论文标题
Z = 3.13的原始群集中大型星系的详细研究
A detailed study of massive galaxies in a protocluster at z=3.13
论文作者
论文摘要
我们介绍了Z = 3.13的原始群集场中近红外选定星系的详细研究。使用可用的MUTLIBENGTEN数据选择原始星系，并在2.9 <z <3.3处使用光度红移（Photo-Z），达到〜10^10 m_sun的质量完整性。在现场发现了多种类型的星系，包括正常的星系星系，静态星系和尘土飞扬的星系星系。 Photo-Z星系在田间形成了两个大型过度结构，在很大程度上与先前鉴定的星系过度密切相关，分别由Lyα发射器（LAES）和Lyman Break Galaxies（LBGS）重叠。北部的过度密度由大量的旧和/或尘土飞扬的星系种群组成，而南部的人群主要由正常的星形星系组成，这些星系在空间上与LAES相关。这与我们先前的研究一致，认为不同星系过重的空间抵消可能是由于光环组装偏见所致。鉴于这两个过度的端到端尺寸较大，一种可能性是它们将在当今的超级群中形成。我们还发现有力的证据表明，与田间相比，高密度原始群集区域中星系的恒星形成活性得到了增强，这表明该原始群集中的加速质量组装。
We present a detailed study of Near-IR selected galaxies in a protocluster field at z = 3.13. Protocluster galaxies are selected using the available mutliwavelength data with the photometric redshift (photo-z) at 2.9 < z < 3.3, reaching a mass completeness of ~10^10 M_sun. Diverse types of galaxies have been found in the field including normal star-forming galaxies, quiescent galaxies and dusty star-forming galaxies. The photo-z galaxies form two large overdense structures in the field, largely overlapping with the previously identified galaxy overdensities traced by Lyα emitters (LAEs) and Lyman break galaxies (LBGs) respectively. The northern overdensity consists of a large fraction of old and/or dusty galaxy populations, while the southern one is mainly composed of normal star-forming galaxies which are spatially correlated with the LAEs. This agrees with our previous study arguing the spatial offset of different galaxy overdensities may be due to halo assembly bias. Given the large end-to-end sizes of the two overdensities, one possibility is that they will form into a supercluster by the present day. We also find strong evidence that the star-formation activities of the galaxies in the overdense protocluster regions are enhanced in comparison to their field counterparts, which suggests an accelerated mass assembly in this protocluster.
