The most convincing evidence for ongoing ram

The most convincing evidence for ongoing ram - The most...

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The most convincing evidence for ongoing ram-pressure effects has come in the form of soft X- ray and optical emission-line trails from galaxies moving rapidly through dense clusters. Two such are known in Abell 1367. At higher redshift, I'll point to the galaxy C153 in Abell 2125 (which was already shown but not marked below). (More information on C153) . The denser molecular clouds are evidently less fragile than H I clouds. Stark et al. (1986, ApJ 310, 660) and Kenney and Young (1989, ApJ 344, 171) showed that the level of CO deficiency is less than H I deficiency; that is, H I -deficient galaxies are not as CO (which is to say H 2 ) deficient. This would result from tidal encounters as well as stripping, since the H I disks frequently are more extensive than CO disks and thus less strongly bound. Some galaxies show spectacular H I plumes while their optical images and CO distributions are not very disturbed (such as NGC 3628, Haynes et al. 1987 ApJ 229, 83; Young et al. 1983 ApJ 269, 136).
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This note was uploaded on 11/10/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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The most convincing evidence for ongoing ram - The most...

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