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arXiv 0910.1836astro-ph.CO
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远红外镓的光谱研究

Optical Spectroscopy of Distant Red Galaxies

Stijn Wuyts, Pieter G. van Dokkum, Marijn Franx, Natascha M. Forster Schreiber, Garth D. Illingworth, Ivo Labbe, Gregory Rudnick

摘要:

我们提出了一个遥远的红色Galeros(DRG)的样本的光学光谱后续与K < 22.5(织女星),选择J-K > 2.3,在哈勃深场南,MS 1054-03领域,和钱德拉深场南。获得了15个DRG的光谱红移。15个DRG中只有2个位于z < 2,表明选择高红移源的效率很高。从其他光谱调查中的CDFS目标中间到高红移人口选择不同的标准,我们发现光谱红移的另外30个DRG。我们使用光谱学证实的DRG样本来确定其在所考虑的深场中的高质量(Δz/(1+z)的散射约为0.05)的光度红移,如EAZY(Brammer等人,2008)所推导的那样。结合光谱和光度红移,我们发现,74%的背根神经节与< 22.5 lie at z >K2。组合的光谱和光度样品被用来分析在z 2的背根神经节的独特的内在和观察到的属性< 2 and z >。在K &lt; 22.5的光度样本中,低红移DRG在K中比高红移DRG亮0.7等,在Av中比高红移DRG亮1.2等。我们的分析表明,DRG标准选择不同的性质在不同的红移星系。这种偏差可以通过基于静止坐标系特性选择星系来避免,这需要非常好的多波段测光和高质量的测光红移。

英文摘要:

We present optical spectroscopic follow-up of a sample of Distant Red Galaxies (DRGs) with K < 22.5 (Vega), selected by J-K > 2.3, in the Hubble Deep Field South, the MS 1054-03 field, and the Chandra Deep Field South. Spectroscopic redshifts were obtained for 15 DRGs. Only 2 out of 15 DRGs are located at z < 2, suggesting a high efficiency to select high-redshift sources. From other spectroscopic surveys in the CDFS targeting intermediate to high redshift populations selected with different criteria, we find spectroscopic redshifts for a further 30 DRGs. We use the sample of spectroscopically confirmed DRGs to establish the high quality (scatter in Δz/(1+z) of ~ 0.05) of their photometric redshifts in the considered deep fields, as derived with EAZY (Brammer et al. 2008). Combining the spectroscopic and photometric redshifts, we find that 74% of DRGs with K < 22.5 lie at z > 2. The combined spectroscopic and photometric sample is used to analyze the distinct intrinsic and observed properties of DRGs at z < 2 and z > 2. In our photometric sample to K < 22.5, low-redshift DRGs are brighter in K than high-redshift DRGs by 0.7 mag, and more extincted by 1.2 mag in Av. Our analysis shows that the DRG criterion selects galaxies with different properties at different redshifts. Such biases can be largely avoided by selecting galaxies based on their rest-frame properties, which requires very good multi-band photometry and high quality photometric redshifts.

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