The Ecology of Galaxy Formation Within the ``Cosmic Web''

“宇宙网”内星系形成的生态学

• 批准号: 1313472
• 负责人: Charles Steidel
• 金额: $ 44.94万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1313472&HistoricalAwards=false
• 关键词: Ecology; Galaxy; Formation; Within; Cosmic

The Keck Baryonic Structure Survey (KBSS) is a unique study of the distant universe with intensive focus on the peak era of galaxy growth that occurred 10-12 billion years ago, over the cosmological redshift range from 2 to 3. KBSS measures the masess, star formation rates, stellar populations, chemistry, and gas flows in forming galaxies and the intergalactic gas surrounding them. The interface between the two, the circumgalactic medium (CGM), is the region where feedback processes will produce measureable response due to injected energy, momentum, gas, and metals. The Principal Investigator and collaborators have previously obtained extensive optical spectroscopic data on approximately 2300 galaxies in the survey fields, each of which is centered on a hyperluminous quasar. They now propose to observe these same fields with the new, NSF-funded, Multi-Object Spectrometer for Infra-Red Exploration (MOSFIRE), which their team designed and built for the Keck I telescope. With the new data, the team plans to obtain vastly improved measurements of redshift and gas kinematics for a wider range of galaxy types than previously probed, measurements of star formation rates and dust attenuation (extinction), and elemental abundances and physical conditions in the interstellar and circumgalactic media. The PI, as Project Scientist for MOSFIRE, and graduate students supported by this project will work to assist the broader astronomical community in using the instrument. The graduate students will also lead an astronomy outreach program, working with the Pasadena Unified School District to bring their enthusiasm and knowledge into 5th-8th grade classrooms.

凯克重子结构巡天（Keck Baryonic Structure Survey，KBSS）是对遥远宇宙的独特研究，重点关注100亿至120亿年前发生的星系增长高峰时期，宇宙学红移范围从2到3。KBSS测量形成中星系及其周围星系际气体的质量、星星形成率、恒星种群、化学物质和气体流动。两者之间的界面，环星系介质（CGM），是反馈过程将产生可测量的响应，由于注入的能量，动量，气体和金属的区域。主要研究者和合作者先前已经获得了调查领域中大约2300个星系的广泛光谱数据，每个星系都以超亮类星体为中心。他们现在建议用新的，NSF资助的，多目标光谱仪用于红色探测（MOSFIRE），他们的团队为凯克一号望远镜设计和建造的观测这些相同的领域。有了新的数据，研究小组计划获得比以前探测的更广泛的星系类型的红移和气体运动学的测量，星星形成率和尘埃衰减（灭绝）的测量，以及星际和环星系介质中的元素丰度和物理条件。作为MOSFIRE项目科学家的PI和该项目支持的研究生将致力于协助更广泛的天文学界使用该仪器。研究生还将领导一个天文学推广计划，与帕萨迪纳联合学区合作，将他们的热情和知识带入5 - 8年级的教室。