Collaborative Research: The Evolution of Dwarf Galaxies -- A Comprehensive View of the Magellanic Clouds

合作研究：矮星系的演化——麦哲伦云的全面观察

• 批准号: 1909497
• 负责人: Steven Majewski
• 金额: $ 34.21万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1909497&HistoricalAwards=false
• 关键词: Collaborative; Research; Evolution; Dwarf; Galaxies

The investigators lead large imaging and spectroscopic surveys of two nearby dwarf galaxies, the Large and Small Magellanic Clouds. While most dwarf galaxies are challenging to study because they are intrinsically faint, the Magellanic Clouds (MCs) are nearby and serve as a unique laboratory to study the structure and dynamics of low-mass galaxies. The investigators will utilize the power of both the imaging Survey of the MAgellanic Stellar History (SMASH) and high-resolution spectroscopy from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) to substantially improve our knowledge of the MCs.The investigators will create large maps of the element abundance patterns and gradients across both MCs. With this combination of observations, they hope to understand the elemental abundance changes over time and space in the MCs by using nuclear reaction models and drawing comparisons to simulations. In addition, the investigators will engage the public in state-of-the art research through a citizen science project called "The APOGEE Spectral Zoo", which will be developed on the Zooniverse platform. Citizens will visually inspect samples of the two million individual APOGEE spectra - including time series spectra on almost all sources - and classify the APOGEE targets, flagging any that appear to have interesting or "abnormal" spectral features that are not currently recognized in the current automated APOGEE spectral analysis pipeline. These citizen scientists will learn many aspects of astronomy, including stars with emission line spectra, time variable objects, double-line spectroscopic binary stars, chemically peculiar stars and cataclysmic variables. The citizens will enhance the research by producing a complementary classification of stars in the survey. The investigator will check the accuracy of the pipeline analysis by comparison with the citizen scientists classifications.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

研究人员对两个附近的矮星系——大麦哲伦星云和小麦哲伦星云进行了大规模成像和光谱调查。 虽然大多数矮星系由于本质上微弱而难以研究，但麦哲伦云 (MC) 就在附近，可以作为研究低质量星系的结构和动力学的独特实验室。 研究人员将利用麦哲伦恒星历史成像调查（SMASH）和阿帕奇点天文台银河演化实验（APOGEE）的高分辨率光谱的力量来大幅提高我们对MC的了解。研究人员将创建大型地图两个 MC 的元素丰度模式和梯度。 通过这种观察组合，他们希望通过使用核反应模型并与模拟进行比较来了解MC中元素丰度随时间和空间的变化。 此外，研究人员将通过一个名为“APOGEE Spectral Zoo”的公民科学项目让公众参与最先进的研究，该项目将在 Zooniverse 平台上开发。公民将目视检查 200 万个单独的 APOGEE 光谱样本（包括几乎所有来源的时间序列光谱），并对 APOGEE 目标进行分类，标记任何似乎具有当前自动化系统中尚未识别的有趣或“异常”光谱特征的目标。 APOGEE 光谱分析管道。这些公民科学家将学习天文学的许多方面，包括具有发射线光谱的恒星、时变天体、双线光谱双星、化学奇特的恒星和灾变变量。公民将通过对调查中的明星进行补充分类来加强研究。 调查人员将通过与公民科学家分类进行比较来检查管道分析的准确性。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

High-velocity Stars in SDSS/APOGEE DR17

SDSS/APOGEE DR17 中的高速恒星

• DOI: 10.3847/1538-3881/ac90bc
• 发表时间: 2022-09-08
• 期刊: The Astronomical Journal
• 作者: F. Quispe;F. Roig;Devin McDonald;V. Loaiza;S. Majewski;Fábio W;erley;erley;K. Cunha;C. Pereira;S. Hasselquist;S. Daflon
• 通讯作者: S. Daflon

APOGEE Chemical Abundance Patterns of the Massive Milky Way Satellites

巨大银河系卫星的 APOGEE 化学丰度模式

• DOI: 10.3847/1538-4357/ac25f9
• 发表时间: 2021-12
• 期刊: The Astrophysical Journal
• 作者: Hasselquist, Sten;Hayes, Christian R.;Lian, Jianhui;Weinberg, David H.;Zasowski, Gail;Horta, Danny;Beaton, Rachael;Feuillet, Diane K.;Garro, Elisa R.;Gallart, Carme;et al
• 通讯作者: et al

The Second Data Release of the Survey of the MAgellanic Stellar History (SMASH)

麦哲伦恒星历史巡天（SMASH）第二次数据发布

• DOI: 10.3847/1538-3881/abceb7
• 发表时间: 2021-02
• 期刊: The Astronomical Journal
• 作者: Nidever, David L.;Olsen, Knut;Choi, Yumi;Ruiz;Miller, Amy E.;Johnson, L. Clifton;Bell, Cameron P.;Blum, Robert D.;Cioni, Maria;Gallart, Carme;et al
• 通讯作者: et al

Elemental Abundances in M31: Iron and Alpha Element Abundances in M31’s Outer Halo

M31 中的元素丰度：M31 外晕中的铁和阿尔法元素丰度

• DOI: 10.3847/1538-3881/ab9602
• 发表时间: 2020-07
• 期刊: The Astronomical Journal
• 作者: Gilbert, Karoline M.;Wojno, Jennifer;Kirby, Evan N.;Escala, Ivanna;Beaton, Rachael L.;Guhathakurta, Puragra;Majewski, Steven R.
• 通讯作者: Majewski, Steven R.

Discovery of an Ultra-faint Stellar System near the Magellanic Clouds with the DECam Local Volume Exploration Survey

通过 DECam 局部体积探测巡天发现麦哲伦星云附近的超微弱恒星系统

• DOI: 10.3847/1538-4357/abe1af
• 发表时间: 2021-03
• 期刊: The Astrophysical Journal
• 作者: Cerny, W.;Pace, A. B.;Drlica;Ferguson, P. S.;Mau, S.;Adamów, M.;Carlin, J. L.;Choi, Y.;Erkal, D.;Johnson, L. C.;et al
• 通讯作者: et al