Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..461h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, June 1987, p. 461-466.
Astronomy and Astrophysics
Astronomy
24
Spiral Galaxies, Star Formation, Supernovae, Hydrogen Clouds, Irregular Galaxies, Star Formation Rate, Stellar Evolution
Scientific paper
Since Type II supernovae (SNs II) have never been observed in elliptical galaxies and tend to occur in the arms of spirals, it is generally believed that they are associated with the classic Population I tracers of the arms: giant H II regions and OB associations. However, this association has never been directly demonstrated with an adequate number of supernovae. An attempt was made to search for evidence of massive star formation in the immediate vicinity of 56 SNs II. High-quality optical galaxy photos have been located for 29 out of the 56 SNs II. Of these 29 supernovae, 25 lie toward or very near nebulous knots, the plausible signature of star-forming complexes. It is argued that such a large number of apparent coincidences cannot result from chance superposition. These coincidences provide the most direct evidence to date to support the hypothesis that most, if not all, SNs II arise from massive progenitors. The local environment of Type I supernovae in spiral and irregular galaxies is also discussed.
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