Metals in the Intracluster Medium of MS 1512.4+3647 Observed with Suzaku : Implications for the Metal Enrichment History
Metals in the Intracluster Medium of MS 1512.4+3647 Observed with Suzaku : Implications for the Metal Enrichment History
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用朱雀观测到 MS 1512.4 3647 簇内介质中的金属：对金属富集历史的启示
DOI：
10.1093/pasj/65.5.111
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发表时间：
2013
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et al.
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作者：
Y. Shimoda;et al.
用朱雀望远镜对星系团MS 1512.4+3647（z= 0.372）进行了270 ks的观测。在一个中等红移的星系团（z> 0.3）中，除了Fe的丰度外，还首次分别测定了Mg、Si、S和Ni的丰度。MS 1512.4+3647的丰度模式与附近星团的丰度模式一致，表明该系统对附近星团的贡献与超新星Ia和SNe II相似。SNe II与SNe Ia的数量比为1.03。对气体质量的SNe II和SNe Ia的估计总数表明与附近的集群类似的相关性。MS 1512.4+3647的丰度结果与标准情景一致，即SN II速率历史大致遵循恒星形成历史，在1 <z< 2处有一个峰值，然后向z <0下降约一个数量级。Ia超新星的数量与附近的星团相似，这表明Ia超新星的速率从z = 0.37到z = 0急剧下降，并且/或者Ia超新星爆炸主要发生在较大的红移处。
The cluster of galaxies MS 1512.4+3647 (z= 0.372) was observed with Suzaku for 270 ks. Besides the Fe abundance, the abundances of Mg, Si, S, and Ni were separately determined for the first time in a medium redshift cluster (z> 0.3). The derived abundance pattern of MS 1512.4+3647 is consistent with those of nearby clusters, suggesting that the system has similar contributions from supernovae (SNe) Ia and SNe II to nearby clusters. The number ratio of SNe II to SNe Ia is ∼3. The estimated total numbers of both SNe II and SNe Ia against the gas mass indicate similar correlations with those for the nearby clusters. The abundance results of MS 1512.4+3647 is consistent with the standard scenario that the SN II rate history roughly follows the star-formation history, which has a peak at 1 <z< 2, and then declines by about one order of magnitude towardz∼ 0. The similar number of SNe Ia to the nearby clusters suggests that the SN Ia rate declines steeply fromz= 0.37 toz= 0, and/or SN Ia explosions occurred predominantly at larger redshifts.