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dc.contributor.author
Pittard, J. M
dc.contributor.author
Romero, G. E.
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Vila, Gabriela Soledad
dc.date.available
2022-08-16T12:18:20Z
dc.date.issued
2021-07
dc.identifier.citation
Pittard, J. M; Romero, G. E.; Vila, Gabriela Soledad; Particle acceleration and non-Thermal emission in colliding-wind binary systems; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 504; 3; 7-2021; 4204-4225
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/165554
dc.description.abstract
We present a model for the creation of non-Thermal particles via diffusive shock acceleration in a colliding-wind binary. Our model accounts for the oblique nature of the global shocks bounding the wind-wind collision region and the finite velocity of the scattering centres to the gas. It also includes magnetic field amplification by the cosmic ray induced streaming instability and the dynamical back reaction of the amplified field. We assume that the injection of the ions and electrons is independent of the shock obliquity and that the scattering centres move relative to the fluid at the Alfvén velocity (resulting in steeper non-Thermal particle distributions). We find that the Mach number, Alfvénic Mach number, and transverse field strength vary strongly along and between the shocks, resulting in significant and non-linear variations in the particle acceleration efficiency and shock nature (turbulent versus non-Turbulent). We find much reduced compression ratios at the oblique shocks in most of our models compared to our earlier work, though total gas compression ratios that exceed 20 can still be obtained in certain situations. We also investigate the dependence of the non-Thermal emission on the stellar separation and determine when emission from secondary electrons becomes important. We finish by applying our model to WR 146, one of the brightest colliding wind binaries in the radio band. We are able to match the observed radio emission and find that roughly 30 per cent of the wind power at the shocks is channelled into non-Thermal particles.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
BINARIES: GENERAL
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GAMMA-RAYS: STARS
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RADIATION MECHANISMS: NON-THERMAL
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STARS: EARLY-TYPE
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STARS: WINDS, OUTFLOWS
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STARS: WOLF-RAYET
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Particle acceleration and non-Thermal emission in colliding-wind binary systems
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-08-16T12:06:42Z
dc.journal.volume
504
dc.journal.number
3
dc.journal.pagination
4204-4225
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Pittard, J. M. University of Leeds; Reino Unido
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Fil: Romero, G. 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
dc.description.fil
Fil: Vila, Gabriela Soledad. 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
dc.journal.title
Monthly Notices of the Royal Astronomical Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stab1107
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