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We studied the properties of the intra-cluster medium (ICM) in two clustersof galaxies (AWM 7 and Abell 1060) and two groups (HCG 62 and NGC 507) with theX-ray Observatory Suzaku. Based on spatially resolved energy spectra, wemeasured for the first time precise cumulative ICM metal masses within 0.1 and~0.3 r_{180}. Comparing our results with supernova nucleosynthesis models, thenumber ratio of type II (SNe II) to type Ia (SNe Ia) is estimated to be ~3.5,assuming the metal mass in the ICM is represented by the sum of productssynthesized in SNe Ia and SNe II. Normalized by the K-band luminosities ofpresent galaxies, and including the metals in stars, the integrated number ofpast SNe II explosions is estimated to be close to or somewhat higher than thestar formation rate determined from Hubble Deep Field observations.

Type Ia and II supernovae contributions to the metal enrichment in intra-cluster medium observed with Suzaku