Brief history of the metal accumulation in the intracluster medium

Details Brief history of the metal accumulation in the intracluster medium Brief history of the metal accumulation in the intracluster medium

2005-06-13

arxiv.org/abs/astro-ph/0506272v2

Mon.Not.Roy.Astron.Soc.362:110-116,2005

Astronomy and Astrophysics

Astrophysics

8 pages, MNRAS in press. Minor changes to match published version

Scientific paper

10.1111/j.1365-2966.2005.09284.x

We use 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 intra-cluster medium. We 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, we verify that the predicted metals to Iron ratios reproduce the measurements obtained in nearby clusters through X-ray analysis, implying that (1) about half of the Iron mass and >75 per cent of the Nickel mass observed locally are produced by SN Ia ejecta, (2) the SN Ia contribution to the metal budget decreases steeply with redshift and by z~1 is already less than half of the local amount and (3) a transition in the abundance ratios relative to the Iron is present between redshifts ~0.5 and 1.4, with core-collapse SN products becoming dominant at higher redshifts.

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