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25 April 2024

» arxiv » 1103.5677

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A search for Very High Energy gamma-ray emission from Sco X-1 with the MAGIC telescopes
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 ; P. Bordas ; 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 ; 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 ; S. Klepser ; T. Krähenbühl ; J. Krause ; A. La Barbera ; D. Lelas ; E. Leonardo ; E. Lindfors ; S. Lombardi ; M. López ; 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 ; A. Stamerra ; B. Steinke ; J. Storz ; N. Strah ; T. Surić ; L. Takalo ; H. Takami ; F. Tavecchio ; P. Temnikov ; T. Terzić ; D. Tescaro ; M. Teshima ; M. Thom ; O. Tibolla ; D. F. Torres ; A. Treves ; H. Vankov ; P. Vogler ; R. M. Wagner ; Q. Weitzel ; V. Zabalza ; F. Zandanel ; R. Zanin ;
Date:	29 Mar 2011
Abstract:	The acceleration of particles up to GeV or higher energies in microquasars has been the subject of considerable theoretical and observational efforts in the past few years. Sco X-1 is a microquasar from which evidence of highly energetic particles in the jet has been found when it is in the so-called Horizontal Branch, a state when accretion is lower and a powerful relativistic jet is present. Here we present the first very high energy gamma-ray observations of Sco X-1 obtained with the MAGIC telescopes. An analysis of the whole dataset does not yield a significant signal, with 95% CL flux upper limits above 300 GeV at the level of 2.4x10^{-12} ph/cm^2/s. Simultaneous RXTE observations were conducted to search for TeV emission during particular X-ray states of the source. A selection of the gamma-ray data obtained during the Horizontal Branch based on the X-ray colors did not yield a signal either, with an upper limit of 3.4x10^{-12} ph/cm^2/s. These upper limits place a constraint on the maximum TeV luminosity to non-thermal X-ray luminosity of L_{VHE}/L_{ntX}<0.02, that can be related to a maximum TeV luminosity to jet power ratio of L_{VHE}/L_{j}<10^{-3}. Our upper limits indicate that the underlying high-energy emission physics in Sco X-1 must be inherently different to that of the hitherto detected gamma-ray binaries.
Source:	arXiv, 1103.5677
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