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

基本信息

批准号：
1815767
负责人：
Edward Olszewski
金额：
$ 15.48万
依托单位：
University of Arizona
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=1815767&HistoricalAwards=false
关键词：
Collaborative Research Dark Matter Substructure

项目摘要

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.

银河光环涵盖了我们的家乡银河系周围巨大的、看似空旷的空间。但光环并不像看起来那么空。光晕中遍布着种类丰富的矮星系、恒星流和星团。这些结构可以揭示暗物质的性质、重元素是如何形成的以及我们的星系是如何形成的。该项目通过将大型公共天空调查的数据与通过最先进的地面设施获得的新数据相结合，推动了该领域的发展。该项目旨在识别新的恒星结构，然后探测它们的化学和动力学。结果将测试暗物质和星系形成的竞争模型。该项目建立在美国国家科学基金会之前对仪器和科学劳动力的投资基础上。该团队将继续运行 NSF 资助的密歇根/麦哲伦光纤系统 (M2FS) 摄谱仪，为其他天文学家的创新科学提供支持。这些活动通过继续成功的公共宣传计划和培训下一代天文学家来促进科学发展。主要科学目标包括 1) 探测银河系晕内微弱且以前未知的星团、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图。为了发现新天体，该团队将挖掘盖亚太空任务的数据，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，而且还识别已知结构中的稀有恒星。对于所有此类目标，该团队将使用 M2FS 摄谱仪来测量恒星速度和化学成分。最后，团队将结合Gaia和M2FS数据集，利用多维信息来推断这些结构的暗物质含量和化学演化。这些结果将推进有关暗物质性质、重元素起源、最小星系的形成和演化以及银河系恒星晕形成过程的知识前沿。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

期刊论文数量（22）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Hubble Space Telescope Imaging of Isolated Local Volume Dwarfs GALFA Dw3 and Dw4

哈勃太空望远镜对孤立局部体积矮星 GALFA Dw3 和 Dw4 的成像

DOI：
10.3847/1538-4357/ac356c
发表时间：
2022
期刊：
The Astrophysical Journal
影响因子：
0
作者：
Bennet, P.;Sand, D. J.;Crnojević, D.;Weisz, D. R.;Caldwell, N.;Guhathakurta, P.;Hargis, J. R.;Karunakaran, A.;Mutlu-Pakdil, B.;Olszewski, E.
通讯作者：
Olszewski, E.

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
影响因子：
0
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.

Stellar kinematics of dwarf galaxies from multi-epoch spectroscopy: application to Triangulum II

来自多历元光谱的矮星系恒星运动学：在三角座 II 中的应用

DOI：
10.1093/mnras/stac1441
发表时间：
2022
期刊：
Monthly Notices of the Royal Astronomical Society
影响因子：
4.8
作者：
Buttry, Rachel;Pace, Andrew B.;Koposov, Sergey E.;Walker, Matthew G.;Caldwell, Nelson;Kirby, Evan N.;Martin, Nicolas F.;Mateo, Mario;Olszewski, Edward W.;Starkenburg, Else
通讯作者：
Starkenburg, Else

Searches after Gravitational Waves Using ARizona Observatories (SAGUARO): System Overview and First Results from Advanced LIGO/Virgo’s Third Observing Run

DOI：
10.3847/2041-8213/ab32f2
发表时间：
2019-06
期刊：
The Astrophysical Journal Letters
影响因子：
0
作者：
M. Lundquist;K. Paterson;W. Fong;D. Sand;J. Andrews;I. Shivaei;P. Daly;S. Valenti;Sheng Yang-Shen
通讯作者：
M. Lundquist;K. Paterson;W. Fong;D. Sand;J. Andrews;I. Shivaei;P. Daly;S. Valenti;Sheng Yang-Shen

Galaxy Cluster Mass Estimates in the Presence of Substructure