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26 April 2024

» arxiv » 1111.6572

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Detection of the gamma-ray binary LS I +61 303 in a low flux state at Very High Energy gamma-rays with the MAGIC Telescopes in 2009
MAGIC Collaboration ; J. Aleksić ; E. A. Alvarez ; L. A. Antonelli ; P. Antoranz ; M. Asensio ; M. Backes ; J. A. Barrio ; D. Bastieri ; J. Becerra González ; W. Bednarek ; A. Berdyugin ; K. Berger ; E. Bernardini ; A. Biland ; O. Blanch ; R. K. Bock ; A. Boller ; G. Bonnoli ; D. Borla Tridon ; V. Bosch-Ramon ; I. Braun ; T. Bretz ; A. Cañellas ; E. Carmona ; A. Carosi ; P. Colin ; E. Colombo ; J. L. Contreras ; J. Cortina ; L. Cossio ; S. Covino ; F. Dazzi ; A. De Angelis ; G. De Caneva ; E. De Cea del Pozo ; B. De Lotto ; C. Delgado Mendez ; A. Diago Ortega ; M. Doert ; A. Domínguez ; D. Dominis Prester ; D. Dorner ; M. Doro ; D. Elsaesser ; D. Ferenc ; M. V. Fonseca ; L. Font ; C. Fruck ; R. J. García López ; M. Garczarczyk ; D. Garrido ; G. Giavitto ; N. Godinović ; D. Hadasch ; D. Häfner ; A. Herrero ; D. Hildebrand ; D. Höhne-Mönch ; J. Hose ; D. Hrupec ; B. Huber ; T. Jogler ; H. Kellermann ; S. Klepser ; T. Krähenbühl ; J. Krause ; A. La Barbera ; D. Lelas ; E. Leonardo ; E. Lindfors ; S. Lombardi ; M. López ; A. López-Oramas ; E. Lorenz ; M. Makariev ; G. Maneva ; N. Mankuzhiyil ; K. Mannheim ; L. Maraschi ; M. Mariotti ; M. Martínez ; D. Mazin ; M. Meucci ; J. M. Miranda ; R. Mirzoyan ; H. Miyamoto ; J. Moldón ; A. Moralejo ; P. Munar-Adrover ; D. Nieto ; K. Nilsson ; R. Orito ; I. Oya ; D. Paneque ; R. Paoletti ; S. Pardo ; J. M. Paredes ; S. Partini ; M. Pasanen ; F. Pauss ; M. A. Perez-Torres ; M. Persic ; L. Peruzzo ; M. Pilia ; J. Pochon ; F. Prada ; P. G. Prada Moroni ; E. Prandini ; I. Puljak ; I. Reichardt ; R. Reinthal ; W. Rhode ; M. Ribó ; J. Rico ; S. Rügamer ; A. Saggion ; K. Saito ; T. Y. Saito ; M. Salvati ; K. Satalecka ; V. Scalzotto ; V. Scapin ; C. Schultz ; T. Schweizer ; M. Shayduk ; S. N. Shore ; A. Sillanpää ; J. Sitarek ; D. Sobczynska ; F. Spanier ; S. Spiro ; V. Stamatescu ; A. Stamerra ; B. Steinke ; J. Storz ; N. Strah ; T. Surić ; L. Takalo ; H. Takami ; F. Tavecchio ; P. Temnikov ; T. Terzić ; D. Tescaro ; M. Teshima ; O. Tibolla ; D. F. Torres ; A. Treves ; M. Uellenbeck ; H. Vankov ; P. Vogler ; R. M. Wagner ; Q. Weitzel ; V. Zabalza ; F. Zandanel ; R. Zanin ;
Date:	28 Nov 2011
Abstract:	We present very high energy (VHE, E > 100 GeV) {gamma}-ray observations of the {gamma}-ray binary system LS I+61 303 obtained with the MAGIC stereo system between 2009 October and 2010 January. We detect a 6.3{sigma} {gamma}-ray signal above 400 GeV in the combined data set. The integral flux above an energy of 300 GeV is F(E>300 GeV)=(1.4 +- 0.3stat +- 0.4syst) * 10^{-12} cm^{-2} s^{-1}, which corresponds to about 1.3% of the Crab Nebula flux in the same energy range. The orbit-averaged flux of LS I +61 303 in the orbital phase interval 0.6--0.7, where a maximum of the TeV flux is expected, is lower by almost an order of magnitude compared to our previous measurements between 2005 September and 2008 January. This provides evidence for a new low emission state in LS I +61 303. We find that the change to the low flux state cannot be solely explained by an increase of photon-photon absorption around the compact star.
Source:	arXiv, 1111.6572
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