2026-06-27T23:19:07Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/438192024-09-05T16:52:20Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Antoranz Canales, Pedro
author
Barrio Uña, Juan Abel
author
Contreras González, José Luis
author
Fonseca González, María Victoria
author
Miranda Pantoja, José Miguel
author
Scapin, Valeria
2023-06-20T03:32:48Z
2023-06-20T03:32:48Z
2012-02-10
0004-637X
10.1088/0004-637X/746/1/80
https://hdl.handle.net/20.500.14352/43819
http://iopscience.iop.org/0004-637X/746/1/80
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.
eng
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
journal article
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https://docta.ucm.es/bitstreams/3e282a95-c676-4796-96bd-0cb191ad6814/download
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f121824e89af07d96458fa5d0a634109
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MirandaJM11.pdf
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fda3d0139cd1249662100d70884f8f53
36275
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MirandaJM11.pdf.txt