Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231l..27v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 2, May 1990, p. L27, L28.
Astronomy and Astrophysics
Astrophysics
6
Spiral Galaxies, Star Formation Rate, Starburst Galaxies, Supernovae, Galactic Evolution, Galactic Structure, Star Clusters
Scientific paper
The overwhelming majority of spiral galaxies, in which many supernovae have been discovered, are viewed almost pole-on. This observation may be understood if most supernovae in late-type spirals occur in rich star clusters and associations, which are located at the bottoms of vertical chimney-like structures, that are embedded in the equatorial gas and dust layers of these galaxies. This suggests that the high supernova discovery rate in pole-on galaxies is due to an inclination effect, rather than to an elevated rate of star and supernova formation. There is therefore no longer a need to assume that most spiral galaxies are presently either in an 'inert' or in a 'burst' phase.
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