Star Formation, ISM, and Winds in Bursty vs. Steady Galaxies

恒星形成、ISM 和爆发性星系与稳定星系中的风

• 批准号: 2307327
• 负责人: Claude-Andre Faucher-Giguere
• 金额: $ 54.08万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2307327&HistoricalAwards=false
• 关键词: Star; Formation; ISM; Winds; Bursty

Stars form in galaxies wherever molecular gas becomes sufficiently cold and dense to become gravitationally unstable, which initiates fragmentation and subsequent collapse. Once formed, however, stars can profoundly affect their surroundings through the energy injected by supernovae, ultraviolet radiation, and fast stellar winds, processes collectively referred to as "stellar feedback." Stellar feedback can suppress the star formation rate (SFR), regulate the overall mass growth of a galaxy, and shape its multi-phase interstellar medium (ISM). While there has been much progress in modeling stellar feedback, previous work has focused primarily on Milky Way-like systems, where the SFR is fairly constant. However, star formation in low-mass and/or high-redshift galaxies tend to have highly episodic or "bursty" SFRs, where stellar feedback may work in fundamentally different ways relative to local spirals. The principal investigator and team will extend stellar feedback theory from "steady" systems to bursty ones, and in particular, the small and highly gas rich examples recently found at high-redshift that are likely the progenitors of Milky Way-like systems, and which are the focus of many observational studies by state-of-the-art ground- based and space-based observatories. In addition to a postdoc, this award will support the mentoring of three undergraduate researchers, outreach events at Chicago's Adler Planetarium and other public events, and improvements in FIREFLY, an interactive scientific visualization tool.The proposed research will be centered on a large suite of zoom-in simulations that resolve the ISM of individual galaxies in a cosmological context, and which self-consistently model the transition from bursty to steady galaxies. The simulations include all the main forms of stellar found in galaxies from dwarfs to super-L*. The project will focus on three core science issues: (1) the applicability of “equilibrium disk” or “pressure balance” models for the origin of the Kennicutt-Schmidt star formation law, (2) the dynamical and thermodynamic properties of the ISM and its relationship to the circumgalactic medium, and (3) the launching of galactic winds and galactic fountains in bursty vs. steady galaxies. Variants of the simulations will include additional physical processes (e.g., magnetic fields, cosmic rays, and non-equilibrium ISM chemistry) to test how the results depend on these additional variables. Observational predictions will be made to test the simulation predictions in the different regimes.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.

星系中的恒星形成在分子气体变得足够冷和致密以在重力上不稳定的地方形成，从而引发碎裂并随后崩溃。然而，一旦形成，恒星就可以通过超新星，紫外线辐射和快速恒星风的能量深远影响其周围环境，这些过程统称为“恒星反馈”。恒星反馈可以抑制恒星形成速率（SFR），调节星系的总体质量生长，并塑造其多相星际培养基（ISM）。尽管在建模恒星反馈方面取得了很多进展，但以前的工作主要集中在类似银河系的系统上，那里的SFR相当恒定。但是，低质量和/或高红移星系中的恒星形成往往具有高度发作性或“爆发” SFR，相对于当地螺旋形，恒星反馈可能以根本不同的方式起作用。首席研究员和团队将将出色的反馈理论从“稳定”系统扩展到爆发系统，尤其是在High-Redshift上发现的小型且高度富含气体的小型示例可能是类似银河系的系统的祖细胞，这是许多先进的地面和空间基于空间基于空间的观察者的焦点。除了进行博士后之外，该奖项还将支持三名本科研究人员的心理，芝加哥的阿德勒天文馆和其他公共活动的宣传活动以及萤火虫的改进，互动的科学可视化工具。拟议的研究将集中在大量的放大式这个缩放模拟上，这些模拟将单个星系的模拟与自我跨性别的跨越型自动化为基础，该模拟构成了自我跨性别的形式，从而模拟了自动化的形式，该模拟是构图的，该模拟的型号是构图的，该模拟是构图的，该模拟构成了构图，该模拟构成了构图，该模拟构成了构图，该模拟构成了跨越型的型号。这些模拟包括从矮人到超l*的星系中发现的所有主要形式。 The project will focus on three core science issues: (1) the applicability of “equilibrium disk” or “pressure balance” models for the origin of the Kennicutt-Schmidt star formation law, (2) the dynamic and thermodynamic properties of the ISM and its relationship to the circuitmgalactic medium, and (3) the launching of galactic winds and galactic fountains in bursty vs. steady galaxies.模拟的变体将包括其他物理过程（例如磁场，宇宙射线和非平衡ISM化学），以测试结果如何取决于这些其他变量。将做出观察性预测，以测试不同政权中的模拟预测。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响评估标准来评估，被视为珍贵的支持。

项目成果

Born this way: thin disc, thick disc, and isotropic spheroid formation in FIRE-2 Milky Way–mass galaxy simulations

• DOI: 10.1093/mnras/stad1806
• 发表时间: 2022-10
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Sijie Yu;J. Bullock;Alex Gurvich;Zachary Hafen;J. Stern;M. Boylan-Kolchin;C. Faucher-Giguère

Probing bursty star formation by cross-correlating extragalactic background light and galaxy surveys

通过河外背景光和星系调查的互相关来探测突发恒星的形成

• DOI: 10.1093/mnras/stad2000
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Sun, Guochao;Lidz, Adam;Faisst, Andreas L.;Faucher-Giguère, Claude-André
• 通讯作者: Faucher-Giguère, Claude-André

A Unified Model for the Coevolution of Galaxies and Their Circumgalactic Medium: The Relative Roles of Turbulence and Atomic Cooling Physics

星系及其环星系介质共同演化的统一模型：湍流和原子冷却物理的相对作用

• DOI: 10.3847/1538-4357/acf3ea
• 发表时间: 2023
• 期刊: The Astrophysical Journal
• 作者: Pandya, Viraj;Fielding, Drummond B.;Bryan, Greg L.;Carr, Christopher;Somerville, Rachel S.;Stern, Jonathan;Faucher-Giguère, Claude-André;Hafen, Zachary;Anglés-Alcázar, Daniel;Forbes, John C.
• 通讯作者: Forbes, John C.

Seen and unseen: bursty star formation and its implications for observations of high-redshift galaxies with JWST

可见与不可见：爆发式恒星形成及其对 JWST 观测高红移星系的影响

• DOI: 10.1093/mnras/stad2902
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Sun, Guochao;Faucher-Giguère, Claude-André;Hayward, Christopher C.;Shen, Xuejian
• 通讯作者: Shen, Xuejian

What causes the formation of discs and end of bursty star formation?

是什么导致了圆盘的形成和爆发式恒星形成的结束？

• DOI: 10.1093/mnras/stad1902
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Hopkins, Philip F.;Gurvich, Alexander B.;Shen, Xuejian;Hafen, Zachary;Grudić, Michael Y.;Kurinchi-Vendhan, Shalini;Hayward, Christopher C.;Jiang, Fangzhou;Orr, Matthew E.;Wetzel, Andrew
• 通讯作者: Wetzel, Andrew