PHANGS–ALMA: Arcsecond CO(2–1) Imaging of Nearby Star-forming Galaxies
PHANGS–ALMA: Arcsecond CO(2–1) Imaging of Nearby Star-forming Galaxies
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DOI：
10.3847/1538-4365/ac17f3
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
A. Leroy;E. Schinnerer;A. Hughes;E. Rosolowsky;J. Pety;A. Schruba;A. Usero;G. Blanc;M. Chevance-M.-Che
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文献类型：
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作者：
A. Leroy;E. Schinnerer;A. Hughes;E. Rosolowsky;J. Pety;A. Schruba;A. Usero;G. Blanc;M. Chevance-M.-Che
我们提出PHANGS ALMA，第一次调查映射CO J = 2 → 1线发射在100 pc的空间分辨率从90个附近的代表性样本（d = 20 Mpc）星系，位于或附近的z = 0“主序星”的恒星形成星系。CO谱线的发射追踪了分子气体的整体分布，这是星际介质中寒冷的恒星形成阶段。在PHANGS-ALMA所达到的分辨率下，每个光束都达到了典型的单个巨型分子云的大小，因此这些数据可以用于测量大多数恒星在z = 0时形成的星系群中分子云的人口统计学，生命周期和物理状态。本文介绍了调查的科学动机和背景，样本选择，全球属性的目标，阿塔卡马大型毫米/亚毫米阵列（阿尔马）的观测，以及交付的数据和衍生数据产品的特点。由于阿尔马样本作为与MUSE在甚大望远镜、哈勃太空望远镜、AstroSat、甚大阵列和其他设施上进行平行调查的母样本，我们对样本选择进行了详细讨论。我们详细的估计星系的质量，大小，星星形成率，CO光度，和其他属性，比较估计使用不同的系统，并提供最佳估计的综合测量每个目标。我们还报告了阿尔马观测的设计和执行，它结合了联合收割机第5周期的大型程序，一系列较小的程序，和档案观测。最后，我们给出了第一个1″分辨率的邻近星系CO辐射图集，并描述了第一个PHANGS-ALMA公开数据发布的性质和内容。
We present PHANGS–ALMA, the first survey to map CO J = 2 → 1 line emission at ∼1″ ∼100 pc spatial resolution from a representative sample of 90 nearby (d ≲ 20 Mpc) galaxies that lie on or near the z = 0 “main sequence” of star-forming galaxies. CO line emission traces the bulk distribution of molecular gas, which is the cold, star-forming phase of the interstellar medium. At the resolution achieved by PHANGS–ALMA, each beam reaches the size of a typical individual giant molecular cloud, so that these data can be used to measure the demographics, life cycle, and physical state of molecular clouds across the population of galaxies where the majority of stars form at z = 0. This paper describes the scientific motivation and background for the survey, sample selection, global properties of the targets, Atacama Large Millimeter/submillimeter Array (ALMA) observations, and characteristics of the delivered data and derived data products. As the ALMA sample serves as the parent sample for parallel surveys with MUSE on the Very Large Telescope, the Hubble Space Telescope, AstroSat, the Very Large Array, and other facilities, we include a detailed discussion of the sample selection. We detail the estimation of galaxy mass, size, star formation rate, CO luminosity, and other properties, compare estimates using different systems and provide best-estimate integrated measurements for each target. We also report the design and execution of the ALMA observations, which combine a Cycle 5 Large Program, a series of smaller programs, and archival observations. Finally, we present the first 1″ resolution atlas of CO emission from nearby galaxies and describe the properties and contents of the first PHANGS–ALMA public data release.