ASSEMBLY OF MASSIVE GALAXIES IN A HIGH-z PROTOCLUSTER
ASSEMBLY OF MASSIVE GALAXIES IN A HIGH-z PROTOCLUSTER
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DOI：
10.1088/0004-637x/750/2/116
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发表时间：
2012-03
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通讯作者：
Y. Uchimoto;Toru Yamada;M. Kajisawa;M. Kubo;T. Ichikawa;Y. Matsuda;M. Akiyama;T. Hayashino;M. Konishi;T. Nishimura;K. Omata;R. Suzuki;I. Tanaka;C. Tokoku;T. Yoshikawa
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作者：
Y. Uchimoto;Toru Yamada;M. Kajisawa;M. Kubo;T. Ichikawa;Y. Matsuda;M. Akiyama;T. Hayashino;M. Konishi;T. Nishimura;K. Omata;R. Suzuki;I. Tanaka;C. Tokoku;T. Yoshikawa
我们提出了广泛的领域深JHK成像的SSA 22领域使用MOIRCS仪器配备斯巴鲁望远镜的结果。观测场面积为112 arcmin ~ 2，覆盖了z = 3.1的原星系团，其特征是Lyα发射体（LAEs）和Lyα斑点（LABs）的超密度。5σ极限星等为KAB = 24.3。我们使用多波段光度红移选择以及遥远红星系（DRG; J-KAB> 1.4）的简单色切，从K选择样本中提取潜在的原星系团成员。与空白视野相比，我们观测到的背根节表面数密度有明显的过剩，投影过剩密度为平均值两倍的密集区位置与LAEs的大尺度密度峰值相吻合。75%（15/20）的LABs在Lyα晕中检测到zphot ≥ 3.1的K波段对应物，40%（8/20）的LABs具有多个分量，这直接证明了星系形成过程中的多级多重合并。LABs的恒星质量与其光度、等照度线面积和Lyα速度宽度相关，表明Lyα辐射的物理尺度和动力学运动与LABs以前的星星形成活动密切相关。高度尘埃遮蔽的星系，如超极红天体（J-KAB> 2.1）和亚毫米源的K波段对应物也在高密度区域中存在。
We present the results of wide-field deep JHK imaging of the SSA22 field using the MOIRCS instrument equipped with the Subaru telescope. The observed field is 112 arcmin2 in area, which covers the z = 3.1 protocluster characterized by the overdensities of Lyα emitters (LAEs) and Lyα blobs (LABs). The 5σ limiting magnitude is KAB = 24.3. We extract the potential protocluster members from the K-selected sample by using the multi-band photometric-redshift selection as well as the simple color cut for distant red galaxies (DRGs; J − KAB > 1.4). The surface number density of DRGs in our observed fields shows clear excess compared with those in the blank fields, and the location of the densest area whose projected overdensity is twice the average coincides with the large-scale density peak of LAEs. We also found that K-band counterparts with zphot ≃ 3.1 are detected for 75% (15/20) of the LABs within their Lyα halo, and the 40% (8/20) of LABs have multiple components, which gives a direct evidence of the hierarchical multiple merging in galaxy formation. The stellar mass of LABs correlates with their luminosity, isophotal area, and the Lyα velocity widths, implying that the physical scale and the dynamical motion of Lyα emission are closely related to their previous star formation activities. Highly dust-obscured galaxies such as hyper extremely red objects (J − KAB > 2.1) and plausible K-band counterparts of submillimeter sources are also populated in the high-density region.