A Study of the Faint Debris Remnant of Large Galaxy, Small Galaxy Interactions

大星系、小星系相互作用的微弱碎片残余物的研究

• 批准号: 1614743
• 负责人: Kathryn Johnston
• 金额: $ 39.27万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-15 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1614743&HistoricalAwards=false
• 关键词: Study; Faint; Debris; Remnant; Large

Galaxies can grow bigger by accreting smaller, neighboring galaxies. The debris from such events leaves trails of stars in the outskirts of the growing galaxy. By analyzing the debris, scientists hope to reconstruct how these tumultuous events unfolded. The starlight from the debris is extremely faint at optical wavelengths. Observations of such low-surface-brightness debris have been possible only recently. The team will use cutting-edge theory and simulations to catalog the kinds of structures expected for the debris. The team's statistician will isolate the structures that help the most with the reconstructions. Observers will then look for such telltale structures. Senior team members will train junior members. During her colloquium visits nation-wide, the PI will discuss barriers facing minorities in science. Through a partnership with a non-profit, the team will engage with underserved high school students in New York City.The team will study debris structures left in galaxy halos by the destruction of small, accreted galaxies. The goals of the team are to (1) make theoretical estimates of the expected structures, (2) create libraries of synthetic surveys of simulated galaxy halos, and (3) develop and test statistical measures of various properties of the structures.

星系可以通过积聚较小的相邻星系增长。 此类事件的碎片在不断发展的银河系郊区留下了恒星径。 通过分析碎片，科学家希望重建这些动荡的事件是如何展开的。 碎片的星光在光学波长下极为微弱。 直到最近才有可能观察到这种低表面亮度碎片。 团队将使用尖端理论和模拟来分类碎片期望的结构。 该团队的统计学家将隔离最有助于重建的结构。 然后，观察者将寻找这种讲故事结构。 高级团队成员将培训初级成员。 在全国范围内访问座谈会期间，PI将讨论科学领域少数群体面临的障碍。 通过与非营利组织的合作伙伴关系，该团队将与纽约市服务不足的高中学生互动。该团队将通过破坏小型的，吸收的星系来研究银河系中留下的碎屑结构。 团队的目标是（1）对预期结构进行理论估计，（2）创建模拟星系光环的合成调查库，以及（3）对结构的各种特性进行统计测量。