Pittard, JM orcid.org/0000-0003-2244-5070, Vila, GS and Romero, GE orcid.org/0000-0002-5260-1807 (2020) Colliding-wind binary systems: Diffusive shock acceleration and non-thermal emission. Monthly Notices of the Royal Astronomical Society. ISSN 0035-8711
Abstract
We present a model for the non-thermal emission from a colliding-wind binary. Relativistic protons and electrons are assumed to be accelerated through diffusive shock acceleration (DSA) at the global shocks bounding the wind-wind collision region. The non-linear effects of the back-reaction due to the cosmic ray pressure on the particle acceleration process and the cooling of the non-thermal particles as they flow downstream from the shocks are included. We explore how the non-thermal particle distribution and the keV−GeV emission changes with the stellar separation and the viewing angle of the system, and with the momentum ratio of the winds. We confirm earlier findings that DSA is very efficient when magnetic field amplification is not included, leading to significantly modified shocks. We also find that the non-thermal flux scales with the binary separation in a complicated way and that the anisotropic inverse Compton emission shows only a moderate variation with viewing angle due to the spatial extent of the wind-wind collision.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. This is an author produced version of a journal article published in Monthly Notices of the Royal Astronomical Society. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | binaries: general, gamma-rays: stars, radiation mechanisms: non-thermal, stars: early-type, stars: winds, outflows, stars: Wolf-Rayet |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 May 2020 10:05 |
Last Modified: | 19 Dec 2024 15:53 |
Status: | Published online |
Publisher: | Oxford University Press (OUP) |
Identification Number: | 10.1093/mnras/staa1099 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:160181 |