NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T02:27:06 PDT
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For refcode 2001MNRAS.326.1431G:
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Copyright by Royal Astronomical Society. 2001MNRAS.326.1431G Cold gas in elliptical galaxies A. Georgakakis, A.M. Hopkins, A. Caulton, T. Wiklind, A.I. Terlevich and Duncan A. Forbes Accepted 2001 May 21. Received 2001 May 21; in original form 2000 December 20 ABSTRACT We explore the evolution of the cold gas (molecular and neutral hydrogen) of elliptical galaxies and merger remnants ordered into a time sequence on the basis of spectroscopic age estimates. We find that the fraction of cold gas in early merger remnants decreases significantly for ~1-2 Gyr, but subsequent evolution toward evolved elliptical systems sees very little change. This trend can be attributed to an initial gas depletion by strong star formation, which subsequently declines to quiescent rates. This explanation is consistent with the merger picture for the formation of elliptical galaxies. We also explore the relation between the H I-to-H_2_ mass ratio and spectroscopic galaxy age, but find no evidence for a statistically significant trend. This suggests little net H I-to-H_2_ conversion for the systems in the present sample. Keywords: galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: starburst - radio continuum: galaxies.
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