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OATS-DAUT SEMINAR
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Speaker: Stefano Ettori (INAF-OABO)

Title: A history of the metal accumulation in the intracluster medium

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Abstract: I present recent results on the metal enrichment of the intra-cluster medium, both at large scales and in the very inner regions, where we suspect sedimentation of helium can take place in cooling core clusters with important implications on the observed gradients in the metal abundance. I use then models of the rates of Type Ia supernovae (SNe Ia) and core-collapse supernovae, built in such a way that both are consistent with recent observational constraints at z<1.6 and can reproduce the measured cosmic star formation rate, to recover the history of the metals accumulation in the ICM. I show that these SN rates, in unit of SN number per comoving volume and rest-frame year, provide on average a total amount of Iron that is marginally consistent with the value measured in galaxy clusters in the redshift range 0-1, and a relative evolution with redshift that is in agreement with the observational constraints up to z~1.2. Moreover, I verify that the predicted metals to Iron ratios reproduce the measurements obtained in nearby clusters through X-ray analysis.
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