OVERVIEW OF THE SDSS-IV MaNGA SURVEY: MAPPING NEARBY GALAXIES AT APACHE POINT OBSERVATORY
OVERVIEW OF THE SDSS-IV MaNGA SURVEY: MAPPING NEARBY GALAXIES AT APACHE POINT OBSERVATORY
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DOI：
10.1088/0004-637x/798/1/7
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发表时间：
2015-01-01
影响因子：
4.9
通讯作者：
Zhang, Kai
中科院分区：
文献类型：
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作者：
Bundy, Kevin;Bershady, Matthew A.;Zhang, Kai
我们提出了一个新的积分场光谱调查称为MANGA（映射附近Galerkin在阿帕奇点天文台）的概述，在第四代斯隆数字巡天（SDSS-IV）的三个核心计划之一，开始于2014年7月1日。MaNGA将在10，000个附近星系的前所未有的样本中研究气体和恒星的内部运动学结构和组成。我们总结的仪器和调查设计的背景下，MANGA的关键科学目标的基本特征，并提出原型观测，以证明MANGA的科学潜力。MaNGA采用17个纤维束积分场单元的抖动观测，其直径从12 "（19根纤维）到32"（127根纤维）不等。两个双通道摄谱仪提供同时波长覆盖超过3600 - 10300埃在R类似于2000。在典型的3小时积分时间下，MaNGA在23 AB mag arcsec（-2）时达到了4 - 8（每2 "光纤埃（-1））的目标r波段信噪比，这是MaNGA星系外围的典型情况。选择目标的M * 大于或接近10（9）M圆点，使用SDSS-I红移和i波段光度，以实现有效半径方面的均匀径向覆盖，恒星质量的近似平坦分布，以及跨越广泛环境的样本。我们的原型观测分析表明，MANGA的探测气体电离的能力，揭示了最近的星星的形成和淬火，使动力学建模，分解组成成分，并绘制恒星种群的组成。MaNGA的空间分辨光谱将在未来6年内对附近星系的天体物理学进行前所未有的研究。
We present an overview of a new integral field spectroscopic survey called MaNGA (Mapping Nearby Galaxies at Apache Point Observatory), one of three core programs in the fourth-generation Sloan Digital Sky Survey (SDSS-IV) that began on 2014 July 1. MaNGA will investigate the internal kinematic structure and composition of gas and stars in an unprecedented sample of 10,000 nearby galaxies. We summarize essential characteristics of the instrument and survey design in the context of MaNGA's key science goals and present prototype observations to demonstrate MaNGA's scientific potential. MaNGA employs dithered observations with 17 fiber-bundle integral field units that vary in diameter from 12 '' (19 fibers) to 32 '' (127 fibers). Two dual-channel spectrographs provide simultaneous wavelength coverage over 3600-10300 angstrom at R similar to 2000. With a typical integration time of 3 hr, MaNGA reaches a target r-band signal-to-noise ratio of 4-8 (angstrom(-1) per 2 '' fiber) at 23 AB mag arcsec(-2), which is typical for the outskirts of MaNGA galaxies. Targets are selected with M* greater than or similar to 10(9) M-circle dot using SDSS-I redshifts and i-band luminosity to achieve uniform radial coverage in terms of the effective radius, an approximately flat distribution in stellar mass, and a sample spanning a wide range of environments. Analysis of our prototype observations demonstrates MaNGA's ability to probe gas ionization, shed light on recent star formation and quenching, enable dynamical modeling, decompose constituent components, and map the composition of stellar populations. MaNGA's spatially resolved spectra will enable an unprecedented study of the astrophysics of nearby galaxies in the coming 6 yr.