Cluster Baryon Fraction and Structure from the Convergence/SZ Effect Diagram

K Umetsu, J-M Wu, T Chiueh, M Birkinshaw

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Abstract

The cross-correlation of Sunyaev-Zel'dovich effect (SZ) and weak-lensing imaging surveys can be used to test how well hot baryons trace dark matter in clusters of galaxies. We examine this concept using mock SZ and weak-lensing surveys based on the forthcoming AMiBA experiment and generated from a pre-heated cosmological N-body/hydrodynamic simulation. A cross-correlation diagram between matched lensing convergence and Compton y maps exhibits butterfly-wing-like structures, corresponding to individual clusters, that encode rich information about the distributions of hot gas and dark matter. When the cluster redshift and temperature are available the slope of a wing reveals the cluster gas fraction and the width of the wing indicates how badly the hot gas traces dark matter. On the basis of simulated data we discuss systematic errors in the projected gas fraction estimates that would be obtained from such survey comparisons.
Translated title of the contributionCluster Baryon Fraction and Structure from the Convergence/SZ Effect Diagram
Original languageEnglish
PublisherCornell University Press
Publication statusPublished - 2 Jun 2005

Bibliographical note

Other: Submitted to Ap. JL (The Astrophysical Journal Letters)

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    Umetsu, K. (Author), Wu, J-M. (Author), Chiueh, T. (Author), & Birkinshaw, M. (Author). (2005). Cluster Baryon Fraction and Structure from the Convergence/SZ Effect Diagram. Web publication/site, Cornell University Press. http://arxiv.org/abs/astro-ph/0506065v1