Discovery of VHE γ-rays from the distant BL Lacertae 1ES0347-121

被引:110
作者
Aharonian, F. [1 ]
Akhperjanian, A. G.
de Almeida, U. Barres
Bazer-Bachi, A. R.
Behera, B.
Beilicke, M.
Benbow, W.
Bernloehr, K.
Boisson, C.
Bolz, O.
Borrel, V.
Braun, I.
Brion, E.
Brown, A. M.
Buehler, R.
Bulik, T.
Buesching, I.
Boutelier, T.
Carrigan, S.
Chadwick, P. M.
Chounet, L.-M.
Clapson, A. C.
Coignet, G.
Cornils, R.
Costamante, L.
Dalton, M.
Degrange, B.
Dickinson, H. J.
Djannati-Ataie, A.
Domainko, W.
Drury, L. O'C.
Dubois, F.
Dubus, G.
Dyks, J.
Egberts, K.
Emmanoulopoulos, D.
Espigat, P.
Farnier, C.
Feinstein, F.
Fiasson, A.
Foerster, A.
Fontaine, G.
Funk, Seb.
Fuessling, M.
Gallant, Y. A.
Giebels, B.
Glicenstein, J. F.
Glueck, B.
Goret, P.
Hadjichristidis, C.
机构
[1] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
[2] Yerevan Phys Inst, Yerevan 375036, Armenia
[3] CNRS, UPS, Ctr Etud Spatiale Rayonnements, Toulouse, France
[4] Univ Hamburg, Inst Exptphys, Hamburg, Germany
[5] Humboldt Univ, Inst Phys, Berlin, Germany
[6] Univ Paris Diderot, CNRS, LUTH, Observ Paris, Meudon, France
[7] Univ Durham, Dept Phys, Durham, England
[8] NW Univ, Unit Space Phys, Potchefstroom, South Africa
[9] IN2P3, CNRS, Ecole Polytech, Lab Leprince Ringuet, Palaiseau, France
[10] IN2P3, CNRS, Lab Annecy Le Vieux Phys Particules, Annecy Le Vieux, France
[11] Univ Paris 07, CNRS, Paris, France
[12] Univ Paris 07, CEA, CNRS, Observ Paris, F-75221 Paris 05, France
[13] Dublin Inst Adv Studies, Dublin 4, Ireland
[14] Heidelberg Univ, Landessternwarte Konigstuhl, Heidelberg, Germany
[15] Univ Montpellier 2, IN2P3, CNRS, Lab Phys Theor & Astroparticlues, Montpellier, France
[16] Univ Erlangen Nurnberg, Inst Phys, D-8520 Erlangen, Germany
[17] Univ Grenoble 1, CNRS, INSU, Lab Astrophys Grenoble, Grenoble, France
[18] Univ Tubingen, Inst Astron & Astrophys, Tubingen, Germany
[19] Univ Denis Diderot Paris 7, CNRS, IN2P3, LPNHE, Paris, France
[20] Univ Paris 06, CNRS, IN2P3, LPNHE, Paris, France
[21] Charles Univ Prague, Inst Particle & Nucl Phys, Prague, Czech Republic
[22] Ruhr Univ Bochum, Lehrstruhl Weltraum & Astrpohys 4, Inst Theoret Phys, D-44780 Bochum, Germany
[23] Univ Namibia, Windhoek, Namibia
[24] Uniwersytet Jagiellonski, Obserwatorium Astron, Krakow, Poland
[25] Nicolaus Copernicus Astron Ctr, Warsaw, Poland
[26] Univ Leeds, Sch Phys & Astron, Leeds, W Yorkshire, England
[27] Univ Adelaide, Sch Chem & Phys, Adelaide, SA, Australia
[28] Nicholas Copernicus Univ, Torun Ctr Astron, Torun, Poland
关键词
galaxies : BL Lacertae objects : individual : 1ES0347-121; gamma rays : observations; cosmology : diffuse radiation; galaxies : BL Lacertae objects : general; galaxies : active;
D O I
10.1051/0004-6361:20078412
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Aims. Our aim is to study the production mechanism for very-high-energy (VHE; > 100 GeV) gamma-rays in distant active galactic nuclei (AGN) and use the observed VHE spectrum to derive limits on the Extragalactic Background Light (EBL). We also want to determine physical quantities through the modeling of the object's broad-band spectral energy distribution (SED). Methods. VHE observations (similar to 25 h live time) of the BL Lac 1ES 0347-121 (redshift z = 0.188) were conducted with the High Energy Stereoscopic System (HESS) between August and December 2006. Contemporaneous X-ray and UV/optical observations from the SWIFT satellite are used to interpret the SED of the source in terms of a synchrotron self Compton (SSC) model. Results. An excess of 327 events, corresponding to a statistical significance of 10.1 standard deviations, is detected from 1ES 0347-121. Its photon spectrum, ranging from similar to 250 GeV to similar to 3 TeV, is well described by a power law with a photon index of Gamma = 3.10 +/- 0.23(stat) +/- 0.10(sys). The integral flux above 250GeV corresponds to similar to 2% of the flux of the Crab Nebula above the same threshold. No VHE flux variability is detected within the data set. Conclusions. Constraints on the EBL density at optical to near-infrared wavelengths derived from the photon spectrum of 1ES 0347121 are close to the strongest limits derived previously. The strong EBL limits confirm earlier findings, that the EBL density in the near-infrared is close to the lower limits from source counts. This implies that the universe is more transparent to VHE gamma-rays than previously believed. An SSC model provides a reasonable description of the contemporaneous SED.
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页码:L25 / +
页数:6
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