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Periodic very high energy gamma-ray emission from LS I+61 degrees 303 observed with the MAGIC Telescope

dc.contributor.authorAntoranz Canales, Pedro
dc.contributor.authorBarrio Uña, Juan Abel
dc.contributor.authorContreras González, José Luis
dc.contributor.authorFonseca González, María Victoria
dc.contributor.authorMiranda Pantoja, José Miguel
dc.contributor.authorNieto Castaño, Daniel
dc.date.accessioned2023-06-20T03:35:08Z
dc.date.available2023-06-20T03:35:08Z
dc.date.issued2009-03-01
dc.description© The American Astronomical Society. We thank the IAC for the excellent working conditions at the ORM. The support of the German BMBF, MPG, and the YIP of the Helmholtz Gemeinschaft, the Italian INFN, the Spanish MEC, the ETH Research Grant TH 34/04 3 and the Polish MNiI Grant 1P03D01028 is gratefully acknowledged.
dc.description.abstractThe MAGIC collaboration has recently reported the discovery of gamma-ray emission from the binary system LS I +61 degrees 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 degrees 303. In addition, we also obtained a differential energy spectrum for two orbital phase bins covering the phase range 0.5 < phi < 0.6 and 0.6 < phi < 0.7. The photon index in the two phase bins is consistent within the errors with an average index Gamma = 2.6 +/- 0.2(stat) +/- 0.2(sys). LS I +61 degrees 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 degrees 303 data taken in 2005 and 2006. We found the LS I +61 degrees 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.
dc.description.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipGerman BMBF
dc.description.sponsorshipMPG
dc.description.sponsorshipYIP of the Helmholtz Gemeinschaft
dc.description.sponsorshipItalian INFN
dc.description.sponsorshipSpanish MEC
dc.description.sponsorshipETH Research Grant
dc.description.sponsorshipPolish MNiI
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/22741
dc.identifier.doi10.1088/0004-637X/693/1/303
dc.identifier.issn0004-637X
dc.identifier.officialurlhttp://dx.doi.org/10.1088/0004-637X/693/1/303
dc.identifier.relatedurlhttp://iopscience.iop.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/43960
dc.issue.number1
dc.journal.titleAstrophysical journal
dc.language.isoeng
dc.page.final310
dc.page.initial303
dc.publisherIOP Publishing
dc.relation.projectIDTH 34/04 3
dc.relation.projectID1P03D01028
dc.rights.accessRightsopen access
dc.subject.cdu537
dc.subject.cdu539.1
dc.subject.keywordSource 2CG 135+01
dc.subject.keywordX-Ray
dc.subject.keywordH-Alpha
dc.subject.keywordMicroquasar LS-I+61-303
dc.subject.keywordSpaced Data
dc.subject.keywordLSI+61-Degrees-303
dc.subject.keywordBinary
dc.subject.keywordRadio
dc.subject.keywordLS-I-+61-303.
dc.subject.ucmElectrónica (Física)
dc.subject.ucmElectricidad
dc.subject.ucmFísica nuclear
dc.subject.unesco2202.03 Electricidad
dc.subject.unesco2207 Física Atómica y Nuclear
dc.titlePeriodic very high energy gamma-ray emission from LS I+61 degrees 303 observed with the MAGIC Telescope
dc.typejournal article
dc.volume.number693
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