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• W2110205213 endingPage "1010" @default.
• W2110205213 startingPage "989" @default.
• W2110205213 abstract "We have assembled a large sample of virialized systems, comprising 66 galaxy clusters, groups and elliptical galaxies with high-quality X-ray data.To each system we have fitted analytical profiles describing the gas density and temperature variation with radius, corrected for the effects of central gas cooling.We present an analysis of the scaling properties of these systems and focus in this paper on the gas distribution and M—TX relation.In addition to clusters and groups, our sample includes two early-type galaxies, carefully selected to avoid contamination from group or cluster X-ray emission.We compare the properties of these objects with those of more massive systems and find evidence for a systematic difference between galaxy-sized haloes and groups of a similar temperature. We derive a mean logarithmic slope of the M—TX relation within R200 of 1.84 ± 0.06, although there is some evidence of a gradual steepening in the M—TX relation, with decreasing mass.We recover a similar slope using two additional methods of calculating the mean temperature.Repeating the analysis with the assumption of isothermality, we find the slope changes only slightly, to 1.89 ± 0.04, but the normalization is increased by 30 per cent.Correspondingly, the mean gas fraction within R200 changes from (0.13 ± 0.01) h−3/270 to (0.11 ± 0.01) h−3/270, for the isothermal case, with the smaller fractional change reflecting different behaviour between hot and cool systems.There is a strong correlation between the gas fraction within 0.3R200 and temperature.This reflects the strong (5.8σ) trend between the gas density slope parameter, β, and temperature, which has been found in previous work. These findings are interpreted as evidence for self-similarity breaking from galaxy feedback processes, active galactic nuclei heating or possibly gas cooling.We discuss the implications of our results in the context of a hierarchical structure formation scenario." @default.
• W2110205213 created "2016-06-24" @default.
• W2110205213 creator A5012096307 @default.
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• W2110205213 creator A5046983127 @default.
• W2110205213 creator A5054995825 @default.
• W2110205213 creator A5066289165 @default.
• W2110205213 date "2003-04-11" @default.
• W2110205213 modified "2023-09-27" @default.
• W2110205213 title "The Birmingham--CfA cluster scaling project -- I.Gas fraction and the M--TX relation" @default.
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• W2110205213 doi "https://doi.org/10.1046/j.1365-8711.2003.06401.x" @default.
• W2110205213 hasPublicationYear "2003" @default.
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