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17 February 2011

X-ray mass proxies from hydrodynamic simulations of galaxy clusters (paper I)

Authors: Fabjan, Borgani, Rasia, Bonafede, Dolag, Murante & Tornatore

Two sets of zoom hydrodynamical simulations of galaxy clusters is used in this work to test the robustness and evolution of scaling relations between the total cluster mass and 3 mass proxies: the gas mass, the temperature of the intra-cluster medium and the product of the two: YX = MgasT. The largest set of about 140 galaxy clusters offers the opportunity to statistically test the intrinsic scatter of the scaling relations between the different proxies. A second smaller set allows to quantify the robustness of those relations against the effects of changing the physical processes included into the simulations. The following mechanisms have thus been compared: (i) thermal conduction, (ii) artificial viscosity, (iii) cooling and star formation, (iv) galactic winds, and (v) AGN feedback.
As found in the previous study of Kravtsov et al. (2006), the authors confirm that the relation with the YX parameter is the least sensitive to the variation of the ICM physics and stay lose to the predictions of the self-similar model along its redshift evolution.

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