Probing the Formation of Galaxy Clusters and their Members

探索星系团及其成员的形成

• 批准号: 20740116
• 负责人: OTA Kazuaki
• 金额: $ 2.66万
• 依托单位: The Institute of Physical and Chemical Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20740116/
• 关键词: 可視光天文学; 観測的宇宙論; 高赤方偏移銀河; 銀河形成; 銀河進化; 観測天文学; 銀河団; 初期宇宙; 撮像・分光

We compared volume and mass of the redshift z=6 (900 million years after the Big Bang) galaxy proto-cluster candidates we found with those of galaxy clusters at z<6 to examine how such physical properties have changed until today (z=0, 13.7 billion year after the Big Bang). We found that the z=6 proto-cluster has a larger volume but the masses are comparable. This implies that this z=6 object could be a progenitor and evolve to be a galaxy cluster seen in the present-day universe, assembling the mass toward the smaller volume. Also, our result suggests that the structure formation was already in a matured phase and formation of galaxy clusters were taking place even at the epoch as early as the 900 million year universe.

我们将我们发现的红移 z=6（大爆炸后 9 亿年）星系原星团候选者的体积和质量与 z<6 处的星系团的体积和质量进行了比较，以研究这些物理特性直到今天（z=0 ，大爆炸后 137 亿年）。我们发现 z=6 原星团的体积较大，但质量相当。这意味着这个 z=6 的物体可能是一个祖先，并演化为当今宇宙中可见的星系团，将质量聚集到较小的体积。此外，我们的结果表明，结构形成已经处于成熟阶段，甚至早在宇宙九亿年的时代就已经开始形成星系团。

项目成果

Probing Reionization and Galaxy Evolution by High Redshift Lyman-alpha Emitters

利用高红移莱曼-α 发射器探测再电离和星系演化

• 发表时间: 2008
• 作者: 太田一陽