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   PR # 41122
   We have found that the thermal energy per unit mass of the hot gas in
   early type galaxies is greater than the stellar thermal energy per
   unit mass. The excess gas temperature increases as the stellar
   velocity dispersion decreases, which suggests that there may be
   additional mechanisms to the gravitational heating. This heating
   mechanisms may not be stellar origin like supernova explosions. To
   reveal this mechanisms, we propose the observations of early type
   galaxies which have low velocity dispersions and low blue band
   luminosities.
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