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

@article{Abramowski2013MeasurementOT,
title={Measurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S.},
author={H.E.S.S. collaboration A. Abramowski and Fabio Acero and Felix Aharonian and A. G. Akhperjanian and Gisela Anton and Shangkari Balenderan and Arnim Balzer and Anna Barnacka and Y Becherini and Julia K. Becker Tjus and Konrad Bernlohr and Emrah Birsin and Jonathan Biteau and Anne Bochow and Catherine Boisson and Julien Bolmont and Pol Bordas and J. Brucker and F. Brun and P. Brun and Tomasz Bulik and Svenja Carrigan and S. Casanova and M. Cerruti and Paula M Chadwick and Ald{\'e}e Charbonnier and Ryan C. G. Chaves and A. Cheesebrough and Gabriele Cologna and Janet M. Conrad and C. Couturier and Matthew Dalton and M. K. Daniel and I. D. Davids and B. Degrange and Christoph Deil and P. deWilt and Hugh Dickinson and Arache Djannati-Atai and Wilfried F. Domainko and Luke O'c. Drury and Guillaume Dubus and Kathleen Dutson and Jarosław Dyks and Michal Dyrda and Kathrin Egberts and Peter Eger and P. Espigat and Lisa Fallon and Christian Farnier and Stephen Fegan and Fabrice Feinstein and Milton Virg{\'i}lio Fernandes and Diane Fernandez and A. Fiasson and Gilles Fontaine and Andreas Forster and Matthias Fussling and Michael Gajdus and Yves A. Gallant and Tania Garrigoux and Henning Gast and Berrie Giebels and J. F. Glicenstein and B. Gluck and D. Goring and M.-H. Grondin and S. Haffner and John D. Hague and Joachim Hahn and Daniel Hampf and J. Harris and Sebastian Heinz and G{\"o}tz Heinzelmann and Gilles Henri and German Hermann and Andreas Hillert and J. A. Hinton and W. Hofmann and Petter Hofverberg and Markus Holler and Dieter Horns and A. Jacholkowska and Constanze Jahn and Marek Jamrozy and Ira Jung and Max Anton Kastendieck and K. Katarzy'nski and Uli Katz and Sarah Kaufmann and Bruno Kh'elifi and Dmitry Klochkov and Wlodek Klu'zniak and Tanja M. Kneiske and Nu. Komin and K. Kosack and R. Kossakowski and Fabien Krayzel and H'elene Laffon and Giovanni Lamanna and J.-P. Lenain and Dirk Lennarz and Thomas Lohse and Anatoli N. Lopatin and C.-C. Lu and V. Marandon and Alexandre Marcowith and Julien Masbou and Gilles Maurin and Nigel I. Maxted and Matthias P. Mayer and T. J. L. Mccomb and Maria Clara Medina and J. M'ehault and Ulf Menzler and Rafal Moderski and Mahmoud Mohamed and Emmanuel Moulin and Christopher Lindsay Naumann and Melitta Naumann-Godo and Mathieu de Naurois and Dalibor Nedbal and Nelly Nguyen and Jacek Niemiec and S. J. Nolan and S. Ohm and Emma de O{\~n}a Wilhelmi and B. Opitz and Michał Ostrowski and Igor Oya and Mike Panter and Dan Parsons and Manuel Paz Arribas and Nikki Pekeur and Guy B. Pelletier and J. Valero P{\'e}rez and P.-O. Petrucci and Bernard Peyaud and Santiago Pita and Gerd Puhlhofer and M. Punch and Andreas Quirrenbach and Martin Raue and A. Reimer and O. Reimer and Matthieu Renaud and Raquel de los Reyes and Frank M. Rieger and Joachim Ripken and L. Rob and S. Rosier-Lees and Gavin Rowell and B. Rudak and Cameron B Rulten and Vardan Sahakian and D. A. Sanchez and A. Santangelo and Reinhard Schlickeiser and Alexander Schulz and U. Schwanke and Stefan Schwarzburg and Stefanie Schwemmer and Farzaneh Sheidaei and Joanna Skilton and H'elene Sol and Gerrit Spengler and Lukasz Stawarz and Riaan Steenkamp and Christian M Stegmann and F. Stinzing and Kornelia Stycz and Iurii Sushch and Anna Z. Sz{\'o}stek and J-P. Tavernet and R. Terrier and Martin Tluczykont and Kathrin Valerius and Christopher van Eldik and Georges Vasileiadis and Christo Venter and Aion Viana and Pascal Vincent and Heinrich J. Volk and Francesca Volpe and Serguei Vorobiov and Martine Vorster and S. J. Wagner and Martin J. Ward and R. M. White and Alicja Wierzcholska and Denis Wouters and Michael Zacharias and Anna Zajczyk and Andrzej A. Zdziarski and Andreas Zech and Hannes-S. Zechlin},
journal={Astronomy and Astrophysics},
year={2013},
volume={550},
pages={1-11}
}
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…
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