Abstract
The NIKA2 Sunyaev-Zel’dovich Large Program (SZLP) is focused on mapping the thermal SZ signal of a representative sample of selected Planck and ACT clusters spanning the redshift range 0.5 < z < 0.9. Hydrodynamical N-body simulations prove to be a powerful tool to endorse NIKA2 capabilities for estimating the impact of IntraCluster Medium (ICM) disturbances when re- covering the pressure radial profiles. For this goal we employ a subsample of objects, carefully extracted from the catalog Marenostrum MUltidark SImulations of galaxy Clusters (MUSIC), spanning equivalent redshift and mass ranges as the LPSZ. The joint analysis of real observations of the tSZ with NIKA2 and Planck enables to validate the NIKA2 pipeline and to estimate the ICM pressure profiles. Moreover, the possibility to identify a priori the dynamical state of the selected synthetic clusters allows us to verify the impact on the recovered ICM profile shapes and their scatters. Morphological analysis of maps of the Compton parameter seems to be a way to observationally segregate the sample based on the dynamical state in relaxed and disturbed synthetic clusters.
Highlights
Clusters of galaxies are a powerful target to provide useful cosmological information
Among the several objectives of the NIKA2 Sunyaev-Zel’dovich Large Program (SZLP) there is the characterization of the mean IntraCluster Medium (ICM) pressure profile properties and of the systematic uncertainties associated with departures from a simple model of high redshift objects in hydrostatic equilibrium allowing unbiased cosmological results [7]
A twin sample of the current catalog of clusters selected for the NIKA2 tSZ Large Program has been extracted from the MUltidark SImulations of galaxy Clusters (MUSIC) hydrodynamical simulation
Summary
Clusters of galaxies are a powerful target to provide useful cosmological information The abundance of these objects in the Universe, as function of total mass and redshift, is related to the mean matter density, Ωm, and the amplitude of matter perturbations at a scale of 8h−1Mpc, quantified with σ8 The Sunyaev-Zel’dovich (SZ) effect, mainly the thermal component (tSZ) i.e. the inverse Compton scattering of CMB photons with hot electron gas [2], is a suitable probe to map the ICM pressure distribution in clusters even at high redshifts. Combining this information with X-ray data it is possible to infer cluster masses under the assumption of hydrostatic equilibrium. In the case of large surveys, used to infer cosmological information, the overall cluster mass is directly inferred from the integrated tSZ flux over a solid angle being proportional to the thermal energy content of the galaxy clusters (see [3] and [4])
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