Periodic very high energy γ -Ray Emission from LS I +61◦303 Observed with the magic telescope

The MAGIC collaboration has recently reported the discovery of γ -ray emission from the binary system LS I +61◦303 in the TeV energy region. Here we present new observational results on this source in the energy range between 300 GeV and 3 TeV. In total, 112 hr of data were taken between 2006 Septem...

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Detalles Bibliográficos
Autores: Domínguez, A., Moles, Mariano, Pérez-Torres, Miguel A., Prada, Francisco, Sánchez-Conde, Miguel A.
Tipo de recurso: artículo
Fecha de publicación:2009
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/24472
Acceso en línea:http://hdl.handle.net/10261/24472
Access Level:acceso abierto
Palabra clave:Gamma rays: observations
Stars: individual (LS I +61◦303)
X-ray binaries
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spelling Periodic very high energy γ -Ray Emission from LS I +61◦303 Observed with the magic telescopeDomínguez, A.Moles, MarianoPérez-Torres, Miguel A.Prada, FranciscoSánchez-Conde, Miguel A.Gamma rays: observationsStars: individual (LS I +61◦303)X-ray binariesThe MAGIC collaboration has recently reported the discovery of γ -ray emission from the binary system LS I +61◦303 in the TeV energy region. Here we present new observational results on this source in the energy range between 300 GeV and 3 TeV. In total, 112 hr of data were taken between 2006 September and December covering four orbital cycles of this object. This large amount of data allowed us to produce an integral flux light curve covering for the first time all orbital phases of LS I +61◦303. In addition, we also obtained a differential energy spectrum for two orbital phase bins covering the phase range 0.5 < φ < 0.6 and 0.6 < φ < 0.7. The photon index in the two phase bins is consistent within the errors with an average index Γ = 2.6±0.2stat ±0.2sys. LS I +61◦303 was found to be variable at TeV energies on timescales of days. These new MAGIC measurements allowed us to search for intranight variability of the very high energy emission; however, no evidence for flux variability on timescales down to 30 min was found. To test for possible periodic structures in the light curve, we apply the formalism developed by Lomb and Scargle to the LS I +61◦303 data taken in 2005 and 2006. We found the LS I +61◦303 data set to be periodic with a period of (26.8 ± 0.2) days (with a post-trial chance probability of 10−7), close to the orbital period.Peer reviewedAmerican Astronomical Society201020102009info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501325960 bytes325960 bytesapplication/pdfapplication/pdfhttp://hdl.handle.net/10261/24472reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1088/0004-637X/693/1/303info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/244722026-05-22T06:33:51Z
dc.title.none.fl_str_mv Periodic very high energy γ -Ray Emission from LS I +61◦303 Observed with the magic telescope
title Periodic very high energy γ -Ray Emission from LS I +61◦303 Observed with the magic telescope
spellingShingle Periodic very high energy γ -Ray Emission from LS I +61◦303 Observed with the magic telescope
Domínguez, A.
Gamma rays: observations
Stars: individual (LS I +61◦303)
X-ray binaries
title_short Periodic very high energy γ -Ray Emission from LS I +61◦303 Observed with the magic telescope
title_full Periodic very high energy γ -Ray Emission from LS I +61◦303 Observed with the magic telescope
title_fullStr Periodic very high energy γ -Ray Emission from LS I +61◦303 Observed with the magic telescope
title_full_unstemmed Periodic very high energy γ -Ray Emission from LS I +61◦303 Observed with the magic telescope
title_sort Periodic very high energy γ -Ray Emission from LS I +61◦303 Observed with the magic telescope
dc.creator.none.fl_str_mv Domínguez, A.
Moles, Mariano
Pérez-Torres, Miguel A.
Prada, Francisco
Sánchez-Conde, Miguel A.
author Domínguez, A.
author_facet Domínguez, A.
Moles, Mariano
Pérez-Torres, Miguel A.
Prada, Francisco
Sánchez-Conde, Miguel A.
author_role author
author2 Moles, Mariano
Pérez-Torres, Miguel A.
Prada, Francisco
Sánchez-Conde, Miguel A.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Gamma rays: observations
Stars: individual (LS I +61◦303)
X-ray binaries
topic Gamma rays: observations
Stars: individual (LS I +61◦303)
X-ray binaries
description The MAGIC collaboration has recently reported the discovery of γ -ray emission from the binary system LS I +61◦303 in the TeV energy region. Here we present new observational results on this source in the energy range between 300 GeV and 3 TeV. In total, 112 hr of data were taken between 2006 September and December covering four orbital cycles of this object. This large amount of data allowed us to produce an integral flux light curve covering for the first time all orbital phases of LS I +61◦303. In addition, we also obtained a differential energy spectrum for two orbital phase bins covering the phase range 0.5 < φ < 0.6 and 0.6 < φ < 0.7. The photon index in the two phase bins is consistent within the errors with an average index Γ = 2.6±0.2stat ±0.2sys. LS I +61◦303 was found to be variable at TeV energies on timescales of days. These new MAGIC measurements allowed us to search for intranight variability of the very high energy emission; however, no evidence for flux variability on timescales down to 30 min was found. To test for possible periodic structures in the light curve, we apply the formalism developed by Lomb and Scargle to the LS I +61◦303 data taken in 2005 and 2006. We found the LS I +61◦303 data set to be periodic with a period of (26.8 ± 0.2) days (with a post-trial chance probability of 10−7), close to the orbital period.
publishDate 2009
dc.date.none.fl_str_mv 2009
2010
2010
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/24472
url http://hdl.handle.net/10261/24472
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1088/0004-637X/693/1/303
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 325960 bytes
325960 bytes
application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Astronomical Society
publisher.none.fl_str_mv American Astronomical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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