A GENERALIZED MODEL OF NONLINEAR DIFFUSIVE SHOCK ACCELERATION COUPLED TO AN EVOLVING SUPERNOVA REMNANT

To better model the efficient production of cosmic rays (CRs) in supernova remnants (SNRs) with the associated coupling between CR production and SNR dynamics, we have generalized an existing cr-hydro-NEI code to include the following processes: (1) an explicit calculation of the upstream precursor...

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Bibliographic Details
Published in:The Astrophysical journal 2012-05, Vol.750 (2), p.1-13
Main Authors: Lee, Shiu-Hang, Ellison, Donald C, Nagataki, Shigehiro
Format: Article
Language:English
Subjects:
ACCELERATION
AMPLIFICATION
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COMPUTERIZED SIMULATION
COSMIC ELECTRONS
COUPLING
DENSITY
Diffusion
EMISSION SPECTRA
IONS
Joining
MAGNETIC FIELDS
Mathematical models
NONLINEAR PROBLEMS
Nonlinearity
PHOTON EMISSION
PLASMA
RELATIVISTIC RANGE
SHOCK WAVES
SPACE DEPENDENCE
SUPERNOVA REMNANTS
X RADIATION
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Summary:To better model the efficient production of cosmic rays (CRs) in supernova remnants (SNRs) with the associated coupling between CR production and SNR dynamics, we have generalized an existing cr-hydro-NEI code to include the following processes: (1) an explicit calculation of the upstream precursor structure including the position-dependent flow speed, density, temperature, and magnetic field strength; (2) a momentum- and space-dependent CR diffusion coefficient; (3) an explicit calculation of magnetic field amplification; (4) calculation of the maximum CR momentum using the amplified magnetic field; (5) a finite Alfven speed for the particle scattering centers; and (6) the ability to accelerate a superthermal seed population of CRs, as well as the ambient thermal plasma. While a great deal of work has been done modeling SNRs, most work has concentrated on either the continuum emission from relativistic electrons or ions or the thermal emission from the shock heated plasma. Our generalized code combines these elements and describes the interplay between CR production and SNR evolution, including the nonlinear coupling of efficient diffusive shock acceleration, based mainly on the work of R Blasi and coworkers, and a non-equilibrium ionization (NEI) calculation of thermal X-ray line emission. We believe that our generalized model will provide a consistent modeling platform for SNRs, including those interacting with molecular clouds, and improve the interpretation of current and future observations, including the high-quality spectra expected from Astro-H. SNR RX J 1713.7-3946 is modeled as an example.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/750/2/156