AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 58. The Sunyaev-Zel'dovich Effect: Latest Results and Future Prospects
Topical, Oral, Tuesday, June 1, 1999, 2:30-4:00pm, 4:15-6:00pm, Continental Ballroom B

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[58.02] How the Intrinsic Shapes of Galaxy Clusters Influence Distance Determinations using the SZ Effect

J.P. Hughes (Rutgers University)

The intrinsic 3-D shape of the hot gas in clusters of galaxies has a critical influence on the interpretation of X-ray and Sunyaev-Zel'dovich (SZ) effect data for cosmological parameter estimation. I present a study of the intrinsic shapes of galaxy clusters under the axisymmetric hypothesis based on two X-ray cluster samples, using a nonparametric approach and the technique of ``maximum penalized likelihood'' for function estimation. In this talk, the uncertainty in H0 from unknown geometry for any observed cluster axial ratio is quantified. I conclude with some general comments on the intrinsic shape of X-ray galaxy clusters.

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