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   72188
   Theoretical arguments and simulations suggest that the total mass of a
   galaxy cluster is tightly correlated to its x-ray temperature and that
   the lower end of the M-T relationship is sensitive to non-gravitational
   effects, such as energy injection by galactic winds. We have
   investigated the M-T relationship for a variety of mass estimation
   techniques. We propose ASCA observations of a sample of six low mass
   clusters to obtain accurate x-ray temperatures. This will nearly the
   double the number of clusters with accurate virial masses and ASCA
   temperatures in the region 2--3 keV and will allow a determination of
   the scaling of viral mass and temperature over the full range of rich
   cluster masses.
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