The origin of cosmic rays. II - The cosmic-ray distribution and the spiral structure of NGC 3310. III - Particle acceleration by global spiral shocks

Details The origin of cosmic rays. II - The cosmic-ray distribution and the spiral structure of NGC 3310. III - Particle acceleration by global spiral shocks The origin of cosmic rays. II - The cosmic-ray distribution and the spiral structure of NGC 3310. III - Particle acceleration by global spiral shocks

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304...96d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 304, May 1, 1986, p. 96-114.

Astronomy and Astrophysics

Astrophysics

18

Cosmic Rays, Galactic Structure, Radiation Distribution, Spiral Galaxies, Astronomical Maps, Density Wave Model, Galactic Rotation, Particle Acceleration, Synchrotron Radiation

Scientific paper

The optical and radio continuum properties of the spiral arms of NGC 3310 are analyzed and intercompared. The likely presence of a strong density wave in NGC 3310 is demonstrated, and a number of observational results constraining the relationship between synchrotron emission, emission line radiation, and starlight are developed. The role of supernova remnants in the production of relativistic particles is investigated and found to be inconsistent with the constraints. The generation of cosmic rays by global spiral shocks via a Fermi-type shock acceleration process is shown to agree with all the major constraints, suggesting that the rotation of the galaxy powers the acceleration of particles to cosmic ray energies. A medium with temperature of 10,000 K, partially to fully ionized, is shown to support the diffusive shock acceleration mechanism.

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