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

Details How the Intrinsic Shapes of Galaxy Clusters Influence Distance Determinations using the SZ Effect How the Intrinsic Shapes of Galaxy Clusters Influence Distance Determinations using the SZ Effect

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5802h&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #58.02; Bulletin of the American Astronomical Society, Vol. 31, p.915

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Scientific paper

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 H_0 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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