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arXiv 0708.0263astro-ph
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Ia型和II超新星对用朱雀观测的星团内介质中金属富集的贡献

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

Kosuke Sato, Kazuyo Tokoi, Kyoko Matsushita, Yoshitaka Ishisaki, Noriko Y. Yamasaki, Manabu Ishida, Takaya Ohashi

摘要:

利用朱雀X射线天文台对两个星系团(AWM 7和Abell 1060)和两个星系群(HCG 62和NGC 507)的团内介质(ICM)性质进行了研究。基于空间分辨能谱,我们首次测量了精确的累积ICM金属质量在0.1和~0.3 r_{180}。将我们的结果与超新星核合成模型进行比较,II型(SNe II)与Ia型(SNe Ia)的数量比估计为~3.5,假设ICM中的金属质量由SNe Ia和SNe II中合成的产物之和表示。以目前星系的K波段光度标准化,并包括恒星中的金属,过去SNe II爆炸的综合数量估计接近或略高于哈勃深场观测确定的恒星形成率。

英文摘要:

We studied the properties of the intra-cluster medium (ICM) in two clusters of galaxies (AWM 7 and Abell 1060) and two groups (HCG 62 and NGC 507) with the X-ray Observatory Suzaku. Based on spatially resolved energy spectra, we measured for the first time precise cumulative ICM metal masses within 0.1 and ~0.3 r_{180}. Comparing our results with supernova nucleosynthesis models, the number 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 products synthesized in SNe Ia and SNe II. Normalized by the K-band luminosities of present galaxies, and including the metals in stars, the integrated number of past SNe II explosions is estimated to be close to or somewhat higher than the star formation rate determined from Hubble Deep Field observations.

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