Correlation between baryon mass and intergalactic gas temperature in nearby galaxy clusters |
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| Authors: | A A Voevodkin A A Vikhlinin M N Pavlinsky |
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| Institution: | (1) Space Research Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117810, Russia |
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| Abstract: | We measured the correlation between baryon mass and intracluster gas temperature in nearby galaxy clusters selected from the ROSAT All-Sky Survey. The mass of the intracluster gas was determined directly from an analysis of X-ray images. A correlation was found between the gas mass and the mass of the cluster stellar matter, which was used to determine the total baryon mass (i.e., gas + stars). The mass was measured within the radii corresponding to overdensities of 324 and 500 relative to the mean baryon density inferred from the theory of primordial nucleosynthesis. The measured correlation between baryon mass and temperature is close to that predicted by a self-similar theory of cluster formation: M ∝ T 3/2. |
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| Keywords: | galaxy clusters cosmology large-scale structure of Universe |
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