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2006MNRAS.372..801P - Mon. Not. R. Astron. Soc., 372, 801-826 (2006/October-3)
Radio, X-ray, and γ-ray emission models of the colliding-wind binary WR140.
PITTARD J.M. and DOUGHERTY S.M.
Abstract (from CDS):
We show that the turnover at ∼3 GHz in the radio emission is due to free-free absorption, since models based on the Razin effect have an unacceptably large fraction of energy in non-thermal electrons. We find that the spectral index of the non-thermal electron energy distribution is flatter than the canonical value for diffusive shock acceleration, namely p < 2. Several mechanisms are discussed that could lead to such an index. Our inability to obtain fits to the radio data with p > 2 does not exclude the possibility of shock modification, but stronger evidence than that which currently exists is necessary for its support.
Tighter constraints on p and the nature of the shocks in WR140 will be obtained from future observations at MeV and GeV energies, for which we generally predict lower fluxes than those in previous works. Since the high stellar photon fluxes prevent the acceleration of electrons beyond γ ≳ 105-106, TeV emission from colliding-wind binary systems will provide unambiguous evidence of pion-decay emission from accelerated ions. We finish by commenting on the emission and physics of the multiple wind collisions in dense stellar clusters, paying particular attention to the Galactic Centre.
Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s): binaries: general - stars: early-type - stars: individual: WR 140 - stars: Wolf - Rayet - radio continuum: stars - X-rays: stars
Simbad objects: 20
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