Reconstructing three-dimensional parameters of galaxy clusters via multifrequency Sunyaev–Zeldovich observations

ABSTRACT The Sunyaev-Zeldovich (SZ) effect is a promising tool to study physical properties ofthe hot X-ray emitting intracluster medium (ICM) in galaxy clusters. To date, most SZobservations have been interpreted in combination with X-ray follow-up measurementsin order to determine the ICM temperature and estimate the cluster mass. Futurehigh-resolution, multifrequency SZ observations promise to enable detailed studies ofthe ICM structures, by measuring the ICM temperature through the temperature-dependent relativistic corrections. In this work we develop a non-parametric methodto derive three-dimensional physical quantities, including temperature, pressure, totalmass, and peculiar velocities, of galaxy clusters from SZ observations alone. We testthe performance of this method using hydrodynamical simulations of galaxy clusters,in order to assess systematic uncertainties in the reconstructed physical parameters.In particular, we analyze mock Cerro Chajnantor Atacama Telescope (CCAT) SZobservations,takinginto account varioussourcesofsystematic uncertainties associatedwith instrumental effects and astrophysical foregrounds. We show that our methodenables accurate reconstruction of the three-dimensional ICM profiles, while retainingfull informationabout the gasdistribution. We discuss the application ofthis techniquefor ongoing and future multifrequency SZ observations.Keywords: cosmology: observations – galaxies: clusters: general – X-rays: galaxies:clusters – cosmic microwave background

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