A low level of extragalactic background light as revealed by γ-rays from blazars

  title={A low level of extragalactic background light as revealed by $\gamma$-rays from blazars},
  author={Felix Aharonian and A. G. Akhperjanian and A. R. Bazer-Bachi and Matthias Beilicke and W. Benbow and David Berge and Konrad Bernl{\"o}hr and Catherine Boisson and O. Bolz and V. Borrel and Ilana M. Braun and Frank Breitling and A. M. Brown and Paula M Chadwick and L. M. Chounet and R. Cornils and L Costamante and B. Degrange and Hugh Dickinson and Arache Djannati-Ata{\"i} and Luke O'c. Drury and Guillaume Dubus and D. Emmanoulopoulos and P. Espigat and Fabrice Feinstein and Gilles Fontaine and Yael Fuchs and Stefan Funk and Yves A. Gallant and Berrie Giebels and Stefan Gillessen and J. F. Glicenstein and Philippe Goret and C. Hadjichristidis and Dominik Hauser and Marcus Hauser and G{\"o}tz Heinzelmann and Gilles Henri and German Hermann and J. A. Hinton and W. Hofmann and M. Holleran and Dieter Horns and A. Jacholkowska and Ocker C. de Jager and B. Kh{\'e}lifi and Stephanie Klages and Nu. Komin and Alexander K. Konopelko and I. J. Latham and Roland Le Gallou and Anne Lemi{\`e}re and M. Lemoine-Goumard and Nicolas Leroy and Thomas Lohse and J. M. Martin and Olivier Martineau-Huynh and Alexandre Marcowith and Conor Masterson and T. J. L. Mccomb and Mathieu de Naurois and S. J. Nolan and Aristeidis Noutsos and K. J. Orford and J. L. Osborne and Mohamed Ouchrif and Mike Panter and Guy B. Pelletier and Santiago Pita and Gerd P{\"u}hlhofer and M. Punch and B. C. Raubenheimer and Martin Raue and Julie Raux and Stephen Mark Rayner and A. Reimer and O. Reimer and Joachim Ripken and L. Rob and Lo{\"i}c Rolland and Gavin Rowell and Vardan Sahakian and Ludovic Sauge and Stefan Schlenker and Reinhard Schlickeiser and C. U. Schuster and U. Schwanke and Mark Siewert and H'elene Sol and D. Spangler and Riaan Steenkamp and Christian M Stegmann and J-P. Tavernet and R. Terrier and Claude G. Th{\'e}oret and Martin Tluczykont and Christopher van Eldik and Georges Vasileiadis and Christo Venter and Pascal Vincent and H. J. V{\"o}lk and S. J. Wagner},
The diffuse extragalactic background light consists of the sum of the starlight emitted by galaxies through the history of the Universe, and it could also have an important contribution from the ‘first stars’, which may have formed before galaxy formation began. Direct measurements are difficult and not yet conclusive, owing to the large uncertainties caused by the bright foreground emission associated with zodiacal light. An alternative approach is to study the absorption features imprinted on… 

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