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

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...

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Autores: Bosch i Ramon, Valentí, Munar i Adrover, Pere, Moldón Vara, Francisco Javier, Paredes i Poy, Josep Maria, Ribó Gomis, Marc, MAGIC Collaboration
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/150577
Acceso en línea:https://hdl.handle.net/2445/150577
Access Level:acceso abierto
Palabra clave:Astrofísica
Raigs gamma
Astrophysics
Gamma rays
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spelling 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 2009Bosch i Ramon, ValentíMunar i Adrover, PereMoldón Vara, Francisco JavierParedes i Poy, Josep MariaRibó Gomis, MarcMAGIC CollaborationAstrofísicaRaigs gammaAstrophysicsGamma raysWe 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.Institute of Physics (IOP)2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/150577Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: http://doi.org/10.1088/0004-637X/746/1/80Astrophysical Journal, 2012, vol. 746, p. 80http://doi.org/10.1088/0004-637X/746/1/80(c) American Astronomical Society, 2012info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1505772026-05-27T06:46:51Z
dc.title.none.fl_str_mv 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
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
spellingShingle 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
Bosch i Ramon, Valentí
Astrofísica
Raigs gamma
Astrophysics
Gamma rays
title_short 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
title_full 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
title_fullStr 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
title_full_unstemmed 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
title_sort 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
dc.creator.none.fl_str_mv Bosch i Ramon, Valentí
Munar i Adrover, Pere
Moldón Vara, Francisco Javier
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
MAGIC Collaboration
author Bosch i Ramon, Valentí
author_facet Bosch i Ramon, Valentí
Munar i Adrover, Pere
Moldón Vara, Francisco Javier
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
MAGIC Collaboration
author_role author
author2 Munar i Adrover, Pere
Moldón Vara, Francisco Javier
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
MAGIC Collaboration
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Astrofísica
Raigs gamma
Astrophysics
Gamma rays
topic Astrofísica
Raigs gamma
Astrophysics
Gamma rays
description 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.
publishDate 2012
dc.date.none.fl_str_mv 2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/150577
url https://hdl.handle.net/2445/150577
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: http://doi.org/10.1088/0004-637X/746/1/80
Astrophysical Journal, 2012, vol. 746, p. 80
http://doi.org/10.1088/0004-637X/746/1/80
dc.rights.none.fl_str_mv (c) American Astronomical Society, 2012
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Astronomical Society, 2012
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Institute of Physics (IOP)
publisher.none.fl_str_mv Institute of Physics (IOP)
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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