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arXiv 1101.0849astro-ph.CO
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UKIDSS超深调查(UDS)中的星系环境

Galaxy Environments in the UKIDSS Ultra Deep Survey (UDS)

R. W. Chuter, O. Almaini, W. G. Hartley, R. J. McLure, J. S. Dunlop, S. Foucaud, C. J. Conselice, C. Simpson, M. Cirasuolo, E. J. Bradshaw

摘要:

本文基于UKIDSS超深巡天(UDS)中探测到的33,000多个K波段选定星系的样本,对z~2的星系环境进行了研究。UDS中的红外深度和面积的组合使我们能够将以前对星系环境的研究扩展到z>1,而没有与光学星系选择相关的强烈偏差。我们研究的环境中划分的星系静止帧(U-B)的颜色,除了“被动”和“恒星形成”的子集的基础上模板拟合。我们发现,星系的颜色与小尺度(<1 Mpc直径)的星系过密度密切相关,红色/被动星系居住在比蓝色/恒星形成星系更密集的环境中,z~1.5。在更小的尺度上(直径小于0.5Mpc),我们也发现了星系光度与环境之间的关系,z~1处最亮的蓝色星系居住的环境与相同红移的红色被动系统相当。蒙特卡罗模拟表明,这些结论对测光红移误差引入的不确定性是稳健的。

英文摘要:

We present a study of galaxy environments to z~2, based on a sample of over 33,000 K-band selected galaxies detected in the UKIDSS Ultra Deep Survey (UDS). The combination of infrared depth and area in the UDS allows us to extend previous studies of galaxy environment to z>1 without the strong biases associated with optical galaxy selection. We study the environments of galaxies divided by rest frame (U-B) colours, in addition to `passive' and `star-forming' subsets based on template fitting. We find that galaxy colour is strongly correlated with galaxy overdensity on small scales (<1Mpc diameter), with red/passive galaxies residing in significantly denser environments than blue/star-forming galaxies to z~1.5. On smaller scales (<0.5Mpc diameter) we also find a relationship between galaxy luminosity and environment, with the most luminous blue galaxies at z~1 inhabiting environments comparable to red, passive systems at the same redshift. Monte Carlo simulations demonstrate that these conclusions are robust to the uncertainties introduced by photometric redshift errors.

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