Abstract
The study of gas in early type galaxies began at least as early as 1957 when SANDAGE [1] estimated that during the course of normal stellar evolution, the stars of a bright elliptical galaxy would shed ~5×109 M ⊙ of gas. Over the last 25 years, limits on various forms of gas in early type galaxies became increasingly stringent. Models for a galactic wind, like that of MATHEWS and BAKER [2], were developed to explain the absence of gas. However NORMAN and SILK [3] and SARAZIN [4] argued that galaxies with massive halos could maintain gaseous coronae over cosmological times and could overcome the heating from supernovae.
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