%0 Journal Article
%T New constraints on the Mid-IR EBL from the HESS discovery of VHE gamma rays from 1ES 0229+200
%+ Centre d'étude spatiale des rayonnements (CESR)
%+ Laboratoire Univers et Théories (LUTH (UMR_8102))
%+ Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA)
%+ Laboratoire d'Astrophysique de Grenoble (LAOG)
%+ Laboratoire Leprince-Ringuet (LLR)
%+ Laboratoire d'Annecy de Physique des Particules (LAPP)
%+ AstroParticule et Cosmologie (APC (UMR_7164))
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%+ Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE)
%+ APC - Astrophysique des Hautes Energies (APC - AHE)
%A Aharonian, F.
%A Akhperjanian, A.G.
%A Barres de Almeida, U.
%A Bazer-Bachi, A.R.
%A Behera, B.
%A Beilicke, M.
%A Benbow, W.
%A Bernlohr, K.
%A Boisson, C.
%A Bolz, O.
%A Borrel, V.
%A Braun, I.
%A Brion, E.
%A Brown, A.M.
%A Buhler, R.
%A Bulik, T.
%A Busching, I.
%A Boutelier, T.
%A Carrigan, S.
%A Chadwick, P.M.
%A Chounet, L.-M.
%A Clapson, A.C.
%A Coignet, G.
%A Cornils, R.
%A Costamante, L.
%A Dalton, M.
%A Degrange, B.
%A Dickinson, H.J.
%A Djannati-Atai, A.
%A Domainko, W.
%A Drury, L.O'C.
%A Dubois, F.
%A Dubus, G.
%A Dyks, J.
%A Egberts, K.
%A Emmanoulopoulos, D.
%A Espigat, P.
%A Farnier, C.
%A Feinstein, F.
%A Fiasson, A.
%A Forster, A.
%A Fontaine, G.
%A Funk, Seb.
%A Fusling, M.
%A Gallant, Y.A.
%A Giebels, B.
%A Glicenstein, J.F.
%A Gluck, B.
%A Goret, P.
%A Hadjichristidis, C.
%A Hauser, D.
%A Hauser, M.
%A Heinzelmann, G.
%A Henri, G.
%A Hermann, G.
%A Hinton, J.A.
%A Hoffmann, A.
%A Hofmann, W.
%A Holleran, M.
%A Hoppe, S.
%A Horns, D.
%A Jacholkowska, A.
%A de Jager, O.C.
%A Jung, I.
%A Katarzynski, K.
%A Kendziorra, E.
%A Kerschhaggl, M.
%A Khelifi, B.
%A Keogh, D.
%A Komin, Nu.
%A Kosack, K.
%A Lamanna, G.
%A Latham, I.J.
%A Lemiere, A.
%A Lemoine-Goumard, M.
%A Lenain, J.-P.
%A Lohse, T.
%A Martin, J.M.
%A Martineau-Huynh, O.
%A Marcowith, A.
%A Masterson, C.
%A Maurin, D.
%A Maurin, G.
%A Mccomb, T.J.L.
%A Moderski, R.
%A Moulin, Emmanuel
%A de Naurois, M.
%A Nedbal, D.
%A Nolan, S.J.
%A Ohm, S.
%A Olive, J.-P.
%A de Ona Wilhelmi, E.
%A Orford, K.J.
%A Osborne, J.L.
%A Ostrowski, M.
%A Panter, M.
%A Pedaletti, G.
%A Pelletier, G.
%A Petrucci, P.-O.
%A Pita, S.
%A Puhlhofer, G.
%A Punch, M.
%A Ranchon, S.
%A Raubenheimer, B.C.
%A Raue, M.
%A Rayner, S.M.
%A Renaud, M.
%A Ripken, J.
%A Rob, L.
%A Rolland, L.
%A Rosier-Lees, S.
%A Rowell, G.
%A Rudak, B.
%A Ruppel, J.
%A Sahakian, V.
%A Santangelo, A.
%A Schlickeiser, R.
%A Schock, F.
%A Schroder, R.
%A Schwanke, U.
%A Schwarzburg, S.
%A Schwemmer, S.
%A Shalchi, A.
%A Sol, H.
%A Spangler, D.
%A Stawarz, L.
%A Steenkamp, R.
%A Stegmann, C.
%A Superina, G.
%A Tam, P.H.
%A Tavernet, J.-P.
%A Terrier, R.
%A van Eldik, C.
%A Vasileiadis, G.
%A Venter, C.
%A Vialle, J.P.
%A Vincent, P.
%A Vivier, M.
%A Volk, H.J.
%A Volpe, F.
%A Wagner, S.J.
%A Ward, M.
%A Zdziarski, A.A.
%A Zech, A.
%Z 5 pages, 4 figures;
%< avec comité de lecture
%Z PTA/07-44, APC-07-107
%@ 0004-6361
%J Astronomy and Astrophysics - A&A
%I EDP Sciences
%V 475
%P L9-L13
%8 2007
%D 2007
%Z 0709.4584
%Z 2007A&A...475L...9A
%R 10.1051/0004-6361:20078462
%K galaxies: BL lacertae objects: individual: 1ES 
%K 0229+200
%K gamma rays: observations
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]
%Z Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]Journal articles
%X Aims:To investigate the very high energy (VHE: >100 GeV) γ-ray emission from the high-frequency peaked BL Lac 1ES 0229+200. Methods: Observations of 1ES 0229+200 at energies above 580 GeV were performed with the High Energy Stereoscopic System (HESS) in 2005 and 2006. Results: 1ES 0229+200 is discovered by HESS to be an emitter of VHE photons. A signal is detected at the 6.6σ level in the HESS observations (41.8 h live time). The integral flux above 580 GeV is (9.4±1.5_stat±1.9_syst) × 10-13 cm-2 s-1, corresponding to ~1.8% of the flux observed from the Crab Nebula. The data show no evidence for significant variability on any time scale. The observed spectrum is characterized by a hard power law (Γ = 2.50±0.19_stat±0.10_syst) from 500 GeV to ~15 TeV. Conclusions: The high-energy range and hardness of the observed spectrum, coupled with the object's relatively large redshift (z = 0.1396), enable the strongest constraints so far on the density of the Extragalactic Background Light (EBL) in the mid-infrared band. Assuming that the emitted spectrum is not harder than Γ_int ≈ 1.5, the HESS data support an EBL spectrum ∝λ-1 and density close to the lower limit from source counts measured by Spitzer, confirming the previous indications from the HEGRA data of 1ES 1426+428 (z=0.129). Irrespective of the EBL models used, the intrinsic spectrum of 1ES 0229+200 is hard, thus locating the high-energy peak of its spectral energy distribution above a few TeV.
%G English
%Z HESS
%L in2p3-00175791
%U https://hal.in2p3.fr/in2p3-00175791
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