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dc.contributor.authorAbdo, A.A.en_US
dc.contributor.authorVenter, C.
dc.contributor.authorAckermann, M.
dc.contributor.authorAjello, M.
dc.contributor.authorAtwood, W.B.
dc.contributor.authorFermi LAT
dc.date.accessioned2010-08-04T15:37:34Z
dc.date.available2010-08-04T15:37:34Z
dc.date.issued2009en_US
dc.identifier.citationAbdo, A.A. et al. 2009. Ferm/LAT obeservations of LS 5039. Astrophysical journal letters, 706(1):L56-L61. [https://doi.org/10.1088/0004-637X/706/1/L56]en_US
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/3488
dc.identifier.urihttps://doi.org/10.1088/0004-637X/706/1/L56
dc.identifier.urihttps://iopscience.iop.org/article/10.1088/0004-637X/706/1/L56/pdf
dc.description.abstractThe first results from observations of the high-mass X-ray binary LS 5039 using the Fermi Gamma-ray Space Telescope data between 2008 August and 2009 June are presented. Our results indicate variability that is consistent with the binary period, with the emission being modulated with a period of 3.903 ± 0.005 days; the first detection of this modulation at GeV energies. The light curve is characterized by a broad peak around superior conjunction in agreement with inverse Compton scattering models. The spectrum is represented by a power law with an exponential cutoff, yielding an overall flux (100 MeV-300 GeV) of 4.9 ± 0.5(stat) ± 1.8(syst) ×10–7 photon cm–2 s–1, with a cutoff at 2.1 ± 0.3(stat) ± 1.1(syst) GeV and photon index Γ = 1.9 ± 0.1(stat) ± 0.3(syst). The spectrum is observed to vary with orbital phase, specifically between inferior and superior conjunction. We suggest that the presence of a cutoff in the spectrum may be indicative of magnetospheric emission similar to the emission seen in many pulsars by Fermi
dc.language.isoen
dc.publisherIOP Publishing
dc.subjectBinaries: close
dc.subjectGamma rays: observations
dc.subjectStars: variables: other
dc.subjectX-rays: binaries
dc.subjectX-rays: individual (LS 5039)
dc.titleFermi/LAT obeservations of LS 5039en_US
dc.contributor.researchID12006653 - Venter, Christo


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