A more direct measure of supernova rates in starburst galaxies

Details A more direct measure of supernova rates in starburst galaxies A more direct measure of supernova rates in starburst galaxies

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...431..640v&link_type=abstract

The Astrophysical Journal, vol. 431, no. 2, pt. 1, p. 640-644

Other

39

Galactic Evolution, Radio Emission, Star Formation Rate, Starburst Galaxies, Supernova Remnants, Supernovae, Cosmology, Far Infrared Radiation, Luminosity, Stellar Mass, Stellar Mass Ejection

Scientific paper

We determine ages for young supernova remnants in the starburst galaxies M82 and NGC 253 by applying Chevalier's model for radio emission from supernova blast waves expanding into the ejecta of their precursor stars. Absolute ages are determined by calibrating the model with radio observations of Cas A. We derive supernova rates of 0.10 and 0.08/yr for M82 and NGC 253, respectively. Assuming L FIR to be proportional to the supernova rate, we find rSN approximately equal 2 x 10-12 x LFIR, solar yr-1 for these archetypal starburst galaxies. This approach is unique in that the supernova rate is derived from direct observation of supernova remnants rather than from star formation rates and an assumed initial mass function (IMF). We suggest that the approach presented here can be used to derive star-formation rates that are more directly related to observable quantities than those derived by other methods. We find that the supernova rate, far infrared (FIR) luminosity, and dynamical mass of the M82 starburst place few constraints on the initial mass function (IMF) slope and mass limits.

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