Departament d'Astronomia i Astrofísica
Universitat de València

    On the role of AGN feedback on the thermal and chemodynamical properties of the hot intracluster medium

Susana Planelles

Astronomy Unit, Department of Physics, University of Trieste, INAF-Osservatorio Astronomico di Trieste, Itàlia

Seminari del departament d'Astronomia i Astrofisica

Dijous 19 desembre 2013



Reproducing the observed X-ray scaling relations, the cooling flow problem, and the different thermal properties of cool core and non-cool core clusters still represent a challenge for current cosmological simulations of galaxy clusters. In this talk, I will present the general analysis of a set of cosmological hydrodynamical simulations of galaxy clusters and groups, performed with the SPH GADGET-3 code, with the aim of studying the relative role played by different feedback sources on the general intracluster medium (ICM) properties: scaling relations, thermal radial profiles, and chemical enrichment. In order to do so, besides a set of non-radiative simulations, we carried out two sets of simulations including radiative cooling, star formation, metal enrichment and feedback from supernovae, one of which also accounts for the effect of feedback from active galactic nuclei (AGN) resulting from gas accretion onto super-massive black holes. Our results confirm that including AGN feedback goes in the right direction of reconciling simulation predictions and observations for several observational ICM properties. However, a number of important discrepancies still exist, highlighting that the model needs to be improved to produce the correct interplay between cooling and feedback in central cluster regions.