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Radiative striped wind model for gamma-ray bursts
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. AlbaNova, Oskar Klein Ctr Cosmoparticle Phys, Sweden.
2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 467, no 3, p. 2594-2611Article in journal (Refereed) Published
Abstract [en]

In this paper, we revisit the striped wind model in which the wind is accelerated by magnetic reconnection. In our treatment, radiation is included as an independent component, and two scenarios are considered. In the first one, radiation cannot stream efficiently through the reconnection layer, while the second scenario assumes that radiation is homogeneous in the striped wind. We show how these two assumptions affect the dynamics. In particular, we find that the asymptotic radial evolution of the Lorentz factor is not strongly modified whether radiation can stream through the reconnection layer or not. On the other hand, we show that the width, density and temperature of the reconnection layer are strongly dependent on these assumptions. We then apply the model to the gamma-ray burst context and find that photons cannot diffuse efficiently through the reconnection layer below radius r(D)(Delta) similar to 10(10.5) cm, which is about an order of magnitude below the photospheric radius. Above r(D)(Delta) , the dynamics asymptotes to the solution of the scenario in which radiation can stream through the reconnection layer. As a result, the density of the current sheet increases sharply, providing efficient photon production by the Bremsstrahlung process that could have profound influence on the emerging spectrum. This effect might provide a solution to the soft photon problem in gamma-ray bursts.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2017. Vol. 467, no 3, p. 2594-2611
Keyword [en]
diffusion, magnetic reconnection, radiative transfer, gamma-ray burst: general
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-206232DOI: 10.1093/mnras/stx237ISI: 000398419400009OAI: oai:DiVA.org:kth-206232DiVA, id: diva2:1096146
Note

QC 20170517

Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-05-17Bibliographically approved

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Begue, Dereli

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