HIGH-ENERGY COSMIC-RAY DIFFUSION IN MOLECULAR CLOUDS: A NUMERICAL APPROACH

@article{Fatuzzo2010HIGHENERGYCD,
  title={HIGH-ENERGY COSMIC-RAY DIFFUSION IN MOLECULAR CLOUDS: A NUMERICAL APPROACH},
  author={Marco Fatuzzo and Fulvio Melia and Elizabeth Todd and Fred C. Adams},
  journal={The Astrophysical Journal},
  year={2010},
  volume={725},
  pages={515-527}
}
The propagation of high-energy cosmic rays (CRs) through giant molecular clouds constitutes a fundamental process in astronomy and astrophysics. The diffusion of CRs through these magnetically turbulent environments is often studied through the use of energy-dependent diffusion coefficients, although these are not always well motivated theoretically. Now, however, it is feasible to perform detailed numerical simulations of the diffusion process computationally. While the general problem depends… Expand
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References

SHOWING 1-10 OF 32 REFERENCES
Transport of cosmic rays in chaotic magnetic fields
The transport of charged particles in disorganised magnetic fields is an important issue which concerns the propagation of cosmic rays of all energies in a variety of astrophysical environments, suchExpand
Numerical propagation of high energy cosmic rays in the Galaxy: I. Technical issues
We present the results of a numerical simulation of propagation of cosmic rays with energy above 1015 eV in a complex magnetic field, made in general of a large scale component and a turbulentExpand
Charged-Particle Motion in Multidimensional Magnetic Field Turbulence
We present a new analysis of the fundamental physics of charged-particle motion in a turbulent magnetic field using a numerical simulation. The magnetic field fluctuations are taken to be static andExpand
Molecular Clouds as a Probe of Cosmic-Ray Acceleration in a Supernova Remnant
We study cosmic-ray acceleration in a supernova remnant (SNR) and the escape from it. We model nonthermal particle and photon spectra for the hidden SNR in the open cluster Westerlund 2, and theExpand
Stochastic Acceleration in the Galactic Center HESS Source
Stochastic acceleration of electrons interacting resonantly with a turbulent magnetic field in a small accretion torus appears to be the likely mechanism responsible for much of Sagittarius A*'sExpand
Enhanced Cosmic-Ray Flux and Ionization for Star Formation in Molecular Clouds Interacting with Supernova Remnants
Molecular clouds interacting with supernova remnants may be subject to greatly enhanced irradiation by cosmic rays produced at the shocked interface between the ejecta and the molecular gas. Over theExpand
Broad-band non-thermal emission from molecular clouds illuminated by cosmic rays from nearby supernova remnants
Molecular clouds are expected to emit non-thermal radiation due to cosmic ray interactions in the dense magnetized gas. Such emission is amplified if a cloud is located close to an accelerator ofExpand
Discovery of very-high-energy γ-rays from the Galactic Centre ridge
The source of Galactic cosmic rays (with energies up to 1015 eV) remains unclear, although it is widely believed that they originate in the shock waves of expanding supernova remnants. At present theExpand
Diffuse X-Rays from the Inner 3 Parsecs of the Galaxy
Recent observations with the Chandra X-Ray Observatory have provided us with the capability to discriminate point sources, such as the supermassive black hole Sgr A*, from the diffuse emission withinExpand
Towards incorporating a turbulent magnetic field in an accreting black hole model
ABSTRACT A model proposed by Melia & Ruffert to evaluate the spectrum and radiation flux foraccretion on to a black hole makes use of the `equipartition assumption' in which themagnetic, turbulentExpand
...
1
2
3
4
...