CAREER: Mapping the Fuel for Star Formation Across Cosmic History

职业：绘制宇宙历史中恒星形成的燃料图

• 批准号: 1653228
• 负责人: Daniel Marrone
• 金额: $ 79.03万
• 依托单位: University of Arizona
• 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: 2017-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1653228&HistoricalAwards=false
• 关键词: CAREER; Mapping; Fuel; Star; Formation

Molecular gas is the raw material for star formation in galaxies. To understand how the total stellar mass of the universe was formed, we must understand how the fuel for star formation has been assembled and consumed over cosmic history. This project will measure the molecular gas content of the universe over most of its history, beginning more than 10 billion years ago, using the "intensity mapping" technique. Intensity mapping aggregates the signal from numerous undetectable galaxies to capture the distribution of molecular gas through three-dimensional volumes of the universe, across the sky and back into cosmic history. To achieve this goal, the team will mine the archives of the largest radio telescopes and conduct new experiments using advanced instruments. This project includes a focused effort to improve the teaching of important science topics through radio technology, from non-science undergraduates through astronomy graduate students. The implementation of this work is centered on paid research experiences for cohorts of STEM majors who are at risk of leaving the university.The proposed research will measure the growth and consumption of molecular gas across the last 10 billion years of cosmic history. Molecular gas is the raw material that powers the process of star formation in galaxies, and a chart of its history can contribute significantly to our understanding of the process of galaxy formation. Unlike the stars themselves, the cold gas from which they form is very faint and hard to observe beyond the nearby universe. The proposed project will overcome this challenge through the technique of "intensity mapping," in which the light from tens of thousands of galaxies is integrated together to generate a detectable signal despite the fact that few of the galaxies can be seen individually. The team will use a variety of data sources to assemble a comprehensive picture of the molecular fuel, including archival data from radio telescope arrays and experiments designed specifically for this type of measurement. The work will culminate in a large program of intensity mapping with the TIME multi-pixel spectrometer, which will be installed on the 12m ALMA prototype antenna of the Arizona Radio Observatory. As part of this program, the PI will use radio science and digital signal processing hardware to enhance the teaching of critical science topics at all levels, from undergraduate general education to upper division majors and graduate students. These activities will provide research experience to cohorts of students from the university's ASEMS program, which increases the persistence of STEM majors, particularly those who are first-in-family students, from low-income households, community college transfers, and/or members of groups underrepresented in STEM.

分子气体是星系中形成星星的原料。为了了解宇宙中恒星的总质量是如何形成的，我们必须了解在宇宙历史中星星形成的燃料是如何聚集和消耗的。该项目将使用“强度映射”技术测量宇宙历史上大部分时间的分子气体含量，从100多亿年前开始。强度映射聚集了来自众多无法检测到的星系的信号，以捕捉分子气体在宇宙三维空间中的分布，穿过天空并回到宇宙历史中。为了实现这一目标，该团队将挖掘最大射电望远镜的档案，并使用先进的仪器进行新的实验。该项目包括通过无线电技术重点改进从非理科本科生到天文学研究生的重要科学课题的教学。这项工作的实施集中在有可能离开大学的STEM专业学生的有偿研究经验上。拟议的研究将测量过去100亿年宇宙历史中分子气体的增长和消耗。分子气体是推动星系中星星形成过程的原材料，它的历史图表可以大大有助于我们理解星系形成的过程。与恒星本身不同，它们形成的冷气体非常微弱，很难在附近的宇宙之外观察到。拟议中的项目将通过“强度映射”技术克服这一挑战，其中来自数万个星系的光被整合在一起，以产生可检测的信号，尽管事实上很少有星系可以单独看到。该团队将使用各种数据源来收集分子燃料的全面图片，包括来自射电望远镜阵列的档案数据和专门为这种测量设计的实验。这项工作将最终在一个大型计划的强度映射与时间多像素光谱仪，这将是安装在12米阿尔马原型天线的亚利桑那州无线电天文台。作为该计划的一部分，PI将使用无线电科学和数字信号处理硬件来加强各级关键科学主题的教学，从本科通识教育到高年级专业和研究生。这些活动将为来自大学ASEMS计划的学生提供研究经验，该计划增加了STEM专业的持续性，特别是那些来自低收入家庭，社区大学转学生和/或STEM中代表性不足的群体成员的第一家庭学生。

项目成果

An Intensity Mapping Detection of Aggregate CO Line Emission at 3 mm

3 mm 处 CO 线总排放的强度映射检测

• DOI: 10.3847/1538-4357/abb08e
• 发表时间: 2020
• 期刊: The Astrophysical Journal
• 作者: Keating, Garrett K.;Marrone, Daniel P.;Bower, Geoffrey C.;Keenan, Ryan P.
• 通讯作者: Keenan, Ryan P.

A survey of CH2DOH towards starless and pre-stellar cores in the Taurus molecular cloud

对金牛座分子云中无星和前恒星核心的 CH2DOH 调查

• DOI: 10.1093/mnras/staa3649
• 发表时间: 2020
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Ambrose, Hannah E;Shirley, Yancy L;Scibelli, Samantha
• 通讯作者: Scibelli, Samantha

Probing Cosmic Reionization and Molecular Gas Growth with TIME

• DOI: 10.3847/1538-4357/abfe62
• 发表时间: 2020-12
• 期刊: The Astrophysical Journal
• 作者: Guochao Sun;T. Chang;B. Uzgil;J. Bock;C. Bradford;V. Butler;Tessalie Caze-Cortes;Yun-Ting Cheng-Yun-Ting-C

Biases and Cosmic Variance in Molecular Gas Abundance Measurements at High Redshift

高红移下分子气体丰度测量的偏差和宇宙方差

• DOI: 10.3847/1538-4357/abbd9b
• 发表时间: 2020
• 期刊: The Astrophysical Journal
• 作者: Keenan, Ryan P.;Marrone, Daniel P.;Keating, Garrett K.
• 通讯作者: Keating, Garrett K.

An Intensity Mapping Constraint on the CO-galaxy Cross-power Spectrum at Redshift ∼3

• DOI: 10.3847/1538-4357/ac4888
• 发表时间: 2021-10
• 期刊: The Astrophysical Journal
• 作者: R. Keenan;G. Keating;D. Marrone