Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303

  title={Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303},
  author={Justin E Albert and Ester Aliu and H. Anderhub and P. Antoranz and A. Armada and Mar{\'i}a Asensio and C. Baixeras and J. A. Barrio and Michael Bartelt and Hendrik Bartko and Denis Bastieri and Sathyanarayan Reddy Bavikadi and W. Bednarek and Karsten Berger and Ciro Bigongiari and Adrian Biland and Erica Bisesi and R. K. Bock and Pol Bordas and Valenti Bosch-Ramon and Thomas Bretz and Ilia Britvitch and M. Camara and Emiliano Carmona and Ashot A. Chilingarian and Stefano Ciprini and J. A. Coarasa and Sebastian Commichau and J. L. Contreras and J. Cortina and Valentin Curtef and Varuzhan Danielyan and Francesco Dazzi and Alessandro De Angelis and Raquel de los Reyes and B. De Lotto and Eva Domingo-Santamarı́a and Daniela Dorner and Michele Doro and M. Errando and Michela Fagiolini and Daniel Ferenc and Enrique Fern{\'a}ndez and Roger Firpo and Josep Flix and M. Victoria Fonseca and Ll. Font and M Fuchs and Nicola Galante and M. Garczarczyk and Markus Gaug and Maria Giller and Florian Goebel and D. Hakobyan and Morihiro Hayashida and Thomas Hengstebeck and D. H{\"o}hne and Juergen Hose and C. C. Hsu and Paula Gina Isar and P. Jacon and O. Kalekin and Ralf Kosyra and Daniel Kranich and M. Laatiaoui and A. Laille and T. Lenisa and Patricia Liebing and Eila Lindfors and S. Lombardi and Francesco Longo and J. M. Lopez and M. Rutz Lopez and Eckart Lorenz and Franco Lucarelli and P. Majumdar and Galina Maneva and Karl Mannheim and Oriana Mansutti and Mose Mariotti and M. Mart{\'i}nez and Keiichi Mase and D. Mazin and C. Merck and M. Meucci and Manuel Meyer and J. M. Miranda and R. Mirzoyan and Satoko Mizobuchi and A. Moralejo and K. Nilsson and Emma de O{\~n}a-Wilhelmi and Raul Orduna and N. Otte and Igor Oya and D. Paneque and Riccardo Paoletti and Josep Maria Paredes and Mikko Pasanen and Donatella Pascoli and Felicitas Pauss and Nikolaj A. Pavel and R. G. Pegna and Massimo Persic and L. Peruzzo and Alessio Piccioli and Marianne Poller and Guy G. Pooley and E. Prandini and A. Raymers and Wolfgang Rhode and Marc Rib{\'o} and J. Rico and B. Riegel and Michael Rissi and Anne Robert and Gustavo E. Romero and S. R{\"u}gamer and Antonio Saggion and A. S{\'a}nchez and P. Sartori and Villi Scalzotto and Valeria Scapin and Robert Schmitt and Thomas Schweizer and Maxim Shayduk and Kenji Shinozaki and Steven N. Shore and N{\'u}ria Sidro and Aimo Sillanp{\"a}{\"a} and D. Sobczynska and A. Stamerra and Luisa Sabrina Stark and Leo O. Takalo and P. Temnikov and Diego Tescaro and Masahiro Teshima and Nadia Tonello and Antoni Torres and Diego F. Torres and Nicola Turini and H. P. Vankov and Vincenzo Vitale and R. Mark Wagner and Tadeusz Wibig and Wolfgang Wittek and Roberta Zanin and J. Zapatero},
  pages={1771 - 1773}
Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two… 
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