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Date and Time of the Query: 2019-05-25 T22:39:26 PDT
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For refcode 2007ApJ...657..232S:
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Copyright by American Astronomical Society. Reproduced by permission
2007ApJ...657..232S The Cool ISM in Elliptical Galaxies. I. A Survey of Molecular Gas Leslie J. Sage, Gary A. Welch, and Lisa M. Young Abstract. We present preliminary results from a survey of CO emission from members of a volume-limited sample of non-cluster elliptical galaxies. Our intent is to compare the gas properties of these ellipticals to a sample of lenticulars selected using similar criteria. The data, although still sparse, suggest that the cool gas in ellipticals shows the same puzzling upper mass cutoff found in the lenticular galaxies. We find, however, significantly lower detection rates and possibly much lower H_2_/H I mass ratios in the ellipticals. The detection rate is higher among the lower mass galaxies, as has been found previously. This seems puzzling given that the deeper potential wells of the larger galaxies ought to make gas retention easier, but perhaps that effect is overwhelmed by feedback from the central supermassive black hole. As we have observed ~40% of our full sample, the conclusions are necessarily tentative at this time. Key words: Galaxies: Elliptical and Lenticular, cD, Galaxies: Evolution, Galaxies: ISM
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