Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..327s&link_type=abstract
Astronomy and Astrophysics, vol. 60, no. 3, Sept. 1977, p. 327-336. Research supported by the Alexander von Humboldt-Stiftung.
Astronomy and Astrophysics
Astrophysics
18
Background Radiation, Galactic Nuclei, Magnetohydrodynamic Waves, Radio Emission, Shock Wave Propagation, Coronas, Detonation Waves, Numerical Integration, Propagation Velocity, Shock Fronts, Wave Reflection
Scientific paper
The origin of the 3-kpc arm is considered on the basis of an explosion hypothesis with specific reference to the propagation of MHD shock waves from the galactic center through the galactic disk and halo. A previously proposed MHD model is improved by adopting a more realistic model of the Alfven-velocity distribution in the halo, and the effect of the MHD shock waves on background radio emission is examined. The origin of the North Polar Spur is discussed in terms of a galactic-scale MHD phenomenon associated with activity at the galactic center. Possible scenarios are outlined for the formation of the 3-kpc arm and the North Polar Spur which involve, respectively, MHD shock waves reflected by and escaping into the galactic halo.
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