# Fast Variability of TeraElectron Volt γ Rays from the Radio Galaxy M87

@article{Aharonian2006FastVO,
title={Fast Variability of TeraElectron Volt $\gamma$ Rays from the Radio Galaxy M87},
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 A. M. Brown and Rolf B{\"u}hler and I. B{\"u}sching and Svenja Carrigan and Paula M Chadwick and L. M. Chounet and Nicolas Produit 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 Kathrin Egberts and D. Emmanoulopoulos and P. Espigat and Fabrice Feinstein and Enrico Ferrero and A. Fiasson and Gilles Fontaine and S. Funk and S. Funk and Matthias F{\"u}{\ss}ling and Yves A. Gallant and Berrie Giebels 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 A. Hoffmann and W. Hofmann and M. Holleran and Silke Hoppe and Dieter Horns and A. Jacholkowska and O. C. de Jager and Eckhard Kendziorra and Matthias Kerschhaggl and B. Kh{\'e}lifi and Nu. Komin and Alexander K. Konopelko and K. Kosack and Giovanni Lamanna and I. J. Latham and R. Le Gallou and Anne Lemi{\e}re and M. Lemoine-Goumard and J.-P. Lenain and Thomas Lohse and J. M. Martin and Olivier Martineau-Huynh and Alexandre Marcowith and Conor Masterson and Gilles Maurin and T. J. L. Mccomb and Emmanuel Moulin and Mathieu de Naurois and Dalibor Nedbal and S. J. Nolan and Aristeidis Noutsos and K. J. Orford and J. L. Osborne and M. Ouchrif and Mike Panter and Guy B. Pelletier and Santiago Pita and Gerd P{\"u}hlhofer and M. Punch and S. Ranchon and B. C. Raubenheimer and Martin Raue and Stephen Mark Rayner and A. Reimer and Joachim Ripken and L. Rob and Lo{\"i}c Rolland and S. Rosier-Lees and Gavin Rowell and Vardan Sahakian and A. Santangelo and Ludovic Sauge and Stefan Schlenker and Reinhard Schlickeiser and R. Schr{\"o}der and U. Schwanke and Stefan Schwarzburg and Stefanie Schwemmer and Andreas Shalchi and H'elene Sol and D. Spangler and Felix Spanier and Riaan Steenkamp and Christian M Stegmann and Giulia Superina and P. H. Thomas Tam and J-P. Tavernet and R. Terrier and Martin Tluczykont and C. van Eldik and Georges Vasileiadis and Christo Venter and J. P. Vialle and Pascal Vincent and H. J. V{\"o}lk and Stefan J. Wagner and Martin J. Ward},
journal={Science},
year={2006},
volume={314},
pages={1424 - 1427}
}`
The detection of fast variations of the tera–electron volt (TeV) (1012 eV) γ-ray flux, on time scales of days, from the nearby radio galaxy M87 is reported. These variations are about 10 times as fast as those observed in any other wave band and imply a very compact emission region with a dimension similar to the Schwarzschild radius of the central black hole. We thus can exclude several other sites and processes of the γ-ray production. The observations confirm that TeV γ rays are emitted by… Expand
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