Collaborative Research: The Hierarchical Mergers of Low Mass Galaxies

合作研究：低质量星系的分层合并

• 批准号: 1715944
• 负责人: Mary Putman
• 金额: $ 10.15万
• 依托单位: Columbia University
• 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: 2017-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1715944&HistoricalAwards=false
• 关键词: Collaborative; Research; Hierarchical; Mergers; Low

Astronomical observations show that collisions between large galaxies are violent events. During collisions galaxies form many stars, and the galaxies change shape. Sometimes small galaxies, called dwarf galaxies, merge with larger galaxies during collisions. Other times the collisions produce long trains of stars thrown out into the space between galaxies. The investigators have numerically simulated the mergers of dwarf galaxies and studied the remnants of these mergers. In this project, they will improve their simulations and compare the simulations with new observations. New telescopes, like the Large Synoptic Survey Telescope (LSST), are designed to study the smallest and faintest galaxies in the Universe. Many more colliding dwarf galaxies are soon to be discovered with these telescopes. The investigators will use their simulations to better understand the merger history of galaxies. This topic is important for understanding the history of formation of our own Milky Way galaxy. This collaborative project will leverage strong existing outreach efforts at both Columbia University and The University of Arizona. They will expand the TIMESTEP program, which reaches under-represented minorities and develops a community to support them throughout their academic careers. They will also support graduate students who produce popular YouTube videos, which answer top public astronomy questions.The investigators will improve their previous simulations by increasing mass resolution of the cosmological simulations and by modeling larger volumes of space. They plan to model dwarf galaxy pairs in the region near our Milky Way galaxy. They will dynamically match the models and explore the role of dwarf-dwarf galaxy mergers. The investigators will also create a simulated catalog of dwarf sub-halo pairs using the high-resolution, dark-matter-only, cosmological simulation. They will compare the observed dwarf galaxy pair counts with expectations of Lambda Cold Dark Matter cosmological models.

天文观察表明，大星系之间的碰撞是暴力事件。 在碰撞期间，星系形成了许多恒星，星系会改变形状。 有时，小星系（称为矮星系）在碰撞过程中与较大的星系合并。 其他时候，碰撞会产生长列恒星，这些星星被扔进星系之间的空间。 研究人员在数字上模拟了矮星系的合并，并研究了这些合并的残余物。 在这个项目中，他们将改进模拟，并将模拟与新观察结果进行比较。 新的望远镜，例如大型概要调查望远镜（LSST），旨在研究宇宙中最小，最微弱的星系。 这些望远镜很快就会发现更多相撞的矮人星系。 调查人员将使用模拟更好地了解星系的合并历史。 该主题对于理解我们银河系的形成历史很重要。 这个合作项目将利用哥伦比亚大学和亚利桑那大学的强大现有外展工作。 他们将扩大时间末计划，该计划达到了代表性不足的少数群体，并建立了一个社区来在整个学术职业中为他们提供支持。 他们还将支持制作流行的YouTube视频的研究生，这些视频回答了顶级的公共天文学问题。研究人员将通过增加宇宙学模拟的质量分辨率并通过建模更大的空间来改善其先前的模拟。 他们计划在我们银河系附近的该地区建模矮星系对。 它们将动态匹配模型并探索矮人划线星系合并的作用。 研究人员还将使用高分辨率，仅黑色的宇宙学模拟来创建矮次山脉对的模拟目录。 他们将将观察到的矮星系对数与Lambda冷暗物质宇宙学模型的期望进行比较。

项目成果

Modelling the baryon cycle in low-mass galaxy encounters: the case of NGC 4490 and NGC 4485

模拟低质量星系相遇中的重子周期：NGC 4490 和 NGC 4485 的案例

• DOI: 10.1093/mnras/sty2052
• 发表时间: 2018
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Pearson, Sarah;Privon, George C;Besla, Gurtina;Putman, Mary E;Martínez-Delgado, David;Johnston, Kathryn V;Gabany, R Jay;Patton, David R;Kallivayalil, Nitya
• 通讯作者: Kallivayalil, Nitya

The frequency of dwarf galaxy multiples at low redshift in SDSS versus cosmological expectations

SDSS 中低红移处矮星系倍数的频率与宇宙学预期

• DOI: 10.1093/mnras/sty2041
• 发表时间: 2018
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Besla, Gurtina;Patton, David R.;Stierwalt, Sabrina;Rodriguez-Gomez, Vicente;Patel, Ekta;Kallivayalil, Nitya J.;Johnson, Kelsey E.;Pearson, Sarah;Privon, George C.;Putman, Mary E.
• 通讯作者: Putman, Mary E.