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Measurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S

A. Abramowski Fabio Acero 1 F. Aharonian A. G. Akhperjanian G. Anton S. Balenderan Agnès Balzer A. Barnacka Y. Becherini 2, 3 J. Becker Tjus K. Bernlöhr E. Birsin J. Biteau 2 A. Bochow C. Boisson J. Bolmont 4 P. Bordas J. Brucker F. Brun 2 P. Brun T. Bulik S. Carrigan S. Casanova M. Cerruti P. M. Chadwick A. Charbonnier 4 R. C. G. Chaves A. Cheesebrough G. Cologna J. Conrad C. Couturier M. Dalton M. K. Daniel I. D. Davids B. Degrange 2 C. Deil P. Dewilt H. J. Dickinson A. Djannati-Ataï 5 W. Domainko L. O'C. Drury G. Dubus K. Dutson J. Dyks M. Dyrda K. Egberts P. Eger P. Espigat 3 L. Fallon C. Farnier 1 S. Fegan 2 F. Feinstein 1 M. V. Fernandes D. Fernandez A. Fiasson 6 G. Fontaine 2 A. Förster M. Füßling M. Gajdus Y. A. Gallant 1 T. Garrigoux H. Gast B. Giebels 2 J. F. Glicenstein B. Glück D. Göring M. -H. Grondin S. Häffner J. D. Hague J. Hahn D. Hampf J. Harris S. Heinz G. Heinzelmann G. Henri G. Hermann A. Hillert J. A. Hinton W. Hofmann P. Hofverberg M. Holler D. Horns A. Jacholkowska 4 C. Jahn M. Jamrozy I. Jung M. A. Kastendieck K. Katarzyński U. Katz S. Kaufmann B. Khélifi 2 D. Klochkov W. Kluźniak T. Kneiske Nu. Komin 6 K. Kosack R. Kossakowski 6 F. Krayzel 6 H. Laffon 2 G. Lamanna 6 J. -P. Lenain D. Lennarz T. Lohse A. Lopatin C. -C. Lu V. Marandon Alexandre Marcowith 1 Julien Masbou 6 G. Maurin 6 N. Maxted M. Mayer T. J. L. Mccomb M. C. Medina J. Méhault 1 U. Menzler R. Moderski M. Mohamed Emmanuel Moulin C. L. Naumann 4 M. Naumann-Godo M. de Naurois 2 D. Nedbal N. Nguyen J. Niemiec S. J. Nolan S. Ohm E. de Oña Wilhelmi B. Opitz M. Ostrowski I. Oya M. Panter D. Parsons M. Paz Arribas N. W. Pekeur G. Pelletier J. Perez P. -O. Petrucci B. Peyaud S. Pita 3 G. Pühlhofer M. Punch 3 A. Quirrenbach M. Raue A. Reimer O. Reimer Matthieu Renaud 1 R. de Los Reyes F. Rieger J. Ripken L. Rob S. Rosier-Lees 6 G. Rowell B. Rudak C. B. Rulten V. Sahakian D. A. Sanchez A. Santangelo R. Schlickeiser A. Schulz U. Schwanke S. Schwarzburg S. Schwemmer F. Sheidaei 3 J. L. Skilton H. Sol G. Spengler Ł. Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch A. Szostek J. -P. Tavernet 4 R. Terrier 3 M. Tluczykont K. Valerius C. van Eldik George Vasileiadis 1 C. Venter A. Viana P. Vincent 4 H. J. Völk F. Volpe S. Vorobiov 1 M. Vorster S. J. Wagner M. Ward R. White A. Wierzcholska D. Wouters M. Zacharias A. Zajczyk A. A. Zdziarski A. Zech H. -S. Zechlin
Abstract : The extragalactic background light (EBL) is the diffuse radiation with the second highest energy density in the Universe after the cosmic microwave background. The aim of this study is the measurement of the imprint of the EBL opacity to gamma-rays on the spectra of the brightest extragalactic sources detected with the High Energy Stereoscopic System (H.E.S.S.). The originality of the method lies in the joint fit of the EBL optical depth and of the intrinsic spectra of the sources, assuming intrinsic smoothness. Analysis of a total of ~10^5 gamma-ray events enables the detection of an EBL signature at the 8.8 std dev level and constitutes the first measurement of the EBL optical depth using very-high energy (E>100 GeV) gamma-rays. The EBL flux density is constrained over almost two decades of wavelengths (0.30-17 microns) and the peak value at 1.4 micron is derived as 15 +/- 2 (stat) +/- 3 (sys) nW / m^2 sr.
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Submitted on : Monday, December 17, 2012 - 12:07:08 PM
Last modification on : Tuesday, January 25, 2022 - 12:48:11 PM

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A. Abramowski, Fabio Acero, F. Aharonian, A. G. Akhperjanian, G. Anton, et al.. Measurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S. Astronomy and Astrophysics - A&A, EDP Sciences, 2013, 550, pp.A4. ⟨10.1051/0004-6361/201220355⟩. ⟨in2p3-00765959⟩

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