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Unformatted text preview: shows that hotter clusters match well (the ratio, known as the parameter, is close to unity) while for cooler clusters, the gas is too hot, indicating that the energy input from galactic winds (presumably driven by the enriching supernovae) is important compared to these shallower potentials. The presence of significant hot gas sets in somewhere in the group scale, as in the notorious NGC 2300 ROSAT report (Mulchaey et al. 1993 ApJL 404, L9). However, the detections of diffuse X-ray matter in groups are spotty, perhaps dependent on the galaxy types (being more likely when there are ellipticals present)....
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- Fall '10