articleAstronomy and AstrophysicsFeb 7, 2014BRONZE OA

Planck 2013 results. XX. Cosmology from Sunyaev–Zeldovich cluster counts

Cardiff University · Université Paris-Sud · +111 more institutions

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Abstract

We present constraints on cosmological parameters using number counts as a function of redshift for a sub-sample of 189 galaxy clusters from the Planck SZ (PSZ) catalogue. The PSZ is selected through the signature of the Sunyaev-Zeldovich (SZ) effect, and the sub-sample used here has a signal-to-noise threshold of seven, with each object confirmed as a cluster and all but one with a redshift estimate. We discuss the completeness of the sample and our construction of a likelihood analysis. Using a relation between mass M and SZ signal Y calibrated to X-ray measurements, we derive constraints on the power spectrum amplitude 8 and matter density parameter m in a flat CDM model. We test the robustness of our…

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