Detection of the γ-Ray Binary LS I +61°303 in a Low-flux State at Very High Energy γ-Rays with the MAGIC Telescopes in 2009

J Aleksic,E A Alvarez,L Antonelli,P Antoranz,M Asensio,Moritz Backes,J A Barrio,D Bastieri,J Becerra Gonzalez,W Bednarek, A Berdyugin,K Berger,E Bernardini, A Biland,O Blanch,R Bock,A Boller,G Bonnoli,D Borla Tridon,V Boschramon,I Braun,T Bretz,A Canellas,E Carmona,A Carosi,Pierre Colin,E Colombo,J L Contreras,J Cortina,L Cossio,Stefano 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 Dominguez,D Dominis Prester,D Dorner,M Doro,D Elsaesser, D Ferenc,M V Fonseca, L Font,C Fruck,R J Garcia Lopez, M Garczarczyk,D Garrido,G Giavitto, N Godinovic,D Hadasch,D Hafner,A Herrero,D Hildebrand, D Hohnemonch,J Hose,D Hrupec,B Huber,T Jogler,H Kellermann,S Klepser, T Krahenbuhl,J Krause,A La Barbera,D Lelas,E Leonardo,E Lindfors,S Lombardi,A Lopez,M Lopez,E Lorenz,M Makariev,G Maneva,N Mankuzhiyil,K Mannheim,L Maraschi,M Mariotti,M Martinez,D Mazin,M Meucci, J M Miranda,R Mirzoyan,H Miyamoto,J Moldon,A Moralejo,P Munaradrover,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 Pereztorres,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 Ribo,J Rico, S Rugamer,A Saggion,Koji Saito,T Saito,M Salvati,K Satalecka,V Scalzotto,V Scapin,C Schultz,T Schweizer,M Shayduk,Steven N Shore, A Sillanpaa,J Sitarek,D Sobczynska,F Spanier,S Spiro,A Stamerra,B Steinke,Jay F Storz,N Strah,T Suric,Leo O Takalo,Hideki Takami,F Tavecchio,P Temnikov,T Terzic,D Tescaro,Masahiro Teshima,O Tibolla,D F Torres,Aldo Treves,M Uellenbeck,H Vankov,P Vogler,R M Wagner,Q Weitzel,V Zabalza,F Zandanel,R Zanin

ASTROPHYSICAL JOURNAL（2012）

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摘要

We present very high energy (E > 100 GeV) gamma-ray observations of the gamma-ray binary system LS I +61 degrees 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 +/- 0.3(stat) +/- 0.4(syst)) x 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 degrees 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-flux state in LS I +61 degrees 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.

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关键词

binaries: general,gamma rays: general,stars: individual (LS I+61 degrees 303),X-rays: binaries,X-rays: individual (LS I+61 degrees 303)

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