Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266...37b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 37-56.
Astronomy and Astrophysics
Astronomy
62
H Lines, Interstellar Gas, Radio Astronomy, Spiral Galaxies, Astronomical Spectroscopy, Emission Spectra, Galactic Structure, H Ii Regions, Radio Emission, Spatial Distribution
Scientific paper
The study presents H I and radio continuum observations of the Scd galaxy NGC 6946 at about 25-arcsec resolution, obtained with the Westerbork Synthesis Radio Telescope and the Penticton interferometer. The data from the two interferometers are combined to measure the emission of the galaxy on all angular scales down to 25 arcsec. It is shown that about one-third of the 21- and 50-cm radio-continuum emission comes from the spiral arms; this emission, which has an average spectral index of 0.55, is mainly nonthermal. The other two-thirds of the emission comes from an exponential disk which has a spectral index of 0.8 and a scale-length of 1.7 arcmin similar to the one measured for the blue light. The highest concentrations of H I emission coincide with the spiral arms of the galaxy. The H I spiral arms are fragmented in giant complexes with masses of a few 10 exp 7 solar masses and lengths of a few kpc.
Boulanger Francois
Viallefond Francois
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