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A more direct measure of supernova rates in starburst galaxiesWe 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 (sub FIR) to be proportional to the supernova rate, we find r(sub SN) approximately equal 2 x 10(exp -12) x L(sub FIR), solar yr(exp -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.
Document ID
19950029365
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Van Buren, Dave
(California Inst. of Technology, Pasadena, CA United States)
Greenhouse, Matthew A.
(National Air and Space Museum, Washington, DC United States)
Date Acquired
August 16, 2013
Publication Date
August 20, 1994
Publication Information
Publication: The Astrophysical Journal
Volume: 431
Issue: 2 pt
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A60964
Funding Number(s)
CONTRACT_GRANT: NAGW-1711
Distribution Limits
Public
Copyright
Other

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