Environmental Effects on Galaxies

Environmental Effects on Galaxies - dilemma If we are quite...

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Environmental Effects on Galaxies Galaxy environments span a wide range of density both of galaxies themselves and of intergalactic material, with the extremes being really isolated galaxies versus those in the cores of rich clusters (we will deal with galaxy pairs separately, since the processes operating in pairs and dense cluster environents are rather different). Thus we may test for systematic differences between galaxies in various environments. Any such differences then tell us either that certain kinds of galaxies do not form in regions that will become, say, rich clusters, or that these kinds of galaxies do not survive unaltered in such environments (the heredity versus environment
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Unformatted text preview: dilemma). If we are quite fortunate and can see such alterations in progress, we would know that at least some genuinely environmental effects take place. The relevant galaxy properties include: (1) morphological types (2) gas content and radial distribution (3) extent of tidal truncation, both of visible and unseen mass Morphological types show striking differences between various environments. If we tabulate the percentages of various galaxy types in rich and poor clusters and in the "field", a clear distinction emerges: Type: cD E+S0 S+I Rich clusters 93 56 38 Poor clusters 6 20 14 Field" < 6 < 24 48...
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