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   52112
   Supernova-driven mass outflows have been proposed to have profound
   effects on the formation and evolution of galaxies and on the enriching
   and energizing of the IGM. X-ray data provide unique insight into the
   superwind phenomenon because X-rays come directly from the wind
   material as well as shock-heated clouds and swept-up ambient ISM. We
   propose ASCA observations of two nearby starburst galaxies selected
   from the IRAS catalog, NGC 2146 and NGC 7552, for which we have strong
   optical evidence for outflows. The ASCA hard X-ray data will be of
   fundamental importance to help separate and differentiate between (i)
   very hot shock-heated plasma with Fe XXV emission lines and (ii) the
   combined emission of stellar coronal and binary sources.
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