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Using X-ray temperature and surface brightness profiles of the hotintracluster medium derived from ASCA and ROSAT observations we placeconstraints on the dark matter and baryon fraction distributions in the poorclusters Abell 1060 and AWM 7. Although their total mass distributions aresimilar, AWM 7 has twice the baryon fraction of Abell 1060 in the best-fitmodels. The functional form of the dark matter distribution is ill-determined,however mass models where the baryon fractions in Abell 1060 and AWM 7significantly overlap are excluded. Such variations in baryon fraction are notpredicted by standard models and imply that some mechanism in addition togravity plays a major role in organizing matter on cluster scales.

The Mass of Abell 1060 and AWM 7 from Spatially Resolved X-Ray Spectroscopy: Variations in Baryon Fraction