EDGE-CALIFA巡天：126个Galerkin与CARMA的干涉测量观测
The EDGE-CALIFA Survey: Interferometric Observations of 126 Galaxies with CARMA
摘要：
我们目前的干涉CO观测与毫米波天文组合阵列（CARMA）的星系从银河系外星系演化调查数据库（EDGE）。这些星系是从Calar Alto Legacy Integral Field Area（CALIFA）样本中选择的，用光学积分场光谱绘制。EDGE提供了126个星系的高质量CO数据（3 $σ$灵敏度$Σ_{\rm mol}$ $\sim$ 11 M $_\odot$ pc $^{-2}$（倾角校正前），分辨率$\sim1.4$ kpc），构成了附近宇宙中最大的星系CO干涉测量。我们描述了调查，数据特征，数据产品，并提出了初步的科学结果。我们发现，分子，恒星和恒星形成的磁盘的指数尺度长度是近似相等的，和星系更紧凑的分子气体比在恒星往往显示出相互作用的迹象。我们表征的分子恒星比作为哈勃类型和恒星质量的函数，目前的初步结果解决分子气体，恒星和恒星形成率之间的关系，并讨论了解决分子耗尽时间对恒星表面密度，星云消光和气体金属丰度的依赖关系。EDGE提供了一个关键的数据集，以解决有关气体及其在恒星形成和星系演化中的作用的突出主题，这些数据集将在质量评估完成后公开提供。
英文摘要：
We present interferometric CO observations made with the Combined Array for Millimeter-wave Astronomy (CARMA) of galaxies from the Extragalactic Database for Galaxy Evolution survey (EDGE). These galaxies are selected from the Calar Alto Legacy Integral Field Area (CALIFA) sample, mapped with optical integral field spectroscopy. EDGE provides good quality CO data (3$σ$ sensitivity $Σ_{\rm mol}$ $\sim$ 11 M$_\odot$ pc$^{-2}$ before inclination correction, resolution $\sim1.4$ kpc) for 126 galaxies, constituting the largest interferometric CO survey of galaxies in the nearby universe. We describe the survey, the data characteristics, the data products, and present initial science results. We find that the exponential scale-lengths of the molecular, stellar, and star-forming disks are approximately equal, and galaxies that are more compact in molecular gas than in stars tend to show signs of interaction. We characterize the molecular to stellar ratio as a function of Hubble type and stellar mass, present preliminary results on the resolved relations between the molecular gas, stars, and star formation rate, and discuss the dependence of the resolved molecular depletion time on stellar surface density, nebular extinction, and gas metallicity. EDGE provides a key dataset to address outstanding topics regarding gas and its role in star formation and galaxy evolution, which will be publicly available on completion of the quality assessment.
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