E. ^{[3
,4
]}

Chekhtman, A. ^{[1
,25
]}

Cheung, C. C. ^{[1
,2
]}

Chiang, J. ^{[3
,4
]}

Ciprini, S. ^{[12
]}

Claus, R. ^{[3
,4
]}

Cohen-Tanugi, J. ^{[26
]}

Conrad, J. ^{[27
,28
]}

Costamante, L. ^{[3
,4
]}

Dermer, C. D. ^{[1
]}

de Angelis, A. ^{[29
,30
]}

de Palma, F. ^{[13
,14
]}

do Couto e Silva, E. ^{[3
,4
]}

Drell, P. S. ^{[3
,4
]}

Dubois, R. ^{[3
,4
]}

Dumora, D. ^{[31
,32
]}

Farnier, C. ^{[26
]}

Favuzzi, C. ^{[13
,14
]}

Fegan, S. J. ^{[15
]}

Focke, W. B. ^{[3
,4
]}

机构：

[1] USN, Res Lab, Div Space Sci, Washington, DC 20375 USA

[2] Natl Acad Sci, Natl Res Council Res Associate, Washington, DC 20001 USA

[3] Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

[4] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

[5] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

[6] Univ Paris Diderot, Lab AIM, CEA IRFU CNRS, Serv Astrophys,CEA Saclay, F-91191 Gif Sur Yvette, France

[7] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

[8] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

[9] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[10] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy

[11] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy

[12] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy

[13] Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

[14] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

[15] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

[16] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[17] IEEC CSIC, Inst Ciencies Espai, Barcelona 08193, Spain

[18] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[19] Univ Coll Dublin, Dublin 4, Ireland

[20] INAF Ist Astrofis Spaziale Fis Cosm, I-20133 Milan, Italy

[21] ASI Sci Data Ctr, I-00044 Frascati, Roma, Italy

[22] CRESST, Greenbelt, MD 20771 USA

[23] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA

[24] Univ Maryland Baltimore Cty, Ctr Space Sci & Technol, Baltimore, MD 21250 USA

[25] George Mason Univ, Fairfax, VA 22030 USA

[26] Univ Montpellier 2, CNRS, IN2P3, Lab Phys Theor & Astroparticules, Montpellier, France

[27] Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden

[28] AlbaNova, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden

[29] Univ Udine, Dipartimento Fis, I-33100 Udine, Italy

[30] Ist Nazl Fis Nucl, Sez Trieste, Grp Coll Udine, I-33100 Udine, Italy

[31] Ctr Etud Nucl Bordeaux Gradignan, CNRS, IN2P3, UMR 5797, F-33175 Gradignan, France

[32] Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignan, UMR 5797, F-33175 Gradignan, France

[33] Ist Nazl Astrofis, Osservatorio Astron Trieste, I-34143 Trieste, Italy

[34] Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan

[35] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[36] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[37] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[38] Univ Alabama, Ctr Space Plasma & Aeron Res, Huntsville, AL 35899 USA

[39] Univ Grenoble 1, CNRS, Lab Astrophys Grenoble LAOG, UMR 5571, F-38041 Grenoble 09, France

[40] Ohio State Univ, Dept Phys, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA

[41] Waseda Univ, Res Inst Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan

[42] Tokyo Inst Technol, Dept Phys, Meguro, Tokyo 1528551, Japan

[43] RIKEN, Cosm Radiat Lab, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

[44] CNRS UPS, Ctr Etud Spatiale Rayonnements, F-31028 Toulouse 4, France

[45] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[46] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy

[47] Univ Denver, Dept Phys & Astron, Denver, CO 80208 USA

[48] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Hiroshima 7398526, Japan

[49] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[50] Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 714卷 / 01期

关键词：

gamma rays: galaxies; quasars: individual (3C 273); ACTIVE GALACTIC NUCLEI; VARIABILITY;

D O I：

10.1088/2041-8205/714/1/L73

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the light curves and spectral data of two exceptionally luminous gamma-ray outbursts observed by the Large Area Telescope experiment on board the Fermi Gamma-ray Space Telescope from 3C 273 in 2009 September. During these flares, having a duration of a few days, the source reached its highest gamma-ray flux ever measured. This allowed us to study, in some details, their spectral and temporal structures. The rise and the decay are asymmetric on timescales of 6 hr, and the spectral index was significantly harder during the flares than during the preceding 11 months. We also found that short, very intense flares put out the same time-integrated energy as long, less intense flares like that observed in 2009 August.

引用

页码：L73 / L78

页数：6

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