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Constraints on SN Ia Progenitors and ICM Enrichment from Field and Cluster SN Rates

Published online by Cambridge University Press:  19 September 2016

D. Maoz  and
A. Gal-Yam
D. Maoz
Affiliation:
School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel; [email protected], [email protected]
A. Gal-Yam
Affiliation:
School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel; [email protected], [email protected]

Summary

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The iron mass in galaxy clusters is about 6 times larger than could have been produced by core-collapse SNe, assuming the stars in cluster galaxies formed with a standard IMF. Type-Ia SNe have been proposed as the alternative dominant iron source. We use our HST measurements of the cluster SN-Ia rate at high redshift to study the cluster iron enrichment scenario. The measurements can constrain the star-formation epoch and the SN-Ia progenitor models via the mean delay time between the formation of a stellar population and the explosion of some of its members as SNe-Ia. The low observed rate of cluster SNe-Ia at z ~ 1 pushes back the star-formation epoch in clusters to z > 2, and implies a short delay time. We also show a related analysis for high-z field SNe which implies, under some conditions, a long SN-Ia delay time. Thus, cluster enrichment by core-collapse SNe from a top-heavy IMF may remain the only viable option.

Type
Part VIII Supernovae, Gamma-Ray Bursters, and Cosmology
Information
International Astronomical Union Colloquium , Volume 192: Cosmic Explosions , 2005 , pp. 561 - 565
Copyright
Copyright © Springer-Verlag 2005

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