Final Targeting Strategy for the Sloan Digital Sky Survey IV Apache Point Observatory Galactic Evolution Experiment 2 North Survey
Final Targeting Strategy for the Sloan Digital Sky Survey IV Apache Point Observatory Galactic Evolution Experiment 2 North Survey
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DOI：
10.3847/1538-3881/ac260c
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
R. Beaton;R. Oelkers;C. Hayes;K. Covey;S. Chojnowski;Nathan De Lee;J. Sobeck;S. Majewski;
中科院分区：
文献类型：
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作者：
R. Beaton;R. Oelkers;C. Hayes;K. Covey;S. Chojnowski;Nathan De Lee;J. Sobeck;S. Majewski;
阿帕奇点天文台银河演化实验2号（APOGEE-2）是一项双半球近红外光谱调查，目标是绘制银河系的化学动力学图。APOGEE-2的目标是复杂的，并且随着时间的推移而发展。在本文中，我们对Zasowski等人（2017）提出的APOGEE-2N初始靶向策略进行了更新和补充。这些修改有两种实施模式：(i)通过2015年和2017年的提案呼吁，竞争性地授予斯隆数字巡天IV pi“辅助科学计划”，以追求主巡天之外的新科学途径；（ii）通过APOGEE-2N项目第一年的效率增益，将巡天有效扩展1.5年，称为“明亮时间延长（BTX）”。对于23个不同的辅助项目，我们提供了科学目标、目标选择以及如何在APOGEE-2样本中识别这些目标的描述。BTX允许改变主要的调查策略，包括新项目以响应科学发现或利用在调查设计之初无法获得的主要新数据集，以及扩展现有项目以提高其科学成就和范围。在描述了这些项目的动机、实施和评估之后，我们也总结了近十年来APOGEE-1和APOGEE-2调查行动的经验教训。F. Santana等人的配套论文（提交；AAS29036）提供了与APOGEE-2在南半球的操作相关的靶向修改的补充介绍。
The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is a dual-hemisphere, near-infrared (NIR), spectroscopic survey with the goal of producing a chemodynamical mapping of the Milky Way. The targeting for APOGEE-2 is complex and has evolved with time. In this paper, we present the updates and additions to the initial targeting strategy for APOGEE-2N presented in Zasowski et al. (2017). These modifications come in two implementation modes: (i) “Ancillary Science Programs” competitively awarded to Sloan Digital Sky Survey IV PIs through proposal calls in 2015 and 2017 for the pursuit of new scientific avenues outside the main survey, and (ii) an effective 1.5 yr expansion of the survey, known as the Bright Time Extension (BTX), made possible through accrued efficiency gains over the first years of the APOGEE-2N project. For the 23 distinct ancillary programs, we provide descriptions of the scientific aims, target selection, and how to identify these targets within the APOGEE-2 sample. The BTX permitted changes to the main survey strategy, the inclusion of new programs in response to scientific discoveries or to exploit major new data sets not available at the outset of the survey design, and expansions of existing programs to enhance their scientific success and reach. After describing the motivations, implementation, and assessment of these programs, we also leave a summary of lessons learned from nearly a decade of APOGEE-1 and APOGEE-2 survey operations. A companion paper, F. Santana et al. (submitted; AAS29036), provides a complementary presentation of targeting modifications relevant to APOGEE-2 operations in the Southern Hemisphere.