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http://hdl.handle.net/2445/150577
Title: | 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 |
Author: | Bosch i Ramon, Valentí Munar i Adrover, Pere Moldón Vara, Francisco Javier Paredes i Poy, Josep Maria Ribó Gomis, Marc MAGIC Collaboration |
Keywords: | Astrofísica Raigs gamma Astrophysics Gamma rays |
Issue Date: | Feb-2012 |
Publisher: | Institute of Physics (IOP) |
Abstract: | We present very high energy (E > 100 GeV) γ-ray observations of the γ-ray binary system LS I +61°303 obtained with the MAGIC stereo system between 2009 October and 2010 January. We detect a 6.3σ γ-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-flux 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. |
Note: | Reproducció del document publicat a: http://doi.org/10.1088/0004-637X/746/1/80 |
It is part of: | Astrophysical Journal, 2012, vol. 746, p. 80 |
URI: | http://hdl.handle.net/2445/150577 |
Related resource: | http://doi.org/10.1088/0004-637X/746/1/80 |
ISSN: | 0004-637X |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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