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Hot coronae around early-type galaxies
The analysis of the X-ray emission from a sample of 55 bright early-typegalaxies shows that hot gaseous coronae are a common and perhapsubiquitous feature of such systems. The X-ray emission can be explainedmost naturally as thermal bremsstrahlung from hot gas which may beaccumulated from mass loss during normal stellar evolution. The presenceof these coronae shows that matter previously thought to be expelled ina galactic wind is instead stored in a hot galactic corona which may beheated and powered by supernova explosions. Perhaps the single mostimportant feature of these coronae is that they provide a unique tracerof the gravitational potential in the outer regions of bright early-typegalaxies. In this paper the X-ray properties of these coronae and theirimplications for the presence of massive dark halos around individualearly-type galaxies are discussed. Total masses of early-type galaxiesup to 5 trillion solar masses are found.
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