PRECISE MEASUREMENTS OF METAL ABUNDANCE OF THE A3581 POOR CLUSTER

It has been found with ASCA that both type II and Ia upernovae significantlycontribute to metals in hot intracluster medium, based on the Si to Fe abundanceratio. In order to improve our understanding of relative contribution of bothsupernovae to the ICM, more accurate measurements of not only Fe but also otherelemental abundances are necessary. However, such measurements is limited torich clusters. Here we propose to observe a nearby bright poor cluster A3581 inorder to measure abundance pattern of the overall ICM for O, Mg, Si, S, and Fe.Furthermore, we can study the ICM enrichment processes by deriving a largescaleabundance gradient of not only Fe but also Si for the first time. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]