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26 April 2024

» arxiv » 1203.2867

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Detection of VHE gamma-rays from HESS J0632+057 during the 2011 February X-ray outburst with the MAGIC Telescopes
MAGIC Collaboration ; J. Aleksić ; E. A. Alvarez ; L. A. Antonelli ; P. Antoranz ; M. Asensio ; M. Backes ; U. Barres de Almeida ; J. A. Barrio ; D. Bastieri ; J. Becerra González ; W. Bednarek ; K. Berger ; E. Bernardini ; A. Biland ; O. Blanch ; R. K. Bock ; A. Boller ; G. Bonnoli ; D. Borla Tridon ; V. Bosch-Ramon ; T. Bretz ; A. Cañellas ; E. Carmona ; A. Carosi ; P. Colin ; E. Colombo ; J. L. Contreras ; J. Cortina ; L. Cossio ; S. Covino ; P. Da Vela ; 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. Eisenacher ; D. Elsaesser ; D. Ferenc ; M. V. Fonseca ; L. Font ; C. Fruck ; R. J. García López ; M. Garczarczyk ; D. Garrido Terrats ; G. Giavitto ; N. Godinović ; A. González Muñoz ; S. R. Gozzini ; D. Hadasch ; D. Häfner ; A. Herrero ; D. Hildebrand ; J. Hose ; D. Hrupec ; B. Huber ; F. Jankowski ; T. Jogler ; V. Kadenius ; H. Kellermann ; S. Klepser ; T. Krähenbühl ; J. Krause ; A. La Barbera ; D. Lelas ; E. Leonardo ; N. Lewandowska ; E. Lindfors ; S. Lombardi ; M. López ; R. López-Coto ; 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 ; J. Moldón ; A. Moralejo ; P. Munar-Adrover ; A. Niedzwiecki ; D. Nieto ; K. Nilsson ; N. Nowak ; R. Orito ; S. Paiano ; D. Paneque ; R. Paoletti ; S. Pardo ; J. M. Paredes ; S. Partini ; M. A. Perez-Torres ; M. Persic ; M. Pilia ; J. Pochon ; F. Prada ; P. G. Prada Moroni ; E. Prandini ; I. Puerto Gimenez ; 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 ; S. N. Shore ; A. Sillanpää ; J. Sitarek ; I. Snidaric ; D. Sobczynska ; F. Spanier ; S. Spiro ; V. Stamatescu ; A. Stamerra ; B. Steinke ; J. Storz ; N. Strah ; S. Sun ; 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 ; P. Vogler ; R. M. Wagner ; Q. Weitzel ; V. Zabalza ; F. Zandanel ; R. Zanin ; now at ; Ecole polytechnique fédérale de Lausanne ; Lausanne ; Switzerland ; supported by INFN Padova ; now at ; Centro de Investigaciones Energéticas ; Medioambientales y Tecnológicas ; Madrid ; Spain ; now at ; KIPAC ; SLAC National Accelerator Laboratory ; now at ; Finnish Centre for Astronomy with ESO ; University of Turku ; Finland) ;
Date:	13 Mar 2012
Abstract:	The very high energy (VHE) gamma-ray source HESS J0632+057 has recently been confirmed to be a gamma-ray binary. The optical counterpart is the Be star MWC 148, and a compact object of unknown nature orbits it every ~321 d with a high eccentricity of ~0.8. We monitored HESS J0632+057 with the stereoscopic MAGIC telescopes from 2010 October to 2011 March and detected significant VHE gamma-ray emission during 2011 February, when the system exhibited an X-ray outburst. We find no gamma-ray signal in the other observation periods when the system did not show increased X-ray flux. Thus HESS J0632+057 exhibits gamma-ray variability on timescales of the order of one to two months possibly linked to the X-ray outburst that takes place about 100 days after the periastron passage. Furthermore our measurements provide for the first time the gamma-ray spectrum down to about 140 GeV and indicate no turnover of the spectrum at low energies. We compare the properties of HESS J0632+057 with the similar gamma-ray binary LS I +61 303, and discuss on the possible origin of the multi-wavelength emission of the source
Source:	arXiv, 1203.2867
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