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2012•The Astrophysical JournalOpen access

JOINT ANALYSIS OF X-RAY AND SUNYAEV–ZEL'DOVICH OBSERVATIONS OF GALAXY CLUSTERS USING AN ANALYTIC MODEL OF THE INTRACLUSTER MEDIUM

Nicole Hasler, Esra Bülbül, Massimiliano Bonamente, J. E. Carlstrom, T. Culverhouse, Megan Gralla, Christopher H. Greer, David Hawkins, Ryan Hennessy, Marshall Joy, Jeffery Kolodziejczak, James W. Lamb, D. Landry, E. M. Leitch, A. Mantz, Daniel P. Marrone, Amber Miller, Tony Mroczkowski, Stephen Muchovej, T. Plagge, Clem Pryke, D. P. Woody

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Abstract

ABSTRACT We perform a joint analysis of X-ray and Sunyaev–Zel'dovich effect data using an analytic model that describes the gas properties of galaxy clusters. The joint analysis allows the measurement of the cluster gas mass fraction profile and Hubble constant independent of cosmological parameters. Weak cosmological priors are used to calculate the overdensity radius within which the gas mass fractions are reported. Such an analysis can provide direct constraints on the evolution of the cluster gas mass fraction with redshift. We validate the model and the joint analysis on high signal-to-noise data from the Chandra X-ray Observatory and the Sunyaev–Zel'dovich Array for two clusters, A2631 and A2204.

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ABSTRACT We perform a joint analysis of X-ray and Sunyaev–Zel'dovich effect data using an analytic model that describes the gas properties of galaxy clusters. The joint analysis allows the measurement of the cluster gas mass fraction profile and Hubble constant independent of cosmological parameters. Weak cosmological priors are used to calculate the overdensity radius within which the gas mass fractions are reported. Such an analysis can provide direct constraints on the evolution of the cluster gas mass fraction with redshift. We validate the model and the joint analysis on high signal-to-noise data from the Chandra X-ray Observatory and the Sunyaev–Zel'dovich Array for two clusters, A2631 and A2204.

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Available abstract

ABSTRACT We perform a joint analysis of X-ray and Sunyaev–Zel'dovich effect data using an analytic model that describes the gas properties of galaxy clusters. The joint analysis allows the measurement of the cluster gas mass fraction profile and Hubble constant independent of cosmological parameters. Weak cosmological priors are used to calculate the overdensity radius within which the gas mass fractions are reported. Such an analysis can provide direct constraints on the evolution of the cluster gas mass fraction with redshift. We validate the model and the joint analysis on high signal-to-noise data from the Chandra X-ray Observatory and the Sunyaev–Zel'dovich Array for two clusters, A2631 and A2204.

Key concepts: Physics, Galaxy cluster, Astrophysics, Intracluster medium, Redshift, Sunyaev–Zel'dovich effect, Cluster (spacecraft), Galaxy

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JOINT ANALYSIS OF X-RAY AND SUNYAEV–ZEL'DOVICH OBSERVATIONS OF GALAXY CLUSTERS USING AN ANALYTIC MODEL OF THE INTRACLUSTER MEDIUM — Research Paper | ScholarLens