Collaborative Research: Studying Magnetic Fields in the Interstellar Medium

合作研究：研究星际介质中的磁场

基本信息

批准号：
1816234
负责人：
Alexandre Lazarian
金额：
$ 37.83万
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：
2018
资助国家：
美国
起止时间：
2018-10-01 至 2022-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1816234&HistoricalAwards=false
关键词：
Collaborative Research Studying Magnetic Fields

项目摘要

Astronomers refer to the gas and dust that fills the void in space between the stars as the Interstellar Medium, or ISM. Magnetic fields are an important component of the ISM in the Milky Way Galaxy. They affect the way the gas moves and the way the gas collapses under its own weight to form stars. Being able to measure the strength of these fields is therefore very important. The team has developed their own technique, which uses gas velocities, to measure the strength of the magnetic field. By observing radio emission from atoms and molecules in the gas, the researchers can study different regions in the ISM, probing to different depths. Many of the radio observations needed for the magnetic field measurements already exist. Telescopes like the NSF-funded Green Bank telescope and the NSF-supported Arecibo Observatory have surveyed much of the ISM. The team will show how magnetic fields change in denser regions, how they affect the birth of stars, and how they change across the ISM. This project also represents a collaboration between astronomers who specialize in developing complex models of the Interstellar Medium, and astronomers with experience observing the ISM. Students at graduate and undergraduate levels from both institutions (University of Wisconsin-Madison and University of Illinois at Urbana-Champaign) will be involved in this collaboration. Indeed, student exchange is an important part of the project. The Principal Investigators (PIs) will also organize an annual workshop and will teach classes related to this research that are open to external undergraduate students. Both PIs also present to public audiences at the Wisconsin Outreach Center and Space Place, and in local high schools.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.

天文学家将填充恒星之间空间的气体和尘埃称为星际介质（ISM）。磁场是银河系ISM的重要组成部分。它们影响气体移动的方式以及气体在自身重量作用下塌缩形成恒星的方式。因此，能够测量这些场的强度非常重要。该团队开发了自己的技术，利用气体速度来测量磁场强度。通过观察气体中原子和分子的无线电发射，研究人员可以研究 ISM 中的不同区域，探测不同的深度。磁场测量所需的许多无线电观测已经存在。 NSF 资助的 Green Bank 望远镜和 NSF 支持的阿雷西博天文台等望远镜已经对 ISM 的大部分进行了观测。该团队将展示磁场如何在密度较大的区域发生变化、它们如何影响恒星的诞生，以及它们如何在整个 ISM 中发生变化。该项目还代表了专门开发星际介质复杂模型的天文学家与具有观察 ISM 经验的天文学家之间的合作。两个机构（威斯康星大学麦迪逊分校和伊利诺伊大学厄巴纳-香槟分校）的研究生和本科生将参与此次合作。事实上，学生交流是该项目的重要组成部分。首席研究员 (PI) 还将组织年度研讨会，并向外部本科生教授与这项研究相关的课程。两位 PI 还在威斯康星州外展中心和 Space Place 以及当地高中向公众展示。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

期刊论文数量（20）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Magnetic field morphology in interstellar clouds with the velocity gradient technique

利用速度梯度技术研究星际云中的磁场形态

DOI：
10.1038/s41550-019-0769-0
发表时间：
2019
期刊：
Nature Astronomy
影响因子：
14.1
作者：
Hu, Yue;Yuen, Ka Ho;Lazarian, Victor;Ho, Ka Wai;Benjamin, Robert A.;Hill, Alex S.;Lockman, Felix J.;Goldsmith, Paul F.;Lazarian, Alex
通讯作者：
Lazarian, Alex

A synergy of the velocity gradients technique and the probability density functions for identifying gravitational collapse in self-absorbing media