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Título:
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Detection of the gamma-ray binary LS I+61 degrees 303 in a low-flux state at very high energy gamma-rays with the magic telescopes in 2009
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Autores:
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Antoranz Canales, Pedro ;
Barrio Uña, Juan Abel ;
Contreras González, José Luis ;
Fonseca González, Mª Victoria ;
Miranda Pantoja, José Miguel ;
Scapin, Valeria
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Tipo de documento:
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texto impreso
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Editorial:
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IOP Publishing, 2012-02-10
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Electrónica
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Materia = Ciencias: Física: Electricidad
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Materia = Ciencias: Física: Física nuclear
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Tipo = Artículo
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Resumen:
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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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En línea:
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https://eprints.ucm.es/id/eprint/21369/1/MirandaJM11.pdf
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