Other
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..385g&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Mar. 1, 1979, p. 385-393.
Other
53
Galactic Clusters, Galactic Evolution, Interstellar Gas, Spiral Galaxies, Ablation, Astronomical Models, Stellar Evolution, Stellar Mass Ejection
Scientific paper
The hypothesis that many S0 galaxies in clusters are former spirals that have been stripped of their gas by ram-pressure ablation is reconsidered in light of the observations of Butch and Oemler (1978), who discovered many more blue (i.e., unstripped) galaxies in dense relaxed clusters at z = 0.4 than in similar clusters near the present epoch. It is shown that the maximum possible rate of gas removal from a galaxy depends strongly and nonlinearly on the rate of gas ejection from evolving stars, so that ram-pressure ablation cannot remove any gas if the ejection rate is sufficiently high. Gas-replenishment rates for young-population galaxies are computed under a variety of assumptions regarding the stellar remnant/ejectum relation and the initial mass function (IMF). The results indicate that such galaxies in dense clusters may be invulnerable to gas stripping for the first (8 to 10) billion years of evolution, particularly if the IMF is shallow. Other implications of the calculations and constraints on the IMF index are discussed.
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