The Triggering and Quenching of Star-Formation and Nuclear Activity in Galaxies

星系中恒星形成和核活动的触发和猝灭

• 批准号: 1411943
• 负责人: Lori Lubin
• 金额: $ 35.08万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2018-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1411943&HistoricalAwards=false
• 关键词: Triggering; Quenching; Star; Formation; Nuclear

Galaxy surveys in the local universe such as the Sloan Digital Sky Survey have shown that galaxies populate two broad categories: blue, star-forming disk galaxies and red, quiescent spheroidal or early-type galaxies. In the nearby universe, the most luminous and massive galaxies are quiescent, and they are preferentially found in dense environments, such as groups and clusters. In contrast, star-forming galaxies have lower stellar masses and occupy low-density environments. Astronomers also know that star-formation in the universe was significantly more active several billion years ago. The key question that will be answered by this research is the following: what physical processes drive the suppression of star formation and nuclear activity between early times and the present day.This award will enable for the next phase of the Observations of Redshift Evolution in Large Scale Environments (ORELSE) survey of galaxies. This includes a comprehensive, near-IR spectroscopic survey with the Multi-Object Spectrometer For Infra-Red Exploration (MOSFIRE) on the Keck 10-m telescope, together with multi-wavelength (X-ray, radio, and infrared) observations. By correlating with the precise measures of local and global environment afforded by ORELSE, the program will determine the cause and effect of gas-fueling and quenching events that drive galaxy evolution over a critical 3-billion year period where star formation and nuclear activity are rapidly declining.This award will also expand the underrepresented student base by supporting the Mentorship for Undergraduate Research Participants in Physical and Mathematical Sciences (MURPPS) program at the University of California-Davis. The program will increase the number of underrepresented students who can participate in MURPPS by over 30% and is directly aligned with the NSF's commitment to achieve full participation of women, persons with disabilities, and underrepresented minorities in STEM fields.

在局部宇宙中的星系巡天，如斯隆数字巡天（英语：Sloan Digital Sky Survey），显示星系有两大类：蓝色的恒星形成盘星系和红色的静止球状或早期型星系。在附近的宇宙中，最明亮和质量最大的星系是静止的，它们优先出现在稠密的环境中，如星系团和星系团。相比之下，恒星形成星系的恒星质量较低，并且占据低密度环境。天文学家还知道，几十亿年前宇宙中的恒星形成要活跃得多。这项研究将回答的关键问题是：什么物理过程驱动早期和现代之间的星星形成和核活动的抑制。该奖项将使下一阶段的观测红移演化在大尺度环境（OSCHE）调查星系。这包括利用凯克10米望远镜上的多目标光谱仪进行全面的近红外光谱调查，以及多波长（X射线，无线电和红外线）观测。通过与OCEAN SE提供的当地和全球环境的精确测量相关联，该计划将确定气体燃料和淬火事件的原因和影响，这些事件推动星系演化超过关键的3-十亿年的时间里，星星的形成和核活动正在迅速下降。该奖项还将通过支持物理和数学本科生研究参与者的导师计划，扩大代表性不足的学生基础。科学（MURPPS）计划在加州大学戴维斯分校。该计划将使能够参加MURPPS的代表性不足的学生人数增加30%以上，并与NSF实现妇女，残疾人和代表性不足的少数民族在STEM领域充分参与的承诺直接一致。