New Probes of Galactic Outflows at the Peak Epoch of Star Formation

恒星形成高峰时期银河流出的新探测器

• 批准号: 2108515
• 负责人: Tucker Jones
• 金额: $ 38.53万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2108515&HistoricalAwards=false
• 关键词: New; Probes; Galactic; Outflows; Peak

Galaxy formation is regulated by feedback in the form of large-scale outflows of gas. The details of this process are poorly understood as it is difficult to observe the faint emission from the gas. Principal Investigator (PI) Jones has identified a sample of gravitationally lensed galaxies, where a foreground galaxy bends the light from the distant galaxy and magnifies its weak emission. The PI will observe these lensed galaxies using the Keck Cosmic Web Imager (KCWI) instrument at the W. M. Keck Observatory to study how galactic outflows shaped their formation ten billion years ago. As part of this program the PI will teach scientific research methods to high school students in the California State Summer School for Mathematics and Science (COSMOS), with lectures on galaxies and cosmology, and an introduction to observational astronomy techniques using a rooftop telescope facility at the University of California - Davis campus. This proposal will support the analysis of data already in hand and additional observations of a larger sample. Integral field spectroscopy with the KCWI instrument will map the spatial extent and kinematics of outflowing gas using fluorescent emission lines, which will improve estimates of the mass loss rates. The same data also enable maps of the outflowing gas in absorption, which probes outflow energetics and launching sites as well as the chemical composition. The non-refractory element sulfur provides a measurement of total alpha-element metallicity relative to neutral hydrogen, while other elements such as silicon and nickel are sensitive to dust content and abundance patterns. Collectively these results will address the physical properties of galactic outflows and their role in regulating galaxy assembly at redshifts z=2-3.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

星系的形成是由大规模气体流出的反馈调节的。由于很难观测到气体发出的微弱辐射，人们对这一过程的细节知之甚少。首席研究员（PI）琼斯已经确定了一个引力透镜星系的样本，其中前景星系弯曲了来自遥远星系的光，并放大了其微弱的发射。PI将使用凯克天文台的凯克宇宙网成像仪（KCWI）来观测这些透镜星系，以研究100亿年前星系外流如何形成它们。作为该计划的一部分，PI将向加州州立数学与科学暑期学校（COSMOS）的高中生教授科学研究方法，包括星系和宇宙学讲座，以及利用加州大学戴维斯分校屋顶望远镜设施介绍观测天文学技术。这项建议将支持对现有数据的分析和对更大样本的额外观察。KCWI仪器的积分场光谱将利用荧光发射线绘制出流出气体的空间范围和运动学，这将提高对质量损失率的估计。同样的数据还可以绘制出吸收中流出气体的地图，探测出流出的能量和发射地点以及化学成分。非耐火元素硫提供了相对于中性氢的总α元素金属丰度的测量，而其他元素如硅和镍则对粉尘含量和丰度模式敏感。总的来说，这些结果将解决星系外流的物理特性及其在调节红移z=2-3时星系聚集中的作用。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

The AGEL Survey: Spectroscopic Confirmation of Strong Gravitational Lenses in the DES and DECaLS Fields Selected Using Convolutional Neural Networks

• DOI: 10.3847/1538-3881/ac7da2
• 发表时间: 2022-05
• 期刊: The Astronomical Journal
• 作者: K. Tran;A. Harshan;K. Glazebrook;Keerthi Vasan G. C.;T. Jones;C. Jacobs;G. Kacprzak;T. Barone

A Glimpse of the Stellar Populations and Elemental Abundances of Gravitationally Lensed, Quiescent Galaxies at z ≳ 1 with Keck Deep Spectroscopy

• DOI: 10.3847/1538-4357/acc79b
• 发表时间: 2022-12
• 期刊: The Astrophysical Journal
• 作者: Z. Zhuang;N. Leethochawalit;E. Kirby;J. Nightingale;C. Steidel;K. Glazebrook;T. Barone;Hannah Skobe;S. Sweet;T. Nanayakkara;R. Allen;Keerthi Vasan G. C.;T. Jones;G. Kacprzak;K. Tran;C. Jacobs

Optimizing machine learning methods to discover strong gravitational lenses in the deep lens survey

优化机器学习方法以发现深透镜巡天中的强引力透镜

• DOI: 10.1093/mnras/stad1709
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Keerthi Vasan, G. C.;Sheng, Stephen;Jones, Tucker;Choi, Chi Po;Sharpnack, James
• 通讯作者: Sharpnack, James

Spectroscopy of CASSOWARY gravitationally lensed galaxies in SDSS: characterization of an extremely bright reionization-era analogue at z = 1.42

SDSS 中食火鸡引力透镜星系的光谱：z = 1.42 处极其明亮的再电离时代类似物的表征

• DOI: 10.1093/mnras/stad387
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Mainali, Ramesh;Stark, Daniel P.;Jones, Tucker;Ellis, Richard S.;Hezaveh, Yashar D.;Rigby, Jane R.
• 通讯作者: Rigby, Jane R.

LensingETC: A Tool to Optimize Multifilter Imaging Campaigns of Galaxy-scale Strong Lensing Systems

LensingETC：优化银河级强​​透镜系统多滤光片成像活动的工具

• DOI: 10.3847/1538-4357/ac927b
• 发表时间: 2022
• 期刊: The Astrophysical Journal
• 作者: Shajib, Anowar J.;Glazebrook, Karl;Barone, Tania;Lewis, Geraint F.;Jones, Tucker;Tran, Kim-Vy H.;Buckley-Geer, Elizabeth;Collett, Thomas E.;Frieman, Joshua;Jacobs, Colin
• 通讯作者: Jacobs, Colin