Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..40..357o&link_type=abstract
Astrophysics and Space Science, vol. 40, Apr. 1976, p. 357-367. Research supported by the Research Corp.
Astronomy and Astrophysics
Astrophysics
15
Age Factor, Astronomical Models, Galactic Radiation, Primary Cosmic Rays, Anisotropy, Monte Carlo Method, Statistical Distributions, Three Dimensional Models
Scientific paper
The general solution for the distribution of ages for primary galactic cosmic rays is given for a class of steady-state bounded models of cosmic-ray diffusion in the Galaxy. Both one- and three-dimensional models are considered, with point sources and distributed sources. In all models, the age distribution is approximately exponential for ages longer than the average age, although for shorter ages, the distribution depends on the details of the model. The leaky-box model, with an exponential age distribution, is thus a good approximation to most diffusive models. It is shown that one-dimensional ('disk') models are consistent with both age and anisotropy data for galactic cosmic rays regardless of whether production takes place near the galactic center or throughout the disk.
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