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arxiv: astro-ph/0108320 · v2 · pith:J7DWL4XPnew · submitted 2001-08-20 · 🌌 astro-ph

Sunyaev-Zel'dovich Effect and Morphology of Galaxy Clusters

R. Piffaretti (Institute of Theoretical Physics , Univ. of Zurich , PSI - CH) , Ph. Jetzer (Institute of Theoretical Physics , ETH Zurich - CH) , D. Puy (Institute of Theoretical Physics , S. Schindler (Astrophysics Research Institute , Liverpool John Moores Univ. - UK) This is my paper
classification 🌌 astro-ph
keywords galaxygeometryasphericalclusterdovicheffectestimatemass
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We investigate the influence of the finite extension and the aspherical geometry of a galaxy cluster on the estimate of the Hubble constant through the Sunyaev-Zel'dovich effect. An analysis of a recent CHANDRA image of the galaxy cluster RBS797 indicates a strong ellipticity and thus a pronounced aspherical geometry. We estimate the total mass of RBS797 assuming spherical or ellipsoidal geometry and show that in the latter case the mass is about 10-17 % less than the one inferred for a spherical shape.

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