The Origin of Cosmic Rays. III. Particle Acceleration by Global Spiral Shocks

Details The Origin of Cosmic Rays. III. Particle Acceleration by Global Spiral Shocks The Origin of Cosmic Rays. III. Particle Acceleration by Global Spiral Shocks

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304..111d&link_type=abstract

Astrophysical Journal v.304, p.111

Astronomy and Astrophysics

Astronomy

12

Cosmic Rays: General, Galaxies: Individual Ngc Number: Ngc 3310, Particle Acceleration, Radio Sources: Galaxies, Shock Waves

Scientific paper

Cosmic-ray acceleration by global spiral shocks in galactic disks is investigated using existing theory. The diffusive shock acceleration (DSA) mechanism is discussed in the low-velocity regime represented by density wave shocks. It is found that a medium of T ≍ 104 K, partially to fully ionized, supports the DSA mechanism. It is concluded that existing theory permits particle acceleration by global, slow moving shocks as suggested by observational work on the spiral galaxy NGC 3310.

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