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• W2960951209 startingPage "A43" @default.
• W2960951209 abstract "In the framework of the hierarchical model the intra-cluster medium properties of galaxy clusters are tightly linked to structure formation, which makes X-ray surveys well suited for cosmological studies. To constrain cosmological parameters accurately by use of galaxy clusters in X-ray surveys, a better understanding of selection effects related to the detection method is needed. We aim at a better understanding of galaxy cluster morphologies to include corrections between the different core types and covariances with X-ray luminosities in selection functions. We stress the morphological deviations between a newly described surface brightness (SB) profile characterization and a commonly used single $beta$-model. We investigate a novel approach to describe SB profiles, where the excess cool-core emission in the galaxy cluster centres is modelled using wavelet decomposition. Morphological parameters and the residuals are compared to classical single $beta$-models. Using single $beta$-models to describe the ensemble of overall SB profiles leads on average to a non-zero bias ($0.032 pm 0.003$) in the outer part of the clusters, i.e. a $sim 3%$ systematic difference in the SB at large radii. In addition $beta$-models show a general trend towards underestimating the flux in the outskirts for smaller core radii. Fixing the $beta$ parameter to $2/3$ doubles the bias and increases the residuals from a single $beta$-model up to more than $40%$. Modelling the core region in the fitting procedure reduces the impact of these two effects significantly. We find a positive scaling between shape parameters and temperature, as well as a negative correlation ($sim-0.4$) between extent and luminosity. Our non-parametric analysis of the self-similar scaled emission measure profiles indicates no systematic core-type differences of median profiles in the galaxy clusters outskirts." @default.
• W2960951209 created "2019-07-23" @default.
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• W2960951209 date "2019-08-01" @default.
• W2960951209 modified "2023-09-30" @default.
• W2960951209 title "Toward a characterization of X-ray galaxy clusters for cosmology" @default.
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• W2960951209 doi "https://doi.org/10.1051/0004-6361/201935124" @default.
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