022 Alikhrion" Broed ="/St.sik75036 Yd.os:a,Sitzwillg, Germany"> Ejquer Chl En N="obll" content="National Academy ofScny"> Ejquer Chl En risca"> "styigh-E type=Pmultis,SInstitut itut Ameterdam,n" contepPDEk 904, 1098 XH Ameterdam,nTd SNeed = Gernt="Centre for Space Researaronianame="citatSnsBernharrmany"> Teilabbeland"> Leopold-Fr:azens-ion_author_inInnsbruc> 6020nInnsbruc> Aumagehaussee 149, 22761 Hamburg, Germany"> "H.E.S.S. füion_author_inTübiegenstSe> 1ü72076nTübiegenstitution" content="National Academy ofScny"> "H.E.S.S. füion_author_inTübiegenstSe> 1ü72076nTübiegenstitution" content="National Academy ofScny"> "H.E.S.S. füion_author_inTübiegenstSe> 1ü72076nTübiegenstitution" content="National Academy ofScny"> N="obll" content="National Academy ofScny"> aation" c, Td SInstitut itut Lei69ster, Institut y Road, Lei69ster, LE1 7RH, IK" content="National Academy ofScny"> Ejquer Chl En ei, South Africa"> "H.E.S.S. füion_author_inTübiegenstSe> 1ü72076nTübiegenstitution" content="National Academy ofScny"> Leopold-Fr:azens-ion_author_inInnsbruc> 6020nInnsbruc> Aumagehaussee 149, 22761 Hamburg, Germany"> rif.cssttis,SNicoeik, Cornpnyp s Institut füGrudziadzka 5,S87-100 Torunür Germany"> "stent="Ue> aation"citihl e for A (ISAS)ü3-1-1 Yo_ainodai,SChuo-ku, Sagami POmeta rHgawlg k In abbeland"> LitatznsBackent="Centre forrai POmeta9atzn Katsuragawlg, Germany"> Kństz content="F. 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VnsFernond s SouthŁ.nealcon-Pllm 2520, Agency (JAXA), risca"> "stent="Ue> aationcléain" et espHme= < E typi < (LPNHE),n4ent=69 J ssieu, 75phypPDE s Cedex 5,SFr:ana content="Dublin Institute for Aname="citatMnsJamroRnspteenkampt="Dublin Institute for Advanced Studies, 31 FitLoom 25oin" LeprO Box4amiba,,nE.St type==Pmultis,SErwPrintee fog 133 149Windh " ,x4amiba,itation_auname="citatzn Janiak South Africa pteg="citation_author_Gns_anrtion_author" content="F. 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1 Centre forsSabce Research, North-West University, Po.chef Insom 2520, South Africa
2 Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany
3 aMax-Planck-Institut für Kernphysik, PO Box 103980, 69029 Heidelberg, Germany
4 Dublin Institute forsAdvanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland
5 National Academy ofSciences of the Republic of Armenia, aMaishall BaghramibnuAvenue, 24, 0019 Yerevan, Republic of Armenia
6 Yerevan Physics Institute, 2 Alikhanian Brothers St., 375036 Yerevan, Armenia
7 Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
8 University of Namibia, Department of Physics, Private Bag 13301, Windhoek, Namibia
9 GRAPPA, AntonsPannekoek Institute forsA Insnomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
10 Department of Physics and Electrical Engineering, Linnaeus University, 351 95 Växjö, Sweden
11 Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und A Insphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
12 GRAPPA, AntonsPannekoek Institute forsA Insnomy and Institute of High-Entrgy Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
13 Institut für A Ins- und Teilchenphysik, Leopold-Franzens-Universität Innsbruc , 6020 Innsbruc , Au Inia
14sSchool of Physical Sciences, University of Adelaide, Adelaide 5005, Au Inalia
15 LUTH, Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, 5 Place Jules Janssen, 92190 Meudon, France
16 Sorbonne Universités, UPMC Université Paris 06, Université Paris Diderot, Sorbonne Paris, Cité, CNRS, Lab"catoire de Physique Nucléaire et de Hmmees Entrgies (LPNHE), 4 place Jussieu, 75252 Paris Cedex 5, France
17 Lab"catoire Univers et Pbbelaules de Montpellier, Université Montpellier, CNRS/IN2P3, CC 72, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
18 DSM/Irfu, CEA Samluy, 91191 Gif-Sur-Yvette Cedex, France
19 A Insnomical Observatory, The University of Waisaw, Al. Ujazdsus Ie 4, 00-478 Waisaw, Poland
20 AixaMaiseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 aMaiseille, France
21 Instytut Fizyki Ja¸drowej PAN, ul. Radziksus Iego 152, 31-342 Kraków, Poland
22sSchool of Physics, University of the Witwatersiond, 1 Jan SmutsuAvenue, Braamfontein, Johannesburg 2050, South Africa
23 Lab"catoire d’Annecy-le-Vieux de Physique des Pbbelaules, Université Savoie Mont-Blanc, CNRS/IN2P3, 74941 Annecy-le-Vieux, France
24 Landessternwbbee, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany
25 Université Bordeaux, CNRS/IN2P3, Centre d’Études Nucléaires de Bordeaux Gradignan, 33175 Gradignan, France
26 Oskar Klein Centre, Department of Physics, Stockholm University, Albanova University Center, 10691 Stockholm, Sweden
27 Institut für A Insnomie und A Insphysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
28 Lab"catoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, 91128 Palaiseau, France
29 APC, A InsPbbelaule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, Sorbonne Paris Cité, 10 rue Alice Domonset Léonie Duquet, 75205 Paris Cedex 13, France
30 UnivnsGrenoble Alpes, IPAG; CNRS, IPAG, 38000 Grenoble, France
31 Department of Physics and A Insnomy, The University of Leicester, University Road, Leicester, LE1 7RH, UK
32sNicolaus Copernicus A Insnomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Waisaw, Poland
33 Institut für Physik und A Insnomie, Universität Potsdam, Karl-Liebknecht-SInasse 24/25, 14476 Potsdam, Germany
34 Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre forsA Inspbbeland Physics, Erwin-Rommel-SIn. 1, 91058 Erlangen, Germany
35 DESY, 15738 Zeuthen, Germany
36 Obserwatorium A Insnomiczne, Uniwersytet Jagiellońs I, ul. Orla 171, 30-244 Kraków, Poland
37 Centre forsA Insnomy, Faaulty of Physics, A Insnomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland
38 Department of Physics, University of the FreesStaee, PO Box 339, Bloemfontein 9300, South Africa
39 ITA Universität Heidelberg, 69120 Heidelberg, Germany
40 GRAPPA, Institute of High-Entrgy Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
41 Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Jaabnu
42sJaabnAerpsabce Expl"cationsAgency (JAXA), Institute of Sabce and A Insnmmeical Science (ISAS), 3-1-1 YoshinodaI, Chuo-ku, Sagamihara, Kanag wa 229-8510, Jaabnu
43 Now at The School of Physics, The University of New South Wales, Sydney 2052, Au Inalia

Received: 19aMay 2017
Accepted: 13 July 2017

Ab Inact

Very high-entrgy γ rays (VHE, E ≳ 100 GeV) pnspbgating over cosmological distances cbnuinteract wi. the low-entrgy photons of the extrag laceic background light (EBL) and pnsduce electron-positron pairs. The transabrency of the Universe to VHE γ rays is then directly related to the spectral entrgy distributions(SED) of the EBL. The observationsof features in the VHE entrgy spectrasof extrag laceic sources allows the EBL to be measured, which otherwise is very difflault. An EBL model-independent measurement of the EBL SED wi. the H.E.S.S. array of Cherenkov telescopes is presented. It was obtained by extracting the EBL absorptionssignal from the reanalysis of high-quality spectrasof blazars. From H.E.S.S. data alone the EBL signature is detected at a signiflaance of 9.5σ, and the intensity of the EBL obtained in different spectral bands is presented together wi. the utiociated γ-ray horizon.

Key words: gamma rays: g laxies / BL Lbcertae objects: gentral / cosmic background radiations/ infrbred: diffuse background


Deceased.

Corresponding mme="cs: H.E.S.S. Collab"cation, e-mail: contact.hess@hess-experiment.eu

© ESO, 2017

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