Radio Spurs and Spiral Structure of the Galaxy, II. On the Supernova Remnant Hypothesis for Spurs

A hypothesis that galactic spurs are due to nonthermal emission from supernova shells is shown to meet with some difficulties in the attempt to understand observational data on radio continuum distribution, starlight polarization, X-rays, Ha-emission, 21-cm line emission, and interstellar dark matter in the spur regions. A galactic shock hypothesis, that the spur is a result of tangential view to diffuse nonthermal source extending just above and along the spiral shocked region of the Galaxy, is more compatible with these observations. Key words: Galactic shock waves; Galaxy; Radio spurs; Supernova remnants.