Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..621b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 15, 1986, p. 621-636. Research supported by the American Astronom
Astronomy and Astrophysics
Astronomy
31
Continuous Spectra, Density Wave Model, Galactic Structure, Radio Astronomy, Spiral Galaxies, Centimeter Waves, H Ii Regions, Linear Polarization, Nonthermal Radiation, Radiant Flux Density
Scientific paper
VLA observations of the radio continuum emission from M81 at wavelengths of 6 and 20 cm are presented and used to check the predictions of density-wave theories. Both thermal and nonthermal radiation are detected from the spiral arms. On maps with a resolution of 10arcsec - 15arcsec, the authors separate giant H II regions from the more extended, nonthermal arm emission and find that most of the bright knots along the radio arms are giant radio H II regions. The nonthermal emission defines spiral arms that are patchy and well-resolved, with a width of 1 - 2 kpc. The observed arm widths appear consistent with the predictions of density-wave models that emphasize the clumpy nature of the interstellar medium. The 20 cm arms appear to spiral outward from a faint inner H I ring. At large R the radio continuum arms are approximately logarithmic spirals although the two arms differ in pitch angle.
Bash Frank N.
Kaufman Michele
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