The southern stellar stream spectroscopic survey (S5): Overview, target selection, data reduction, validation, and early science
The southern stellar stream spectroscopic survey (S5): Overview, target selection, data reduction, validation, and early science
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DOI：
10.1093/mnras/stz2731
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发表时间：
2019-07
影响因子：
4.8
通讯作者：
T. Li;Sergey E. Koposov;D. Zucker;G. Lewis;K. Kuehn;J. Simpson;A. Ji;N. Shipp;Y. Mao
中科院分区：
文献类型：
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作者：
T. Li;Sergey E. Koposov;D. Zucker;G. Lewis;K. Kuehn;J. Simpson;A. Ji;N. Shipp;Y. Mao
我们介绍了南部恒星流光谱调查（S5），一个正在进行的计划，以映射在南半球的恒星流的运动学和化学。S5最初的重点是对暗能量调查（DES）足迹内最近确定的流进行光谱观测，最终目标是调查整个南部天空的流。恒星流是由从矮星系和球状星团中被潮汐剥离的物质组成的，因此是银河系引力势的优秀动力学探测器，并提供了其吸积历史的详细快照。观察与3.9米英澳望远镜的2度场光纤定位器和AAOmega摄谱仪，并结合精确的测光DES DR 1与高超的自行盖亚DR 2，使我们能够进行有效的光谱调查，以映射这些恒星流。到目前为止，S5已经绘制了9个DES流和DES之外的3个流;前者是这些最近发现的流的第一次光谱观测。除了流调查，我们使用备用光纤进行银河系晕调查和低红移星系调查。本文概述了S5计划，描述了调查的科学动机，目标选择，观测策略，数据简化和调查验证。最后，我们描述了早期的科学成果恒星流和银河系晕星从调查得出。S5的更新，包括未来的公开数据发布，可以在http://s5collab.github.io上找到。
We introduce the southern stellar stream spectroscopy survey (S5), an on-going program to map the kinematics and chemistry of stellar streams in the southern hemisphere. The initial focus of S5 has been spectroscopic observations of recently identified streams within the footprint of the dark energy survey (DES), with the eventual goal of surveying streams across the entire southern sky. Stellar streams are composed of material that has been tidally striped from dwarf galaxies and globular clusters and hence are excellent dynamical probes of the gravitational potential of the Milky Way, as well as providing a detailed snapshot of its accretion history. Observing with the 3.9 m Anglo-Australian Telescope’s 2-degree-Field fibre positioner and AAOmega spectrograph, and combining the precise photometry of DES DR1 with the superb proper motions from Gaia DR2, allows us to conduct an efficient spectroscopic survey to map these stellar streams. So far S5 has mapped nine DES streams and three streams outside of DES; the former are the first spectroscopic observations of these recently discovered streams. In addition to the stream survey, we use spare fibres to undertake a Milky Way halo survey and a low-redshift galaxy survey. This paper presents an overview of the S5 program, describing the scientific motivation for the survey, target selection, observation strategy, data reduction, and survey validation. Finally, we describe early science results on stellar streams and Milky Way halo stars drawn from the survey. Updates on S5, including future public data releases, can be found at http://s5collab.github.io.