Ancient History in the Local Group of Galaxies: The Milky Way's Faintest, Darkest, and Most Ancient Satellite Galaxies

本星系群的古代历史：银河系最暗、最暗、最古老的卫星星系

• 批准号: 1714873
• 负责人: Joshua Simon
• 金额: $ 22.03万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-01 至 2021-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1714873&HistoricalAwards=false
• 关键词: Ancient; History; Local; Group; Galaxies

The outer region of our home galaxy, the Milky Way, contains a few dozen satellite galaxies. This is surprising because hundreds are predicted by the prevailing theory of galaxy formation. The smallest satellite galaxies are also the best places to study the mysterious dark matter. The team will use cutting-edge observations at optical wavelengths to examine the satellite galaxies. The observations will help us understand galaxy formation and dark matter. Senior team members will train junior team members. The research will be featured in modern exhibits at the historic Mount Wilson Observatory in California. The exhibits will target elementary and high-school students from underrepresented groups in low-income areas.The team will obtain spectra and imaging of the recently-enlarged population of candidate satellite galaxies of the Milky Way. Their goals are to investigate (1) how many satellites are dwarf galaxies, (2) their masses and metallicities, (3) the best targets for indirect detection of dark matter, (4) the differences between dwarf galaxies originating near the Magellanic Clouds versus those formed closer to the Milky Way, (5) their orbits around the Milky Way, and (6) their chemical abundance patterns.

我们所在星系的外部区域——银河系，包含几十个卫星星系。 这是令人惊讶的，因为流行的星系形成理论预测了数百个。 最小的卫星星系也是研究神秘暗物质的最佳场所。 该团队将利用光学波长的尖端观测来检查卫星星系。 这些观测将帮助我们了解星系的形成和暗物质。 高级团队成员将对初级团队成员进行培训。 这项研究将在加利福尼亚州历史悠久的威尔逊山天文台的现代展览中展出。 展览将针对低收入地区代表性不足群体的中小学生。研究小组将获得最近扩大的银河系候选卫星星系群的光谱和成像。 他们的目标是调查（1）有多少卫星是矮星系，（2）它们的质量和金属丰度，（3）间接探测暗物质的最佳目标，（4）起源于麦哲伦云附近的矮星系与靠近银河系形成的矮星系之间的差异，（5）它们围绕银河系的轨道，以及（6）它们的化学丰度模式。

项目成果

Chemical Analysis of the Ultrafaint Dwarf Galaxy Grus II. Signature of High-mass Stellar Nucleosynthesis

• DOI: 10.3847/1538-4357/ab9643
• 发表时间: 2020-05
• 期刊: The Astrophysical Journal
• 作者: T. Hansen;J. Marshall;J. Simon;Tian Li;R. Bernstein;A. Pace;P. Ferguson;D. Nagasawa;K. Kuehn;D. Carollo;M. Geha;D. James;A. Walker;H. Diehl;M. Aguena;S. Allam;S. Ávila;E. Bertin;D. Brooks;E. Buckley-Geer;D. Burke;A. Rosell;M. Kind;J. Carretero;M. Costanzi;L. Costa;S. Desai;J. Vicente;P. Doel;K. Eckert;T. Eifler;S. Everett;I. Ferrero;J. Frieman;J. García-Bellido;E. Gaztañaga;D. Gerdes;D. Gruen;R. Gruendl;J. Gschwend;G. Gutiérrez;S. Hinton;D. Hollowood;K. Honscheid;N. Kuropatkin;M. Maia;M. March;R. Miquel;A. Palmese;F. Paz-Chinchón;A. Plazas;E. Sánchez;B. Santiago;V. Scarpine;S. Serrano;M. Smith;M. Soares-Santos;E. Suchyta;M. Swanson;G. Tarlé;T. Varga;R. Wilkinson

Birds of a Feather? Magellan/IMACS Spectroscopy of the Ultra-faint Satellites Grus II, Tucana IV, and Tucana V

• DOI: 10.3847/1538-4357/ab7ccb
• 发表时间: 2019-11
• 期刊: The Astrophysical Journal
• 作者: J. Simon;T. Li;D. Erkal;A. Pace;A. Pace;A. Drlica-Wagner;A. Drlica-Wagner;D. James;J. Marsh

Gaia Proper Motions and Orbits of the Ultra-faint Milky Way Satellites

• DOI: 10.3847/1538-4357/aacdfb
• 发表时间: 2018-04
• 期刊: The Astrophysical Journal
• 作者: J. Simon

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 First Tidally Disrupted Ultra-faint Dwarf Galaxy?: A Spectroscopic Analysis of the Tucana III Stream

• DOI: 10.3847/1538-4357/aadf91
• 发表时间: 2018-04
• 期刊: The Astrophysical Journal
• 作者: T. Li;J. Simon;K. Kuehn;A. Pace;D. Erkal;K. Bechtol;B. Yanny;A. Drlica-Wagner;J. Marshall;C. Lidman;E. Balbinot;D. Carollo;S. Jenkins;C. Martínez-Vázquez;N. Shipp;K. Stringer;A. K. Vivas;A. Walker;Risa Wechsler;F. Abdalla;S. Allam;J. Annis;S. Ávila;E. Bertin;D. Brooks;E. Buckley-Geer;D. Burke;A. Rosell;M. Kind;J. Carretero;C. Cunha;C. D'Andrea;L. Costa;C. Davis;J. Vicente;P. Doel;T. Eifler;A. Evrard;B. Flaugher;J. Frieman;J. García-Bellido;E. Gaztañaga;D. Gerdes;D. Gruen;R. Gruendl;J. Gschwend;G. Gutiérrez;W. Hartley;D. Hollowood;K. Honscheid;D. James;E. Krause;M. Maia;M. March;F. Menanteau;R. Miquel;A. Plazas;E. Sánchez;B. Santiago;V. Scarpine;R. Schindler;M. Schubnell;I. Sevilla-Noarbe;M. Smith;R. C. Smith;M. Soares-Santos;F. Sobreira;E. Suchyta;M. Swanson;G. Tarlé;D. Tucker