Supernova rates and bursts of star formation

Details Supernova rates and bursts of star formation Supernova rates and bursts of star formation

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...206..219r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 2, Nov. 1988, p. 219-226.

Astronomy and Astrophysics

Astrophysics

24

Irregular Galaxies, Spiral Galaxies, Star Formation, Supernovae, Astronomical Catalogs, Bursts, Gravitational Effects, Luminosity, Star Formation Rate, Stellar Mass

Scientific paper

A new analysis of supernova (SN) rates in spiral and irregular galaxies is presented. It is shown that the concept of a single average SN rate for all 'normal' galaxies has to be abandoned. Normal galaxies belong to two distinct classes with regard to the formation of SN II progenitors: most galaxies are rather inactive while a small percentage of galaxies in a 'burst' phase is producing these massive stars vigorously. The initial mass function during such bursts must be notably different from that determined in the solar neighborhood. It has to be strongly biased toward stars with masses above about eight solar. The formation of massive stars follows a pattern fundamentally different from that of low and intermediate-mass stars. It occurs episodically and apparently over entire disks of spirals, in particular Sc galaxies.

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