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- W2114920397 abstract "The molecular hydrogen content of a galaxy is a key parameter for its activity and future evolution. Its variations with basic properties such as size, mass, morphological type, and en- vironment, the ratio of molecular to atomic gas masses, should provide us with a better view of galaxy evolution. Such stud- ies have been done in the past by Sage (1993a) or the FCRAO group (e.g. Young & Knezek 1989), and have led to controver- sial results, for example about the MH2 =MHI ratio. While Sage (1993a), using a distance-limited sample of 65 galaxies and the CO(1{0) line emission as a tracer of the H2 mass, nds that most galaxies have MH2 =MHI lower than 1, Young & Knezek (1989) and Young et al. (1995), from a different sample of 178 objects, claim equal amounts of gas in the molecular and atomic phase. Here we again tackle this problem, by gathering a much larger sample of 582 objects, not only from the literature but also from several CO(1{0) surveys that we have completed and which are largely unpublished. Our sample is clearly not com- plete and contains a large number of cluster galaxies as well as many more massive objects than a distance-limited sample. Contrary to previous analyses, we have taken into account the non-detections by using the survival analysis method. Our sam- ple includes 105 isolated galaxies, observed by us, that we use as a reference sample in order to determine whether cluster galaxies are CO-decient. We nd that the ratio of H2 and HI masses is on the average lower than 1, with = log(0.20) 0.04 (me- dian = log(0.27) 0.04). For spirals with types Sa to Sc, we have slightly higher values: log(0.28) and log(0.34) respectively. The actual H2 masses and MH2 =MHI ratios could be lower than given above if, as suggested by recent-ray and 1.3 mm contin- uum data, the conversion factor between CO(1{0) emissivities and H2 masses for large spiral galaxies is lower than the value" @default.
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- W2114920397 date "1998-03-01" @default.
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- W2114920397 title "Molecular gas in spiral galaxies" @default.
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