Discovery of very high energy γ-ray emission from the BL Lacertae object H2356-309 with the HESS Cherenkov telescopes

被引：62
|
作者：
Aharonian, F.
Akhperjanian, A. G.
Bazer-Bachi, A. R.
Beilicke, M.
Benbow, W.
Berge, D.
Bernloehr, K.
Boisson, C.
Bolz, O.
Borrel, V.
Braun, I.
Breitling, F.
Brown, A. M.
Buehler, R.
Busching, I.
Carrigan, S.
Chadwick, P. M.
Chounet, L. -M.
Cornils, R.
Costamante, L.
Degrange, B.
Dickinson, H. J.
Djannati-Atai, A.
Drury, L. O'C.
Dubus, G.
Egberts, K.
Emmanoulopoulos, D.
Espigat, P.
Feinstein, F.
Ferrero, E.
Fontaine, G.
Funk, Seb.
Funk, S.
Gallant, Y. A.
Giebels, B.
Glicenstein, J. F.
Goret, P.
Hadjichristidis, C.
Hauser, D.
Hauser, M.
Heinzelmann, G.
Henri, G.
Hermann, G.
Hinton, J. A.
Hofmann, W.
Holleran, M.
Horns, D.
Jacholkowska, A.
de Jager, O. C.
Khelifi, B.
机构：
[1] DESY, D-15735 Zeuthen, Germany
[2] Yerevan Phys Inst, Yerevan 375036, Armenia
[3] UPS, CNRS, Ctr Etud Spatiale Rayonnements, Toulouse, France
[4] Univ Hamburg, Inst Expt Phys, Hamburg, Germany
[5] Humboldt Univ, Inst Phys, Berlin, Germany
[6] CNRS, LUTH, UMR 8102, Observ Paris,Sect Meudon, Meudon, France
[7] Univ Durham, Dept Phys, Durham, England
[8] NW Univ, Unit Space Phys, Potchefstroom, South Africa
[9] Ecole Polytech, CNRS, Lab Leprince Ringuet, IN2P3, F-91128 Palaiseau, France
[10] Univ Paris 07, CEA, UMR 7164, CNRS, F-75221 Paris 05, France
[11] APC, Paris, France
[12] Dublin Inst Adv Studies, Dublin 4, Ireland
[13] Heidelberg Univ, Landessternwarte, Heidelberg, Germany
[14] Univ Montpellier 2, Lab Phys Theor & Astroparticules, IN2P3, CNRS, Montpellier, France
[15] CEA, DSM, DAPNIA, Saclay, France
[16] Univ Grenoble 1, CNRS, INSU, Astrophys Lab, F-38041 Grenoble, France
[17] Univ Tubingen, Inst Astron & Astrophys, Tubingen, Germany
[18] Univ Paris 06, Lab Phys Nucl & Hautes Energies, IN2P3, CNRS, F-75252 Paris 05, France
[19] Univ Paris 07, Paris, France
[20] Charles Univ Prague, Inst Particle & Nucl Phys, Prague, Czech Republic
[21] Ruhr Univ Bochum, Inst Theoret Phys, D-4630 Bochum, Germany
[22] Univ Namibia, Windhoek, Namibia
[23] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
来源：
ASTRONOMY & ASTROPHYSICS | 2006年 / 455卷 / 02期
关键词：
gamma rays : observations; galaxies : active; galaxies : BL Lacertae objects : individual : H2356-309;
D O I：
10.1051/0004-6361:20054732
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The extreme synchrotron BL Lac object H2356-309, located at a redshift of z = 0.165, was observed from June to December 2004 with a total exposure of approximate to 40 h live-time with the HESS (High Energy Stereoscopic System) array of atmospheric-Cherenkov telescopes (ACTs). Analysis of this data set yields, for the first time, a strong excess of 453 gamma-rays (10 standard deviations above background) from H2356-309, corresponding to an observed integral flux above 200 GeV of I(> 200 GeV) = (4.1 +/- 0.5) x 10(-12) cm(-2) s(-1) (statistical error only). The differential energy spectrum of the source between 200 GeV and 1.3 TeV is well-described by a power law with a normalisation (at 1 TeV) of N-0 = (3.00 +/- 0.80(stat) +/- 0.31(sys)) x 10(-13) cm(-2) s(-1) TeV-1 and a photon index of Gamma = 3.09 +/- 0.24(stat) +/- 0.10(sys). H2356-309 is one of the most distant BL Lac objects detected at very-high-energy-rays so far. Results from simultaneous observations from ROTSE-III (optical), RXTE (X-rays) and NRT (radio) are also included and used together with the HESS data to constrain a single-zone homogeneous synchrotron self-Compton (SSC) model. This model provides an adequate fit to the HESS data when using a reasonable set of model parameters.
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收藏
页码：461 / 466
页数：6
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