Accretion vs. colliding wind models for the gamma-ray binary LS I +61 303: an assessment

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Fil: Romero, Gustavo E. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argen...

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Autores principales: Romero, Gustavo E., Okazaki, A., Orellana, Mariana Dominga, Owocki, S.
Lenguaje:Español
Publicado: 2007
Materias:
Ciencias Exactas y Naturales
X-rays
binaries
gamma rays
theory
stars
individual
LS I+61 303
Acceso en línea:http://dx.doi.org/10.1051/0004-6361:20078035
http://hdl.handle.net/11336/29336
https://rid.unrn.edu.ar/jspui/handle/20.500.12049/2822
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Repositorio Institucional Digital de la Universidad Nacional de Río Negro (UNRN) de Universidad Nacional de Río Negro
id I65-R171-20.500.12049-2822
record_format dspace
spelling I65-R171-20.500.12049-28222023-09-13T15:28:27Z application/pdf info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/4.0/ 2007-08-07 Fil: Romero, Gustavo E. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina Fil: Okazaki, A. Hokkai-Gaukuen University; Japón Fil: Orellana, Mariana D. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina Fil: Owocki, S. University of Delaware; Estados Unidos Accretion vs. colliding wind models for the gamma-ray binary LS I +61 303: an assessment Romero, Gustavo E. Okazaki, A. Orellana, Mariana Dominga Owocki, S. Ciencias Exactas y Naturales X-rays binaries gamma rays theory stars individual LS I+61 303 Ciencias Exactas y Naturales true Context. LS I +61 303 is a puzzling Be/X ray binary with variable gamma ray emission up to TeV energies. The nature of the compact object and the origin of the highenergy emission are unclear. One family of models invokes particle acceleration in shocks from the collision between the B star wind and a relativistic pulsar wind, whereas another centers on a relativistic jet powered by accretion from the Be star decretion disc onto a black hole. Recent high resolution radio observations showing a putative “cometary tail” pointing away from the Be star near periastron have been cited as support for the pulsar wind model. Aims. We wish to carry out a quantitative assessment of these competing models. Methods. We apply a “Smoothed Particle Hydrodynamics” (SPH) code in 3D dynamical simulations for both the pulsar windinteraction and accretion jet models. The former yields a dynamical description of the shape of the wind wind interaction surface. The latter provides a dynamical estimation of the accretion rate under a variety of conditions, and how this varies with orbital phase. Results. The results allow critical evaluation of how the two distinct models confront the data in various wavebands. When one accounts for the 3D dynamical wind interaction under realistic constraints for the relative strength of the B star and pulsar winds, the resulting form of the interaction front does not match the putative “cometary tail” claimed from radio observations. On the other hand, dynamical simulations of the accretion jet model indicate that the orbital phase variation of accretion power includes a secondary broad peak well away from periastron, thus providing a plausible way to explain the observed TeV gamma ray emission toward apastron. Conclusions. Contrary to previous claims, the colliding wind model is not clearly established for LS I +61 303, whereas the accretionjet model can reproduce many key characteristics, such as required energy budget, lightcurve, and spectrum of the observed TeV gamma ray emission. Romero, Gustavo E., Okazaki, A., Orellana, Mariana D. & Owocki, S. (2007). Accretion vs. colliding wind models for the gamma-ray binary LS I +61 303: an assessment. EDP Sciences; Astronomy and Astrophysics; 474; 1; 15-22 0004-6361 http://dx.doi.org/10.1051/0004-6361:20078035 http://hdl.handle.net/11336/29336 https://rid.unrn.edu.ar/jspui/handle/20.500.12049/2822 es 474 Astronomy and Astrophysics
institution Universidad Nacional de Río Negro
institution_str I-65
repository_str R-171
collection Repositorio Institucional Digital de la Universidad Nacional de Río Negro (UNRN)
language Español
orig_language_str_mv es
topic Ciencias Exactas y Naturales
X-rays
binaries
gamma rays
theory
stars
individual
LS I+61 303
Ciencias Exactas y Naturales
spellingShingle Ciencias Exactas y Naturales
X-rays
binaries
gamma rays
theory
stars
individual
LS I+61 303
Ciencias Exactas y Naturales
Romero, Gustavo E.
Okazaki, A.
Orellana, Mariana Dominga
Owocki, S.
Accretion vs. colliding wind models for the gamma-ray binary LS I +61 303: an assessment
topic_facet Ciencias Exactas y Naturales
X-rays
binaries
gamma rays
theory
stars
individual
LS I+61 303
Ciencias Exactas y Naturales
description Fil: Romero, Gustavo E. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
author Romero, Gustavo E.
Okazaki, A.
Orellana, Mariana Dominga
Owocki, S.
author_facet Romero, Gustavo E.
Okazaki, A.
Orellana, Mariana Dominga
Owocki, S.
author_sort Romero, Gustavo E.
title Accretion vs. colliding wind models for the gamma-ray binary LS I +61 303: an assessment
title_short Accretion vs. colliding wind models for the gamma-ray binary LS I +61 303: an assessment
title_full Accretion vs. colliding wind models for the gamma-ray binary LS I +61 303: an assessment
title_fullStr Accretion vs. colliding wind models for the gamma-ray binary LS I +61 303: an assessment
title_full_unstemmed Accretion vs. colliding wind models for the gamma-ray binary LS I +61 303: an assessment
title_sort accretion vs. colliding wind models for the gamma-ray binary ls i +61 303: an assessment
publishDate 2007
url http://dx.doi.org/10.1051/0004-6361:20078035
http://hdl.handle.net/11336/29336
https://rid.unrn.edu.ar/jspui/handle/20.500.12049/2822
work_keys_str_mv AT romerogustavoe accretionvscollidingwindmodelsforthegammaraybinarylsi61303anassessment
AT okazakia accretionvscollidingwindmodelsforthegammaraybinarylsi61303anassessment
AT orellanamarianadominga accretionvscollidingwindmodelsforthegammaraybinarylsi61303anassessment
AT owockis accretionvscollidingwindmodelsforthegammaraybinarylsi61303anassessment
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