How does stellar feedback drive interstellar turbulence and molecular hydrogen formation?

恒星反馈如何驱动星际湍流和氢分子形成？

• 批准号: 2108370
• 负责人: Snezana Stanimirovic
• 金额: $ 41万
• 依托单位: University of Wisconsin-Madison
• 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=2108370&HistoricalAwards=false
• 关键词: How; does; stellar; feedback; drive

Stars are formed in the interstellar medium (ISM) in dense and cold regions that are rich in different types of molecules. To understand how stars and planets form, it is essential to understand how their molecules form out of diffuse, neutral ISM gas. Once formed, stars inject energy into the ISM causing turbulence, which shakes and stirs the future stellar birthplaces. Astronomers study the neutral ISM using the 21-cm emission line of atomic hydrogen (HI). The researchers at the University of Wisconsin-Madison will investigate how interstellar turbulence affects the diffuse gas. They will use a new radio telescope in Australia to obtain HI observations of the Magellanic Clouds. The project team will also continue with the development of a comic strip for middle school students, entitled “Galaxy scouts: Spaceventures with Stella and Riley”. This strip features excitement and products of science in daily life, with the key goal of enhancing societal scientific literacy. These materials will be publicly available. By developing the comic strip and three activity books, the group will provide a unique introduction to STEM disciplines for elementary and middle school students.This project has the following objectives. First, to quantify the influence of different astronomical sources on interstellar turbulence, the project will quantify the level of spatial variations of HI turbulent properties across the Magellanic Clouds by using a novel statistical method. Second, to provide direct constraints for numerical simulations of star formation, the exact modes of turbulent motions and scales of operations will be mapped across the Magellanic Clouds. This will constrain the fraction of turbulent energy that shakes, as opposed to stirs, the HI gas. Third, as molecular hydrogen forms from the atomic hydrogen structures affected by turbulent motions, the project will test theories that incorporate turbulence in the molecular hydrogen formation process.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.

恒星是在富含不同类型分子的致密寒冷区域的星际介质（ISM）中形成的。要了解恒星和行星是如何形成的，有必要了解它们的分子是如何从扩散的中性 ISM 气体中形成的。一旦形成，恒星就会向ISM注入能量，引起湍流，从而震动和搅动未来恒星的诞生地。天文学家使用原子氢 (HI) 的 21 厘米发射线研究中性 ISM。威斯康星大学麦迪逊分校的研究人员将研究星际湍流如何影响扩散气体。他们将使用澳大利亚的一台新射电望远镜来获得对麦哲伦云的 HI 观测结果。项目团队还将继续为中学生创作连环漫画，题为《银河侦察兵：斯特拉和莱利的太空冒险》。 该漫画以日常生活中的科学趣事和科学产品为特色，其主要目标是提高社会科学素养。这些材料将公开。 通过开发漫画和三本活动书，该小组将为中小学生提供独特的 STEM 学科介绍。该项目有以下目标。首先，为了量化不同天文来源对星际湍流的影响，该项目将通过使用一种新颖的统计方法来量化整个麦哲伦星云的HI湍流特性的空间变化水平。其次，为了为恒星形成的数值模拟提供直接约束，湍流运动的精确模式和运行规模将被绘制在麦哲伦星云上。这将限制震动（而不是搅动）HI 气体的湍流能量的部分。第三，当分子氢从受湍流运动影响的原子氢结构中形成时，该项目将测试在分子氢形成过程中纳入湍流的理论。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

Probing the Conditions for the H i-to-H2 Transition in the Interstellar Medium

探索星际介质中 H i 到 H2 跃迁的条件

• 发表时间: 2023
• 期刊: Astrophysical Journal
• 影响因子: 4.9
• 作者: Gyueun Park;Min;S. Bialy;B. Burkhart;J. Dawson;C. Heiles;Di Li;C. Murray;Hiep Nguyen;Anita Hafner;D. Rybarczyk;S. Stanimirović
• 通讯作者: S. Stanimirović

GASKAP-HI pilot survey science I: ASKAP zoom observations of Hi emission in the Small Magellanic Cloud

GASKAP-HI 试点调查科学 I：ASKAP 对小麦哲伦云中 Hi 发射的变焦观测

• DOI: 10.1017/pasa.2021.59
• 发表时间: 2022
• 期刊: Publications of the Astronomical Society of Australia
• 影响因子: 6.3
• 作者: Pingel, N. M.;Dempsey, J.;McClure-Griffiths, N. M.;Dickey, J. M.;Jameson, K. E.;Arce, H.;Anglada, G.;Bland-Hawthorn, J.;Breen, S. L.;Buckland-Willis, F.
• 通讯作者: Buckland-Willis, F.

GASKAP Pilot Survey Science. II. ASKAP Zoom Observations of Galactic 21 cm Absorption

• DOI: 10.3847/1538-4357/ac3a89
• 发表时间: 2021-11
• 期刊: The Astrophysical Journal
• 作者: J. Dickey;J. M. Dempsey;N. Pingel;N. McClure-Griffiths;K. Jameson;J. Dawson;H. D'enes;S. Clark;G. Joncas;D. Leahy;Min-Young Lee;M. Miville-Deschênes;S. Stanimirovi'c;C. Tremblay;J. V. van Loon

Atomic Hydrogen in the Milky Way: A Stepping Stone in the Evolution of Galaxies

银河系中的原子氢：星系演化的垫脚石

• DOI: 10.1146/annurev-astro-052920-104851
• 发表时间: 2023
• 期刊: Annual Review of Astronomy and Astrophysics
• 影响因子: 33.3
• 作者: McClure-Griffiths, Naomi M.;Stanimirović, Snežana;Rybarczyk, Daniel R.
• 通讯作者: Rybarczyk, Daniel R.

GASKAP-HI Pilot Survey Science III: An unbiased view of cold gas in the Small Magellanic Cloud

GASKAP-HI 试点调查科学 III：小麦哲伦星云中冷气体的公正观点

• DOI: 10.1017/pasa.2022.18
• 发表时间: 2022
• 期刊: Publications of the Astronomical Society of Australia
• 影响因子: 6.3
• 作者: Dempsey, James;McClure-Griffiths, N. M.;Murray, Claire;Dickey, John M.;Pingel, Nickolas M.;Jameson, Katherine;Dénes, Helga;van Loon, Jacco Th.;Leahy, D.;Lee, Min-Young
• 通讯作者: Lee, Min-Young