Titlebook: Cooling Flows in Clusters and Galaxies; A. C. Fabian Book 1988 Kluwer Academic Publishers 1988 cosmic ray.cosmology.observatory.quasar.rel

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Alternative Cooling Flow Models,ifficult or impossible to reproduce the observed temperature gradient while also reducing the net rate at which cooled gas is produced. None of the models examined lead to a viable alternative cooling flow scenario.

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Cooling Flow Filaments and the Emission-Line Gas in NGC1275,covering [OII]λ3727, H., [OIII] λ5007 and [SII]λλ6717, 6730 are presented. The line ratios are shown to be incompatible with the simplest model in which the gas is photoionized by a central active nucleus and lies at its projected distance from the nucleus.

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he free parameters involved are totally different. We feel that the agreement between the three . experiments is good and gives weight to the the numerical values of ? for the larger sample of objects observed only with the . IPC and HRI.

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l data. Although our estimates are formally only upper limits to the actual values of ? if the gas is being heated by some mechanism, this agreement is circumstantial evidence in favor of the existence of substantial cooling flows and against the dominance of conduction or other heat sources. For Pe

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