Z=1.5以来星系演化的E-Spitzer-IMACS红移巡天：I。描述和方法以及更多！
The Carnegie-Spitzer-IMACS Redshift Survey of Galaxy Evolution since z=1.5: I. Description and Methodology and More!
摘要：
我们描述了Magellan-Baade上的Magellan-Spitzer-IMACS（CSI）巡天，一个宽视场的近红外选择性分光光度红移巡天。CSI使用斯皮策IRAC 3.6微米SWIRE场的通量限制星系样本，有效地追踪平均星系的恒星质量z~1.5。本文概述了测光和分光光度法的测量选择、观测和处理。我们还描述了分析的数据：新的方法来拟合合成的SEDs来获得红移，恒星质量，发射线光度，和最近的恒星形成的粗信息。我们独特的方法来分析低色散光谱所采取的多层棱镜在IMACS，结合全色测光从紫外到红外，已经产生了高质量的红移为43,347星系在我们的第一个5.3平方米。SWIRE XMM-LSS字段的degs。一种新的方法来评估数据质量也被描述，三种不同的方法被用来估计我们的红移误差，具有强大的协议。在我们选择的3.6微米通量的整个范围内，我们发现了典型的红移不确定度σ_z/（1+z）< 0.015。在与以前发表的光谱红移的比较中，我们发现在0.7< z< 0.9的星系中sigma_z/（1+z）= 0.011，在0.9< z< 1.2的星系中sigma_z/（1+z）= 0.014。对于比i=23等更亮和更暗的星系，我们分别得到sigma_z/（1+z）= 0.008和sigma_z/（1+z）= 0.022。值得注意的是，我们的低色散光谱和分析产生了红色和蓝色星系的可比红移不确定性和成功率，在很大程度上消除了基于颜色的系统学，这些系统学可能严重偏离星系演化对环境的依赖性。
英文摘要：
We describe the Carnegie-Spitzer-IMACS (CSI) Survey, a wide-field, near-IR selected spectrophotometric redshift survey with IMACS on Magellan-Baade. CSI uses a flux-limited sample of galaxies in Spitzer IRAC 3.6micron imaging of SWIRE fields to efficiently trace the stellar mass of average galaxies to z~1.5. This paper provides an overview of the survey selection, observations, and processing of the photometry and spectrophotometry. We also describe the analysis of the data: new methods of fitting synthetic SEDs are used to derive redshifts, stellar masses, emission line luminosities, and coarse information on recent star-formation. Our unique methodology for analyzing low-dispersion spectra taken with multilayer prisms in IMACS, combined with panchromatic photometry from the ultraviolet to the IR, has yielded high quality redshifts for 43,347 galaxies in our first 5.3 sq. degs of the SWIRE XMM-LSS field. A new approach to assessing data quality is also described, and three different approaches are used to estimate our redshift errors, with robust agreement. Over the full range of 3.6micron fluxes of our selection, we find typical redshift uncertainties of sigma_z/(1+z) < 0.015. In comparisons with previously published spectroscopic redshifts we find scatters of sigma_z/(1+z) = 0.011 for galaxies at 0.7< z< 0.9, and sigma_z/(1+z) = 0.014 for galaxies at 0.9< z< 1.2. For galaxies brighter and fainter than i=23 mag, we find sigma_z/(1+z) = 0.008 and sigma_z/(1+z) = 0.022, respectively. Notably, our low-dispersion spectroscopy and analysis yields comparable redshift uncertainties and success rates for both red and blue galaxies, largely eliminating color-based systematics that can seriously bias observed dependencies of galaxy evolution on environment.
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