Computer Science – Numerical Analysis
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232..582b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 2, June 1990, p. 582-588.
Computer Science
Numerical Analysis
15
Anisotropy, Black Body Radiation, Cosmic Rays, Energetic Particles, Energy Spectra, Active Galactic Nuclei, Diffusion Coefficient, Interstellar Magnetic Fields, Numerical Analysis, Spectrum Analysis
Scientific paper
The anisotropy of ultra-high energy cosmic rays (UHECR) is studied for a single source model, the particles propagating by diffusion in magnetic fields carried by galactic winds. The anisotropy is shown to decrease as energy increases if the cosmic rays are produced in a short pulse ('instant' source). For a longer pulse, anisotropy increases with energy: however, the rate of increase is smaller than in the stationary diffusion models. The possible origin of UHECR in one of the nearby active galactic nuclei (e.g. NGC 4151 or Cen A) is discussed. Anisotropy and spectra are calculated for these models. The predicted anisotropy is typically as low as 10-20 percent at energy E greater than or approximately equal to 10 to the 19th eV.
Berezinskii V. S.
Dogiel Vladimir A.
Grigor'eva S. I.
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