Cosmic rays in the Small Magellanic Cloud

Details Cosmic rays in the Small Magellanic Cloud Cosmic rays in the Small Magellanic Cloud

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..447s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 447-453.

Astronomy and Astrophysics

Astronomy

13

Cosmic Rays, Gamma Ray Astronomy, Magellanic Clouds, Particle Flux Density, Density Distribution, Milky Way Galaxy, Radiant Flux Density, Synchrotron Radiation

Scientific paper

The SMC is investigated in order to determine whether this galaxy is in dynamic quasi-stable equilibrium between the expansive pressure of the hot cosmic ray gas, the magnetic fields, and the kinetic motion of interstellar gas and the gravitational attraction of matter. It is argued that the cosmic ray density level is three to five times smaller than that which would exist if the galaxy were in approximate dynamic equilibrium and cosmic ray sources were adequate. The scale of coupling between the cosmic rays and matter in the projected dimension that can be observed is less than 0.5 kpc, which is rather small to be consistent with a stable cosmic ray distribution. The observed matter distribution and the calculated cosmic ray density distribution are used to determine the expected gamma ray intensity distribution.

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