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Context: Measurements of intracluster gas temperatures out to large radii areimportant for the use of clusters for precision cosmology and for studies ofcluster physics. Previous attempts to measure robust temperatures at clustervirial radii failed. Aims: The goal of this work is to measure the temperatureprofile of the very relaxed galaxy cluster Abell 2204 out to large radii,possibly reaching the virial radius. Methods: Taking advantage of its lowparticle background due to its low-Earth orbit, Suzaku data are used to measurethe outer temperature profile of Abell 2204. These data are combined withChandra and XMM-Newton data of the same cluster in order to make the connectionto the inner regions, unresolved by Suzaku, and to determine the smearing dueto Suzaku's PSF. Results: The temperature profile of Abell 2204 is determinedfrom 10 kpc to 1800 kpc, close to an estimate of r200 (the approximation to thevirial radius). The temperature rises steeply from below 4 keV in the verycenter up to more than 8 keV in the intermediate range and then decreases againto about 4 keV at the largest radii. Varying the measured particle backgroundnormalization artificially by +-10 percent does not change the resultssignificantly. Predictions for outer temperature profiles based on hydrodynamicsimulations show good agreement. In particular, we find the observedtemperature profile to be slightly steeper but consistent with a drop of afactor of 0.6 from 0.3 r200 to r200, as predicted by simulations. Conclusions:Temperature measurements up to the virial radius seem feasible with Suzaku,when a careful analysis of the different background components and the effectsof the PSF is performed. The result obtained here indicates that numericalsimulations capture the intracluster gas physics well in cluster outskirts.

Suzaku measurement of Abell 2204's intracluster gas temperature profile out to 1800 kpc