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Pulsar wind zone processes in LS 5039

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dc.creator Sierpowska-Bartosik, Agnieszka
dc.creator Torres, Diego F.
dc.date 2008-06-29T14:26:19Z
dc.date 2008-06-29T14:26:19Z
dc.date 2008-10-10
dc.date.accessioned 2017-01-31T02:13:29Z
dc.date.available 2017-01-31T02:13:29Z
dc.identifier Astroparticle Physics 30(5): 239-263 (2008)
dc.identifier 0927-6505
dc.identifier http://hdl.handle.net/10261/5429
dc.identifier 10.1016/j.astropartphys.2008.09.009
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/5429
dc.description 25 pages, 31 figures.-- Printed version published Dec 2008.
dc.description Several γ-ray binaries have been recently detected by the high-energy stereoscopy array (HESS) and the major atmospheric imaging cerenkov (MAGIC) telescope. In at least two cases, their nature is unknown. In this paper we aim to provide the details of a theoretical model of close γ-ray binaries containing a young energetic pulsar as compact object, earlier presented in recent letters. This model includes a detailed account of the system geometry, the angular dependence of processes such as Klein–Nishina inverse Compton and γγ absorption in the anisotropic radiation field of the massive star, and a Monte Carlo simulation of leptonic cascading. We present and derive the used formulae and give all details about their numerical implementation, particularly, on the computation of cascades. In this model, emphasis is put in the processes occurring in the pulsar wind zone of the binary, since, as we show, opacities in this region can be already important for close systems. We provide a detailed study on all relevant opacities and geometrical dependencies along the orbit of binaries, exemplifying with the case of LS 5039. This is used to understand the formation of the very high-energy lightcurve and phase dependent spectrum. For the particular case of LS 5039, we uncover an interesting behavior of the magnitude representing the shock position in the direction to the observer along the orbit, and analyze its impact in the predictions. We show that in the case of LS 5039, the HESS phenomenology is matched by the presented model, and explore the reasons why this happens while discussing future ways of testing the model.
dc.description This work was supported by Spanish grants AYA 2006-00530 and CSIC-PIE 200750I029.
dc.description Peer reviewed
dc.format 1732286 bytes
dc.format application/pdf
dc.language eng
dc.publisher Elsevier
dc.relation http://dx.doi.org/10.1016/j.astropartphys.2008.09.009
dc.rights openAccess
dc.subject γ-rays: theory
dc.subject X-ray binaries (individual LS 5039)
dc.subject γ-rays: observations
dc.subject Pulsars
dc.subject High-Energy Stereoscopy Array (H.E.S.S.) Telescope
dc.subject Major Atmospheric Imaging Cerenkov (MAGIC) Telescope
dc.subject Theoretical model
dc.title Pulsar wind zone processes in LS 5039
dc.type Artículo

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