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GLAST testing of a pulsar model matching H.E.S.S. observations of LS 5039

AuthorsSierpowska-Bartosik, Agnieszka ; Torres, Diego F.
KeywordsX-ray binaries (individual LS 5039)
γ-rays: observations
γ-rays: theory
High-Energy Stereoscopy Array (H.E.S.S.) Telescope
Issue Date22-Jan-2008
PublisherAmerican Astronomical Society
University of Chicago Press
CitationThe Astrophysical Journal Letters 674(2): L89-L92 (2008)
AbstractLS 5039 is one of a handful of X-ray binaries that have been recently detected at high-energy γ-rays, in this case, by the High Energy Stereoscopic System (H.E.S.S.). The nature of this system is unknown: both a black hole and a pulsar have been invoked as possible compact object companions. Here we work with a model of the high-energy phenomenology of the system in which it is assumed that the companion object is a pulsar rotating around an O6.5 V star in a ~3.9 day orbit. The model assumes two different sets of power-law spectral parameters of the interacting primary leptons corresponding to the two orbital phase intervals defined by H.E.S.S. as having different γ-ray spectra and very high energy (VHE) cutoffs. We show that the H.E.S.S. phenomenology is completely explained by this model. We present predictions for photons with lower energies (for E > 1 GeV), subject to test in the forthcoming months with the GLAST satellite. We find that GLAST will be able to judge on this model within 1 year.
Description4 pages.-- Printed version published on Feb 20, 2008.
Publisher version (URL)http://dx.doi.org/10.1086/529376
Appears in Collections:(ICE) Artículos
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