Subaru/MOIRCS在z=3.1的原星系团区域的近红外成像
Subaru/MOIRCS Near-Infrared Imaging in the Proto-Cluster Region at z=3.1
摘要：
我们提出的Z=3.1原星系团区域的深近红外成像观测的结果，在SSA 22 a领域所采取的MOIRCS安装在斯巴鲁望远镜。我们在J=24.5、H=24.3和K=23.9（5 σ）的深度观测到了21.7弧分^[2]的磁场。本文利用遥远红星系简单色切和光度红移选择技术研究了z~3处K选择星系的分布。在两个最明亮的Ly α斑点（LAB）周围发现了DRG和photo-z选择对象的边缘密度过剩。我们研究了K-选择天体与LABs之间的相关性，发现LABs附近，特别是两个最亮的LABs附近，存在着几个恒星质量M * = 10^9-10^11 Msolar的星系。我们还发现8个LAB中有7个可能存在K_s波段的对应物，并且可能与LAB相关的恒星质量之和与它们的光度和表面亮度相关，这意味着Ly α发射的起源可能与它们的恒星质量或它们以前的恒星形成现象密切相关。
英文摘要：
We present the results of deep near-infrared imaging observations of the z=3.1 proto-cluster region in the SSA22a field taken by MOIRCS mounted on the Subaru Telescope. We observed a 21.7 arcmin^2 field to the depths of J=24.5, H=24.3, and K=23.9 (5 sigma). We examine the distribution of the K-selected galaxies at z~3 by using the simple color cut for distant red galaxies (DRGs) as well as the photometric-redshift selection technique. The marginal density excess of DRGs and the photo-z selected objects are found around the two most luminous Ly alpha blobs (LABs). We investigate the correlation between the K-selected objects and the LABs, and find that several galaxies with stellar mass M_* = 10^9-10^11 M_solar exist in vicinity of LABs, especially around the two most luminous ones. We also find that 7 of the 8 LABs in the field have plausible K_s-band counterparts and the sum of the stellar mass possibly associated with LABs correlates with the luminosity and surface brightness of them, which implies that the origin of Ly alpha emission may be closely correlated with their stellar mass or their previous star formation phenomena.
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