Study on the Evolution of Stellar Mass Distribution at High-z Universe with Multi-Object Infrared Camera and Spectrograph

我们与国家天文台斯巴鲁望远镜合作建设了多目标红外相机和光谱仪（MOIRCS）。MOIRCS在目前8-10米望远镜的近红外相机中具有最宽的视场。视场由最先进的近红外HgCdTe阵列（HAWAII2）以及专用光学系统建立。冷却狭缝掩模的多目标光谱能力是MOIRCS的另一个优势，这是目前仪器尚未建立的。在白天，当观测者想要为他们的天文物体使用任何狭缝模式的配置时，狭缝掩模是可以互换的。在8.2m斯巴鲁望远镜的试验观测过程中，我们证实MOIRCS完全实现了原规格。测试观测是在SSA22领域进行的，其中原始星系团位于z=3.1。利用SupirmCAM的光学档案数据和MOIRCS获得的近红外数据，将光度数据与模型SEDs拟合，得到了星系的光度红移和恒星质量。空间分布在原聚类区域呈现明显的聚类特征。

We have constructed Multi-Object Infrared Camera and Spectrograph (MOIRCS) with the collaboration of Subaru Telescope of National Astronomical Observatory. MOIRCS has a widest field of view among the current near-infrared cameras for 8-10 m telescopes. The field of view is established by the state-of-the-art near-infrared HgCdTe arrays (HAWAII2) along with dedicated optical system. The Capability of the multi-object spectroscopy with cooled slit masks is another advantage of MOIRCS, which has not been established by the current instruments. The slit masks are exchangeable during daytime whenever the observers want to use any configuration of the slit pattern for their astronomical objects. In the course of the test observation with 8.2m Subaru telescope, we have confurned that MOIRCS fully realized the original specifications. The test observations were done in the field of SSA22, where the proto cluster of galaxies is located at z=3.1. Using the optical archive data of SupirmCAM, and near-infrared data obtained by MOIRCS, we obtained the photometric redshift and the stellar mass of the galaxies by fitting the photometric data with the model SEDs. The spatial distributions shows the notable clustering features at the proto-cluster region.