arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1607.08613astro-ph.GA
收藏

SDSS-IV MaNGA IFS银河调查-调查设计、执行和初始数据质量

SDSS-IV MaNGA IFS Galaxy Survey --- Survey Design, Execution, and Initial Data Quality

Renbin Yan, Kevin Bundy, David R. Law, Matthew A. Bershady, Brett Andrews, Brian Cherinka, Aleksandar M. Diamond-Stanic, Niv Drory, Nicholas MacDonald, José R. … 展开作者

Renbin Yan, Kevin Bundy, David R. Law, Matthew A. Bershady, Brett Andrews, Brian Cherinka, Aleksandar M. Diamond-Stanic, Niv Drory, Nicholas MacDonald, José R. Sánchez-Gallego, Daniel Thomas, David A. Wake, Anne-Marie Weijmans, Kyle B. Westfall, Kai Zhang, Alfonso Aragón-Salamanca, Francesco Belfiore, Dmitry Bizyaev, Guillermo A. Blanc, Michael R. Blanton, Joel Brownstein, Michele Cappellari, Richard D'Souza, Eric Emsellem, Hai Fu, Patrick Gaulme, Mark T. Graham, Daniel Goddard, James E. Gunn, Paul Harding, Amy Jones, Karen Kinemuchi, Cheng Li, Hongyu Li, Roberto Maiolino, Shude Mao, Claudia Maraston, Karen Masters, Michael R. Merrifield, Daniel Oravetz, Kaike Pan, John K. Parejko, Sebastian F. Sanchez, David Schlegel, Audrey Simmons, Karun Thanjavur, Jeremy Tinker, Christy Tremonti, Remco van den Bosch, Zheng Zheng

摘要:

MaNGA巡天(Mapping Nearby Galeries at Apache Point Observatory)是斯隆数字巡天IV的三个核心项目之一。它正在获得10 K附近星系的积分场光谱,光谱分辨率为R~2000,从3,622 - 10,354 A。调查的设计是由一套科学要求的精度估计以下属性:恒星形成率表面密度,气体金属,恒星星族年龄,金属,丰度比,和他们的梯度;恒星和气体运动学;和封闭的引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的深度,并决定样本的选择。选择大多数目标星系是为了确保以有效半径(Re)为单位的均匀空间覆盖,同时最大限度地提高空间分辨率。约2/3的样品被1.5Re覆盖(初级样品),1/3的样品被2.5Re覆盖(次级样品)。我们描述了调查执行的细节,这将是有用的设计类似的未来调查。我们还提出了所取得的数据质量的统计,特别是,点扩散函数,采样均匀性,光谱分辨率,天空减法,和通量校准。对于我们的原始样本,对于1-1.5 Re之间堆叠的光谱,中值r波段信噪比为每1.4 A像素约73。从第一年的数据中对各种星系属性的测量表明,我们正在满足或超过我们大多数科学目标的定义要求。

英文摘要:

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 3,622-10,354A. 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 1.4A 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑