Morphological Redshift Estimates for Galaxy Clusters in a Sunyaev-Zel'dovich Effect Survey

Abstract

We develop a new method to estimate the redshift of galaxy clusters through resolved images of the Sunyaev-Zel'dovich effect (SZE). Our method is based on morphological observables which can be measured by actual and future SZE experiments. We test the method with a set of high resolution hydrodynamical simulations of galaxy clusters at different redshifts. Our method combines the observables in a principal component analysis. After calibrating the method with an independent redshift estimation for some of the clusters, we show - using a Bayesian approach - how the method can give an estimate of the redshift of the galaxy clusters. Although the error bars given by the morphological redshift estimation are large, it should be useful for future SZE surveys where thousands of clusters are expected to be detected; a first preselection of the high redshift candidates could be done using our proposed morphological redshift estimator. Although not considered in this work, our method should also be useful to give an estimate of the redshift of clusters in X-ray and optical surveys.

10 pages, 8 figures. MNRAS in press. Improved version including referee's suggestions

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• Measuring cluster peculiar velocities with the Sunyaev-Zeldovich effects: scaling relations and systematics
• Measuring the Mach number of the Universe via the Sunyaev-Zeldovich effect
• Cosmology with the Planck cluster sample
• The Effects of Relativistic Corrections on Cosmological Parameter Estimations from SZE Cluster Surveys
• Redshift estimation of clusters by wavelet decomposition of their Sunyaev-Zel'dovich morphology