The Evolution of Galaxy Fueling and Feedback in the Last 7 Billion Years

过去 70 亿年来星系燃料和反馈的演变

• 批准号: 1812531
• 负责人: Jessica Werk
• 金额: $ 55.61万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2022-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1812531&HistoricalAwards=false
• 关键词: Evolution; Galaxy; Fueling; Feedback; Last

Most of the atomic matter in the Universe courses through the dark, vast spaces between galaxies. This diffuse gas cycles into and out of galaxies multiple times. It will form new stars and become swept up in violent stellar end-of-life processes. Astronomers believe that this gaseous cycle lies at the heart of galaxy evolution. Yet, it has been difficult to observe directly. This project will include analysis of new telescope observations of hundreds of galaxies and their associated gaseous halos. Combining these data with large computer simulations will greatly advance the current picture of galaxy evolution. In addition, the analysis will track how the composition of the gas evolves over billions of years of cosmic history. This program includes an educational component focused on training University of Washington students in scientific research. Driven by recent advancements in UV instrumentation and computational capabilities, observations and simulations of the diffuse gas in the circumgalactic medium (CGM) are a new frontier of galaxy evolution studies. This study will directly address key questions about the physical connection between galaxies and their CGM. The observational dataset combines high-resolution HST/COS UV spectra of 30 z=1 QSOs with deep, optical spectroscopy and imaging from Gemini and Keck telescopes of hundreds of foreground galaxies per QSO field. The comprehensive galaxy-absorber catalogs produced by this study will: (1) be 5 times larger than all previous low-redshift samples combined; (2) cover an epoch that has never before been systematically surveyed (z = 0.3 -1; spanning approx. 5 Gyr), and (3) expand the physical distances probed in the halos from 0.5 -3 times the virial radii. In total, this program will constrain the physical properties of gas physically associated with a large, varied sample of galaxies at redshifts ranging from 0.1-1 and compare these quantities with cosmological, hydrodynamical simulations. This program will serve as a benchmark for the next decade of CGM studies. In collaboration with faculty and staff at Seattle Central College (SCC), this program will also establish a multifaceted undergraduate research program designed to facilitate STEM student transfers between local community colleges and the University of Washington and retain, mentor, and financially support transfer students. This research and mentorship program will foster education in STEM and broaden participation in science.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.

宇宙中的大部分原子物质都穿过星系之间黑暗而广阔的空间。这种扩散气体多次循环进出星系。它将形成新的恒星，并卷入剧烈的恒星生命终结过程中。天文学家认为，这种气体循环是星系演化的核心。然而，直接观察却很困难。 该项目将包括对数百个星系及其相关气态晕的新望远镜观测结果进行分析。将这些数据与大型计算机模拟相结合将极大地推进当前星系演化的图景。 此外，该分析还将跟踪气体成分在数十亿年的宇宙历史中如何演变。该计划包括一个专注于培训华盛顿大学学生进行科学研究的教育部分。在紫外线仪器和计算能力最新进步的推动下，对环星系介质（CGM）中扩散气体的观测和模拟成为星系演化研究的新领域。这项研究将直接解决有关星系及其 CGM 之间物理联系的关键问题。观测数据集将 30 z=1 QSO 的高分辨率 HST/COS 紫外光谱与双子座和凯克望远镜对每个 QSO 场数百个前景星系的深光谱和成像相结合。这项研究产生的综合星系吸收体目录将：（1）比之前所有低红移样本的总和大 5 倍； (2) 覆盖以前从未被系统测量过的纪元（z = 0.3 -1；跨越约 5 Gyr），以及 (3) 将光晕中探测的物理距离从维里半径的 0.5 -3 倍扩大。总的来说，该计划将限制与红移范围为 0.1-1 的大量不同星系样本物理相关的气体的物理特性，并将这些量与宇宙学、流体动力学模拟进行比较。该计划将作为未来十年 CGM 研究的基准。 该计划还将与西雅图中央学院 (SCC) 的教职员工合作，建立一个多方面的本科生研究计划，旨在促进当地社区学院和华盛顿大学之间的 STEM 学生转学，并保留、指导和经济支持转学学生。 这项研究和指导计划将促进 STEM 教育并扩大科学参与。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力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 QuaStar Survey: Detecting Hidden Low-velocity Gas in the Milky Way’s Circumgalactic Medium

• DOI: 10.3847/1538-4357/abeb6b
• 发表时间: 2020-10
• 期刊: The Astrophysical Journal
• 作者: H. Bish;J. Werk;J. Peek;Yonggang Zheng;M. Putman

Figuring Out Gas & Galaxies In Enzo (FOGGIE). V. The Virial Temperature Does Not Describe Gas in a Virialized Galaxy Halo

计算出气体

• DOI: 10.3847/1538-4357/ac2496
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Lochhaas, Cassandra;Tumlinson, Jason;O’Shea, Brian W.;Peeples, Molly S.;Smith, Britton D.;Werk, Jessica K.;Augustin, Ramona;Simons, Raymond C.
• 通讯作者: Simons, Raymond C.

An Empirical Determination of the Dependence of the Circumgalactic Mass Cooling Rate and Feedback Mass Loading Factor on Galactic Stellar Mass

• DOI: 10.3847/1538-4357/ac0433
• 发表时间: 2021-04
• 期刊: The Astrophysical Journal
• 作者: H. Zhang 张;D. Zaritsky;K. Olsen;P. Behroozi;J. Werk;R. Kennicutt;Lizhi 利智 Xie 谢;X. Yang 杨;T. Fang 方;G. De Lucia;M. Hirschmann;F. Fontanot

One–Two Quench: A Double Minor Merger Scenario

• DOI: 10.3847/1538-4357/abeb15
• 发表时间: 2020-09
• 期刊: The Astrophysical Journal
• 作者: N. N. Sanchez-N.;M. Tremmel;J. Werk;A. Pontzen;C. Christensen;T. Quinn;S. Loebman;Akaxia Cruz

The COS Absorption Survey of Baryon Harbors: unveiling the physical conditions of circumgalactic gas through multiphase Bayesian ionization modelling

重子港的 COS 吸收调查：通过多相贝叶斯电离模型揭示环星系气体的物理条件

• DOI: 10.1093/mnras/staa3544
• 发表时间: 2021
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Haislmaier, Karl J;Tripp, Todd M;Katz, Neal;Prochaska, J Xavier;Burchett, Joseph N;O’Meara, John M;Werk, Jessica K
• 通讯作者: Werk, Jessica K