Islands no more: the important mergers of nearby galaxies and their effects

岛屿不再：附近星系的重要合并及其影响

• 批准号: 2007065
• 负责人: Eric Bell
• 金额: $ 45.4万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2007065&HistoricalAwards=false
• 关键词: Islands; no; more; important; mergers

Galaxy shapes can change dramatically as galaxies interact and collide with each other. In these collisions, the smaller of the two galaxies is torn to pieces and is spread into a faint ‘stellar halo’ that surrounds the larger of the two galaxies. The larger of the two galaxies survives but can be scarred by the collision. The largest collisions can cause new stars to form and can destroy galaxy disks. This research group at the University of Michigan will combine new observations with computer modeling of the past collisions experienced by nearby, well-studied galaxies. This insight will improve our understanding of galaxy growth, and these methods will be used by other astronomers using huge new datasets from the Vera C. Rubin Observatory. The investigators will measure the positive effects of adding research experiences to large introductory college science courses. If scaled-up to other institutions, this approach has the potential to enhance interest in science and science literacy.During this project, the investigators will use Hyper Suprime-Cam on the Subaru optical telescope in Hawaii. They will construct deep and wide-area maps of the stellar halos and satellite systems of a diverse sample of five galaxies with masses similar to the Milky Way mass. They plan to use these new data and models of galaxy growth to develop new metrics of the collisions experienced by a galaxy. With knowledge of these collisions in hand, they can better understand the long-term effects of these collisions on these five specific galaxies. Importantly, they seek to confirm, or refute, tentative correlations between past collisions and satellite galaxy numbers. These properties may signal important missing ingredients in small-scale cosmology and galaxy formation.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.

当星系相互作用和碰撞时，星系的形状会发生巨大的变化。在这些碰撞中，两个星系中较小的星系被撕裂成碎片，并扩散成一个微弱的“恒星晕”，环绕着两个星系中较大的星系。两个星系中较大的那个幸存了下来，但可能会在碰撞中留下疤痕。最大的碰撞可以导致新的恒星形成，并可以破坏星系盘。密歇根大学的这个研究小组将把新的观测结果与计算机模拟结合起来，模拟附近经过充分研究的星系过去所经历的碰撞。这一见解将提高我们对星系生长的理解，其他天文学家将利用来自维拉·c·鲁宾天文台的大量新数据集，使用这些方法。研究人员将测量在大型大学科学入门课程中增加研究经验的积极影响。如果扩大到其他机构，这种方法有可能提高人们对科学和科学素养的兴趣。在这个项目中，研究人员将在夏威夷的斯巴鲁光学望远镜上使用Hyper prime- cam。他们将为质量与银河系相似的5个星系的不同样本绘制恒星晕和卫星系统的深度和广域地图。他们计划利用这些新的数据和星系增长模型来开发星系所经历的碰撞的新指标。有了这些碰撞的知识，他们可以更好地了解这些碰撞对这五个特定星系的长期影响。重要的是，他们试图证实或反驳过去的碰撞与卫星星系数量之间的初步相关性。这些特性可能预示着小规模宇宙学和星系形成中缺失的重要成分。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

The Saga of M81: Global View of a Massive Stellar Halo in Formation

• DOI: 10.3847/1538-4357/abc485
• 发表时间: 2019-10
• 期刊: The Astrophysical Journal
• 作者: A. Smercina;E. Bell;P. Price;C. Slater;R. D’Souza;J. Bailin;R. D. de Jong;I. Jang;A. Monachesi;D. Nidever

Constraining the assembly time of the stellar haloes of nearby Milky Way-mass galaxies through AGB populations

通过 AGB 种群限制邻近银河系质量星系的恒星晕的组装时间

• DOI: 10.1093/mnras/stad2480
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Harmsen, Benjamin;Bell, Eric F.;D’Souza, Richard;Monachesi, Antonela;de Jong, Roelof S.;Smercina, Adam;Jang, In Sung;Holwerda, Benne W.
• 通讯作者: Holwerda, Benne W.

DESI Observations of the Andromeda Galaxy: Revealing the Immigration History of Our Nearest Neighbor

• DOI: 10.3847/1538-4357/aca5f8
• 发表时间: 2022-08
• 期刊: The Astrophysical Journal
• 作者: A. Dey;J. Najita;Sergey E. Koposov;J. Josephy-Zack;Gabriel Maxemin;E. Bell;C. Poppett;E. Patel;L. Silva;A. Raichoor;D. Schlegel;D. Lang;A. Meisner;A. Myers;J. Aguilar;S. Ahlen;C. Prieto;D. Brooks;A. Cooper;K. Dawson;A. Macorra;P. Doel;A. Font-Ribera;J. García-Bellido;S. Gontcho;J. Guy;K. Honscheid;R. Kehoe;T. Kisner;A. Kremin;M. Landriau;L. Guillou;M. Levi;T. Li;P. Martini;R. Miquel;J. Moustakas;J. Nie;N. Palanque-Delabrouille;F. Prada;E. Schlafly;R. Sharples;G. Tarlé;Y. Ting;L. Tyas;M. Valluri;R. Wechsler;H. Zou

Uncertainties associated with the backward integration of dwarf satellites using simple parametric potentials

使用简单参数势对矮卫星进行后向积分相关的不确定性

• DOI: 10.1093/mnras/stac404
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: D’Souza, Richard;Bell, Eric F.
• 通讯作者: Bell, Eric F.

Ultrafaint Dwarf Galaxy Candidates in the M81 Group: Signatures of Group Accretion

M81 群中的超微弱矮星系候选者：群吸积的特征

• DOI: 10.3847/2041-8213/ac8e5e
• 发表时间: 2022
• 期刊: The Astrophysical Journal Letters
• 作者: Bell, Eric F.;Smercina, Adam;Price, Paul A.;D’Souza, Richard;Bailin, Jeremy;de Jong, Roelof S.;Gozman, Katya;Jang, In Sung;Monachesi, Antonela;Gnedin, Oleg Y.
• 通讯作者: Gnedin, Oleg Y.