Paper:	Supernova Rates in Galaxy Clusters
Volume:	342, 1604-2004: Supernovae as Cosmological Lighthouses
Page:	149
Authors:	Maoz, D.
Abstract:	Measurements of supernova (SN) rates in different environments and redshifts can shed light on the nature of SN-Ia progenitors, star formation history, and chemical enrichment history. I summarize some recent work by our group in this area, and discuss the implications. The current evidence favors production of most of the iron in the intra-cluster medium (and perhaps everywhere) by core-collapse SNe, rather than SNe-Ia. These SNe may have been produced by the first, top-heavy-IMF, generation of stars that reionized the Universe. Improved rate measurements can sharpen the picture, and I describe our recent efforts in this direction.

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