Collaborative Research: Dark Matter and Substructure in the Galactic Halo with Gaia and Multi-Object Spectroscopy

合作研究：利用盖亚和多目标光谱学研究银河晕中的暗物质和亚结构

• 批准号: 1813881
• 负责人: Matthew Walker
• 金额: $ 58.6万
• 依托单位: Carnegie-Mellon University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1813881&HistoricalAwards=false
• 关键词: Collaborative; Research; Dark; Matter; Substructure

The Galactic Halo encompasses the vast, seemingly empty volume surrounding our home galaxy, the Milky Way. But the Halo is not so empty as it appears. A rich variety of dwarf galaxies, stellar streams and star clusters pervade the Halo. These structures can reveal the nature of dark matter, how heavy elements are made, and how our Galaxy formed. This project advances the field by combining data from large public sky surveys with new data to be obtained with state-of-the art ground-based facilities. This project aims to identify new stellar structures, then probe their chemistry and dynamics. The results will test competing models of dark matter and galaxy formation. This project builds on previous NSF investments in instrumentation and the scientific workforce. The team will continue to operate the NSF-funded Michigan/Magellan Fiber System (M2FS) spectrograph, enabling innovative science by other astronomers. These activities promote science by continuing successful public outreach programs and training the next generation of astronomers.The primary scientific objectives include 1) the detection of faint and previously unknown star clusters, dwarf galaxies, and stellar streams within the Milky Way halo; 2) measurement of the velocities and chemical compositions of the stars within these structures; and 3) mapping the dark matter content of these structures. To discover new objects, the team will mine data from the Gaia space mission, exploiting its unprecedented combination of sky coverage, precision of stellar positions, and measurement of stellar motions. The team will use Gaia data to identify not only new stellar structures, but also rare stars within known structures. For all such targets, the team will use the M2FS spectrograph to measure stellar velocities and chemical composition. Finally, the team will combine the Gaia and M2FS data sets, exploiting the multi-dimensional information to infer the dark matter content and chemical evolution of these structures. These results will advance the frontiers of knowledge regarding the nature of dark matter, the origin of heavy elements, the formation and evolution of the smallest galaxies, and the processes that built up the stellar halo of our own Milky Way.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.

银河晕环绕着我们的家园银河系周围巨大而看似空旷的空间。但光环并不像看起来那么空洞。丰富多样的矮星系、恒星流和星团遍布光晕。这些结构可以揭示暗物质的本质，重元素是如何形成的，以及我们的银河系是如何形成的。该项目通过将大型公共天空调查数据与最先进的地面设施获得的新数据相结合，推进了该领域的发展。这个项目旨在确定新的恒星结构，然后探索它们的化学和动力学。研究结果将检验暗物质和星系形成的相互竞争的模型。该项目建立在NSF之前在仪器和科学劳动力方面的投资基础上。该团队将继续运行由美国国家科学基金会资助的密歇根/麦哲伦光纤系统（M2FS）光谱仪，使其他天文学家能够创新科学。这些活动通过继续成功的公众宣传计划和培训下一代天文学家来促进科学。主要的科学目标包括：1)探测银河系晕内微弱的和以前未知的星团、矮星系和恒星流；2)测量这些结构内恒星的速度和化学成分；3)绘制这些结构的暗物质含量。为了发现新的天体，该团队将从盖亚太空任务中挖掘数据，利用其前所未有的天空覆盖范围、恒星位置精度和恒星运动测量的组合。该团队将利用盖亚数据不仅识别新的恒星结构，还将识别已知结构内的罕见恒星。对于所有这样的目标，研究小组将使用M2FS光谱仪来测量恒星的速度和化学成分。最后，该团队将结合盖亚和M2FS的数据集，利用多维信息来推断暗物质的含量和这些结构的化学演化。这些结果将推动有关暗物质的本质、重元素的起源、最小星系的形成和演化以及银河系恒星光环形成过程的知识前沿。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识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

Binary deviations from single object astrometry

• DOI: 10.1093/mnras/staa1148
• 发表时间: 2020-03
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Z. Penoyre;V. Belokurov;N. Evans;A. Everall;Sergey E. Koposov

Measuring the Mass of the Large Magellanic Cloud with Stellar Streams Observed by S 5

• DOI: 10.3847/1538-4357/ac2e93
• 发表时间: 2021-07
• 期刊: The Astrophysical Journal
• 作者: N. Shipp;D. Erkal;A. Drlica-Wagner;Ting S. Li;A. Pace;Sergey E. Koposov;L. Cullinane;G. Costa;A. Ji;K. Kuehn;G. Lewis;D. Mackey;J. Simpson;Z. Wan;D. Zucker;J. Bland-Hawthorn;P. Ferguson;Sophia Lilleengen;Sdss Collaboration

The Binary Fraction of Stars in Dwarf Galaxies: The Cases of Draco and Ursa Minor

矮星系中恒星的双星分数：天龙座和小熊座的例子

• DOI: 10.3847/1538-3881/aae3e4
• 发表时间: 2018
• 期刊: The Astronomical Journal
• 作者: Spencer, Meghin E.;Mateo, Mario;Olszewski, Edward W.;Walker, Matthew G.;McConnachie, Alan W.;Kirby, Evan N.
• 通讯作者: Kirby, Evan N.

Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III

• DOI: 10.3847/1538-4357/ab6213
• 发表时间: 2019-12
• 期刊: The Astrophysical Journal
• 作者: A. Ji;Ting S. Li;J. Simon;J. Marshall;K. Vivas;A. Pace;K. Bechtol;A. Drlica-Wagner;Sergey E.

The Gaia-ESO Survey: asymmetric expansion of the Lagoon Nebula cluster NGC 6530 from GES and Gaia DR2

• DOI: 10.1093/mnras/stz870
• 发表时间: 2019-03
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: N. Wright;R. Jeffries;R. Jackson;A. Bayo;R. Bonito;F. Damiani;V. Kalari;A. Lanzafame;E. Pancino-E.-P