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- W2145986411 abstract "The intrinsic shape of galaxy clusters can be obtained through a combination of X-ray and Sunyaev-Zeldovich effect observations once cosmological parameters are assumed to be known. In this paper we discuss the feasibility of modeling galaxy clusters as either prolate or oblate ellipsoids. We analyze the intracluster medium distribution for a sample of 25 X-ray-selected clusters, with measured Sunyaev-Zeldovich temperature decrements. A mixed population of prolate and oblate ellipsoids of revolution fits the data well, with prolate shapes preferred by ~60%-76%. We observe an excess of clusters nearly aligned along the line of sight, with respect to what is expected from a randomly oriented cluster population, which might imply the presence of a selection bias in our sample. We also find signs that a more general triaxial morphology might better describe the morphology of galaxy clusters. Additional constraints from gravitational lensing could disentangle the degeneracy between an ellipsoidal and a triaxial morphology, and could also allow an unbiased determination of the Hubble constant." @default.
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- W2145986411 date "2006-07-01" @default.
- W2145986411 modified "2023-09-24" @default.
- W2145986411 title "Measuring the Three‐dimensional Structure of Galaxy Clusters. II. Are Clusters of Galaxies Oblate or Prolate?" @default.
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- W2145986411 doi "https://doi.org/10.1086/503198" @default.
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