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arXiv 1002.4198astro-ph.CO
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z~3.1射电选择原星系团的星系布居研究

A galaxy populations study of a radio-selected protocluster at z~3.1

E. Kuiper, N. A. Hatch, H. J. A. Rottgering, G. K. Miley, R. A. Overzier, B. P. Venemans, C. de Breuck, S. Croft, M. Kajisawa, T. Kodama, J. D. Kurk, L. Penteri… 展开作者

E. Kuiper, N. A. Hatch, H. J. A. Rottgering, G. K. Miley, R. A. Overzier, B. P. Venemans, C. de Breuck, S. Croft, M. Kajisawa, T. Kodama, J. D. Kurk, L. Pentericci, S. A. Stanford, I. Tanaka, A. W. Zirm

摘要:

本文对射电星系MRC 0316 -257周围z~3.1的原星系团中的几种类型的星系进行了星族研究。除了已知的人口的Ly_alpha发射体(LAEs)和[OIII]发射体,我们使用颜色选择技术来确定原星系团候选人是莱曼break星系(LBG)和巴尔末break星系(BBG)。射电星系场包含了过量的LBG候选者,表面密度为1.6 \pm 0.3倍,比空白场大。该表面过密度对应于~8 \pm 4的LBG体积过密度。BBG测光红移分布的峰值在原星系团的红移,但我们没有检测到显着的表面超密度的BBG。这并不奇怪,因为类似于LBG的体积过密度将导致在空白区域中发现的~1.2的表面密度。在我们的样本中无法检测到。用SED拟合方法计算了候选原团星系的质量和恒星形成率。这些性质与场星系没有显著的不同。质量和恒星形成率最高的星系位于射电星系附近,表明原星系团环境影响z~3处的星系演化。我们的结论是,在MRC 0316 -257周围的原星团仍处于形成的早期阶段。

英文摘要:

We present a population study of several types of galaxies within the protocluster surrounding the radio galaxy MRC0316-257 at z~3.1. In addition to the known population of Ly_alpha emitters (LAEs) and [OIII] emitters, we use colour selection techniques to identify protocluster candidates that are Lyman break galaxies (LBG) and Balmer break galaxies (BBGs). The radio galaxy field contains an excess of LBG candidates, with a surface density 1.6\pm0.3 times larger than found for comparable blank fields. This surface overdensity corresponds to an LBG volume overdensity of ~8\pm4. The BBG photometric redshift distribution peaks at the protocluster's redshift, but we detect no significant surface overdensity of BBG. This is not surprising because a volume overdensity similar to the LBGs would have resulted in a surface density of ~1.2 that found in the blank field. This could not have been detected in our sample. Masses and star formation rates of the candidate protocluster galaxies are determined using SED fitting. These properties are not significantly different from those of field galaxies. The galaxies with the highest masses and star formation rates are located near the radio galaxy, indicating that the protocluster environment influences galaxy evolution at z~3. We conclude that the protocluster around MRC0316-257 is still in the early stages of formation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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