Sunyaev–Zel'dovich profiles and scaling relations: modelling effects and observational biases |
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| Authors: | A Bonaldi G Tormen K Dolag L Moscardini |
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| Institution: | INAF–Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy;Dipartimento di Astronomia, Universitàdi Padova, vicolo dell'Osservatorio 2, I-35122 Padova, Italy;Max-Planck-Institut für Astrophysik, Karl-Schwarzschild Strasse 1, D-85748 Garching, Germany;Dipartimento di Astronomia, Universitàdi Bologna, via Ranzani 1, I-40127 Bologna, Italy;INFN, Sezione di Bologna, viale Berti Pichat 6/2, I-40127 Bologna, Italy |
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| Abstract: | We use high-resolution hydrodynamic resimulations to investigate the properties of the thermal Sunyaev–Zel'dovich (SZ) effect from galaxy clusters. We compare results obtained using different physical models for the intracluster medium (ICM), and show how they modify the SZ emission in terms of cluster profiles and scaling relations. We also produce realistic mock observations to verify whether the results from hydrodynamic simulations can be confirmed. We find that SZ profiles depend marginally on the modelled physical processes, while they exhibit a strong dependence on cluster mass. The central and total SZ emission strongly correlates with the cluster X-ray luminosity and temperature. The logarithmic slopes of these scaling relations differ from the self-similar predictions by less than 0.2; the normalization of the relations is lower for simulations including radiative cooling. The observational test suggests that SZ cluster profiles are unlikely to be able to probe the ICM physics. The total SZ decrement appears to be an observable much more robust than the central intensity, and we suggest using the former to investigate scaling relations. |
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| Keywords: | hydrodynamics methods: numerical galaxies: clusters: general cosmic microwave background |
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