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Application of cosmic-ray shock theories to the Cygnus Loop - An alternative model

Boulares, Ahmed ; Cox, Donald P.

The Astrophysical journal, 1988-10, Vol.333 (1), p.198-218 [Periódico revisado por pares]

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Título:
Application of cosmic-ray shock theories to the Cygnus Loop - An alternative model
Autor: Boulares, Ahmed ; Cox, Donald P.
Assuntos: Astronomy ; Astrophysics ; Earth, ocean, space ; Exact sciences and technology ; Interstellar medium (ism) and nebulae in milky way ; Stellar systems. Galactic and extragalactic objects and systems. The universe ; Supernova remnants
É parte de: The Astrophysical journal, 1988-10, Vol.333 (1), p.198-218
Notas: CDMS
Legacy CDMS
Descrição: Steady state cosmic-ray shock models are investigated here in the light of observations of the Cygnus Loop supernova remnant. The predicted downstream temperature is derived for each model. The Cygnus Loop data and the application of the models to them, including wave dissipation, are presented. Heating rate and ionization fraction structures are provided along with an estimate of the cosmic-ray diffusion coefficient. It is found that the model of Voelk, Drury, and McKenzie (1984), in which the plasma waves are generated by the streaming instability of the cosmic rays and are dissipated into the gas, can be made consistent with some observed characteristics of the Cygnus Loop shocks. The model is used to deduce upstream densities and shock velocities and, compared to the usual pure gas shock interpretation, it is found that lower densities and approximately three times higher velocities are required.
Editor: Legacy CDMS: University of Chicago Press
Idioma: Inglês

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