摘要: CO observations have shown that many lenticular and elliptical galaxies contain significant amounts of cool dense gas. This review summarizes the observational results related to neutral gas phase presents a systematic comparison with other interstellar stellar data. The discovery very molecular in nuclear regions early-type galaxies, possible existence dust component neither seen optically nor CO, internal inconsistencies cooling flow scenarios, origin gas, presence massive stars, aspects galaxy evolution, possibilities for future research are discussed light new
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