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SDSS-IV MaNGA IFS Galaxy Survey - survey design, execution, and initial data quality

机译:SDSS-IV MaNGA IFS银河调查-调查设计,执行和初始数据质量

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摘要

The MaNGA Survey (Mapping Nearby Galaxies at Apache Point Observatory) is one of three core programs in the Sloan Digital Sky Survey IV. It is obtaining integral field spectroscopy (IFS) for 10K nearby galaxies at a spectral resolution of R~2000 from 3,622-10,354Å. The design of the survey is driven by a set of science requirements on the precision of estimates of the following properties: star formation rate surface density, gas metallicity, stellar population age, metallicity, and abundance ratio, and their gradients; stellar and gas kinematics; and enclosed gravitational mass as a function of radius. We describe how these science requirements set the depth of the observations and dictate sample selection. The majority of targeted galaxies are selected to ensure uniform spatial coverage in units of effective radius (Re) while maximizing spatial resolution. About 2/3 of the sample is covered out to 1.5Re (Primary sample), and 1/3 of the sample is covered to 2.5Re (Secondary sample). We describe the survey execution with details that would be useful in the design of similar future surveys. We also present statistics on the achieved data quality, specifically, the point spread function, sampling uniformity, spectral resolution, sky subtraction, and flux calibration. For our Primary sample, the median r-band signal-to-noise ratio is ~73 per 1.4Å pixel for spectra stacked between 1-1.5 Re. Measurements of various galaxy properties from the first year data show that we are meeting or exceeding the defined requirements for the majority of our science goals.
机译:MaNGA调查(在Apache Point天文台测绘附近的星系)是Sloan Digital Sky Survey IV中的三个核心程序之一。它正在以3,622-10,354Å的R〜2000的光谱分辨率获得10K附近星系的积分场光谱(IFS)。这项调查的设计受到一组科学要求的驱动,这些科学要求涉及以下性质的估算精度:恒星形成率表面密度,气体金属度,恒星年龄,金属度和丰度比及其梯度;恒星和气体运动学;和封闭的重力质量作为半径的函数。我们描述了这些科学要求如何设置观察深度并指示样本选择。选择大多数目标星系以确保以有效半径(Re)为单位的均匀空间覆盖,同时最大化空间分辨率。大约2/3的样本覆盖到1.5Re(原始样本),而1/3的样本覆盖到2.5Re(二次样本)。我们用详细的描述来描述调查的执行,这些细节在设计类似的未来调查时将很有用。我们还提供了有关获得的数据质量的统计数据,特别是点扩展函数,采样均匀性,光谱分辨率,天空减法和通量校准。对于我们的主要样品,对于1-1.5 Re之间堆叠的光谱,r波段的信噪比中位数为每1.4Å像素〜73。从第一年的数据对各种星系特性的测量表明,我们达到或超过了大多数科学目标的既定要求。

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