Confirmation of NIKA2 investigation of the Sunyaev-Zel'dovich effect by using synthetic clusters of galaxies

6 Jun 2019, 09:30


Prof. Marco De Petris (Dept. of Physics - University La Sapienza)


The NIKA2 Sunyaev-Zel'dovich Large Program (LPSZ) 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. Clusters science implementation to Cosmology can be biased due to inaccurate knowledge of IntraCluster Medium (ICM) pressure profiles in shape, scatter and redshift evolution. Hydrodynamical N-body simulations prove to be a powerful tool to endorse NIKA2 capabilities for estimating the impact of ICM disturbances when recovering the pressure radial profiles. For this goal we employ a subsample of objects, extracted from Marenostrum MUltidark SImulations of galaxy Clusters (MUSIC), spanning equivalent redshift and mass ranges of LPSZ. Realistic NIKA2 and Planck tSZ observations, jointly analyzed, enable to validate the NIKA2 pipeline and to estimate the ICM pressure profile of each cluster. Moreover, the possibility to identify a priori the dynamical state of all the synthetic clusters allows us to verify its impact on the recovered ICM profile shapes and their scatters. Morphological analysis of maps of the Comptonization parameter of each synthetic cluster seems to be a way to observationally segregate the sample between relaxed and disturbed objects. The clusters morphology is also correlated with the mass bias and its impact on the scatter of the integrated Comptonization parameter, Y500, and total mass, M500, scaling relation is discussed. Other observational dinamical state indicators, besides morphology, are also explored.

Primary author

Prof. Marco De Petris (Dept. of Physics - University La Sapienza)

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