Connecting Magnetic Fields From Molecular Clouds to Protostellar Systems: The Multiscale Behaviors in Star-Forming Regions

连接磁场从分子云到原恒星系统：恒星形成区域的多尺度行为

• 批准号: 1815784
• 负责人: Zhi-Yun Li
• 金额: $ 39.03万
• 依托单位: University of Virginia Main Campus
• 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 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1815784&HistoricalAwards=false
• 关键词: Connecting; Magnetic; Fields; Molecular; Clouds

The investigators will simulate the effect of magnetic fields on the stars forming in interstellar clouds. These clouds are the birthplace of stars. The investigators will compare their theoretical results with recent observations, with the aim of understanding the importance of magnetic fields in controlling the birth of stars. Their results will also help us understand origin of our solar system. The team plans a range of educational and outreach activities. For example, they plan to animate movies of their star formation models, for use in public talks and astronomy classes. This program will also support and train women scientists during the early phase of their careers.The investigators will carry out a series of three-dimensional magneto-hydrodynamic simulations to follow the evolution of the magnetic field structure on a range of scales, from the interstellar clouds to proto-stellar systems. They will make theoretical predictions of the dust polarization based on the simulations. They will compare their predictions to observational data from the several experiments, including the Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry (BLASTPol), and the Atacama Large Millimeter/submillimeter Array (ALMA), and future data from NSF-funded TolTEC instrument on the 50-meter Large Millimeter Telescope (LMT). The goal is to determine the strength of the magnetic field in the interstellar clouds and its role in the formation of stars. A salient feature of the proposed program is the close collaboration between theorists who perform cutting-edge computer simulations and observers who are leading the effort to produce the most detailed polarization maps of star-forming clouds using BLASTPol and TolTEC on LMT. Through the most comprehensive comparison between theory and observation, the team will test their models for the role of magnetic fields in star formation.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.

研究人员将模拟磁场对星际云中形成的恒星的影响。这些云是恒星的诞生地。研究人员将他们的理论结果与最近的观测结果进行比较，目的是了解磁场在控制恒星诞生方面的重要性。 他们的结果也将帮助我们了解太阳系的起源。该团队计划开展一系列教育和外展活动。例如，他们计划将恒星形成模型制作成动画电影，用于公开演讲和天文学课程。该计划还将在女科学家职业生涯的早期阶段为她们提供支持和培训。研究人员将进行一系列三维磁流体动力学模拟，以跟踪从星际云到原恒星系统的一系列尺度上的磁场结构的演变。他们将根据模拟对尘埃偏振进行理论预测。 他们将把他们的预测与几个实验的观测数据进行比较，包括用于偏振测量的气球载大孔径亚毫米望远镜 (BLASTPol) 和阿塔卡马大型毫米/亚毫米阵列 (ALMA)，以及 NSF 资助的 50 米大型毫米望远镜 (LMT) 上的 TolTEC 仪器的未来数据。目标是确定星际云中的磁场强度及其在恒星形成中的作用。该计划的一个显着特点是进行尖端计算机模拟的理论家和领导使用 LMT 上的 BLASTPol 和 TolTEC 生成最详细的恒星形成云偏振图的观察者之间的密切合作。通过理论和观测之间最全面的比较，该团队将测试他们的模型，以了解磁场在恒星形成中的作用。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 Davis–Chandrasekhar–Fermi method revisited

重新审视戴维斯·钱德拉塞卡·费米方法

• DOI: 10.1093/mnras/stac1417
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Chen, Che-Yu;Li, Zhi-Yun;Mazzei, Renato R;Park, Jinsoo;Fissel, Laura M;Chen, Michael C-Y;Klein, Richard I;Li, Pak Shing
• 通讯作者: Li, Pak Shing

Multi-scale Dust Polarization and Spiral-like Stokes-I Residual in the Class I Protostellar System TMC-1A

I类原恒星系统TMC-1A中的多尺度尘埃偏振和螺旋状Stokes-I残差

• DOI: 10.3847/1538-4357/ac15f3
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Aso, Yusuke;Kwon, Woojin;Hirano, Naomi;Ching, Tao-Chung;Lai, Shih-Ping;Li, Zhi-Yun;Rao, Ramprasad
• 通讯作者: Rao, Ramprasad

Dust Polarization in Four Protoplanetary Disks at 3 mm: Further Evidence of Multiple Origins

• DOI: 10.3847/2041-8213/ab1e46
• 发表时间: 2019-05
• 期刊: The Astrophysical Journal Letters
• 作者: Rachel E. Harrison;L. Looney;I. Stephens;Zhi-Yun Li;Haifeng Yang;A. Kataoka;R. Harris;W. Kwon;T. Muto;M. Momose

The transition of polarized dust thermal emission from the protostellar envelope to the disc scale

偏振尘埃热发射从原恒星包层到盘尺度的转变

• DOI: 10.1093/mnras/stab2105
• 发表时间: 2021
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Lam, Ka Ho;Chen, Che-Yu;Li, Zhi-Yun;Yang, Haifeng;Cox, Erin G;Looney, Leslie W;Stephens, Ian
• 通讯作者: Stephens, Ian

Disc formation in magnetized dense cores with turbulence and ambipolar diffusion

湍流和双极扩散下磁化致密核心中圆盘的形成

• DOI: 10.1093/mnras/stz2436
• 发表时间: 2019
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Lam Ka Ho;Li Zhi-Yun;Chen Che-Yu;Tomida Kengo;Zhao Bo
• 通讯作者: Zhao Bo