POLSTAR Survey: Magnetic Fields in Star Forming Filaments

POLSTAR 巡天：恒星形成细丝中的磁场

• 批准号: 2309536
• 负责人: Thushara Pillai
• 金额: $ 47.86万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-01-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2309536&HistoricalAwards=false
• 关键词: POLSTAR; Survey; Magnetic; Fields; Star

Polarized thermal emission from spinning dust grains that align themselves with the magnetic field can be used to trace the magnetic field structure projected onto the plane of the sky. With powerful polarimeters on new facilities, the window to the polarized sky is just opening up now. This makes a systematic investigation into magnetic fields in galaxies a very timely project. This investigator created the POLSTAR survey of selected star forming regions in the Milky Way. Her team is combining existing images with new observations of the polarization properties of these objects. With POLSTAR, the team has capitalized on this technical progress to acquire a unique and comprehensive data set of polarized dust and line emission on several world class telescopes to develop a comprehensive vision of the magnetized dense interstellar medium. The investigator’s work aims to clarify how magnetic fields affect star formation in high-mass dense filamentary dark clouds and how the fields change when stars form. Through this award, a graduate student will be trained, and several high-school minority students will have the opportunity to work with astronomical data visualization and analysis tools. Using POLSTAR data investigators team will provide the most comprehensive multi-wavelength overview of the role of magnetic fields in forming high-mass dark clouds and stars within them. They seek to understand the evolution of a high-mass dark clouds and how magnetic fields change the star formation process. The magnetic fields are thought to slow down star formation and the team will measure the density threshold where the fields give way to gravity. Analysis of the multi-wavelength multi-scale polarization data will be crucial to constrain theories on how spinning dust grains align. In conjunction with mock observations using advanced simulations of clouds with different input magnetic field strengths, this project will provide images of the initial conditions for star-formation in an important sample of Milky Way Clouds.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.

旋转尘埃颗粒与磁场对齐的极化热发射可以用来追踪投射到天空平面上的磁场结构。随着新设备上强大的偏振光计的出现，观测偏振光天空的窗口正在打开。这使得对星系磁场的系统研究成为一个非常及时的项目。这位研究人员对银河系中选定的恒星形成区域进行了POLSTAR调查。她的团队正在将现有的图像与对这些物体偏振特性的新观察结合起来。有了POLSTAR，该团队利用这一技术进步，在几个世界级的望远镜上获得了独特而全面的极化尘埃和线发射数据集，以开发磁化致密星际介质的全面视野。研究人员的工作旨在阐明磁场如何影响高质量致密丝状黑云中的恒星形成，以及当恒星形成时磁场如何变化。通过这个奖项，一名研究生将得到培训，几名高中少数民族学生将有机会使用天文数据可视化和分析工具。利用POLSTAR数据，研究小组将提供磁场在形成大质量黑云和黑云内恒星中的作用的最全面的多波长概述。他们试图了解大质量黑云的演变，以及磁场如何改变恒星形成过程。磁场被认为减缓了恒星的形成，研究小组将测量密度阈值，在这个阈值上磁场让位于引力。多波长多尺度偏振数据的分析对于约束旋转尘埃颗粒如何排列的理论至关重要。结合对不同输入磁场强度的云进行高级模拟的模拟观测，该项目将在一个重要的银河系云样本中提供恒星形成初始条件的图像。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识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

Fragmentation of the High-mass “Starless” Core G10.21-0.31: A Coherent Evolutionary Picture for Star Formation

• DOI: 10.3847/1538-4357/acb211
• 发表时间: 2023-01
• 期刊: The Astrophysical Journal
• 作者: Wenyu Jiao;Ke Wang;T. Pillai;T. Baug;Siju Zhang;F. Xu

The Haystack Telescope as an Astronomical Instrument

• DOI: 10.3390/galaxies11010009
• 发表时间: 2023-01
• 期刊: Galaxies
• 影响因子: 2.5
• 作者: J. Kauffmann;G. Rajagopalan;K. Akiyama;V. Fish;C. Lonsdale;L. Matthews;T. Pillai

The distance to the Serpens South cluster from H 2 O masers

H 2 O脉泽到巨蛇南星团的距离

• DOI: 10.1051/0004-6361/202346369
• 发表时间: 2023
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: Ortiz-León, Gisela N.;Dzib, Sergio A.;Loinard, Laurent;Gong, Yan;Pillai, Thushara;Plunkett, Adele
• 通讯作者: Plunkett, Adele

Infall and outflow towards high-mass starless clump candidates

流入和流出大质量无星团簇候选者

• DOI: 10.1093/mnras/stad1073
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Pillai, T. G. S.;Urquhart, J. S.;Leurini, S.;Zhang, Q.;Traficante, A.;Colombo, D.;Wang, K.;Gomez, L.;Wyrowski, F.
• 通讯作者: Wyrowski, F.

CMZoom III: Spectral line data release

CMZoom III：谱线数据发布

• DOI: 10.1093/mnras/stad388
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Callanan, Daniel;Longmore, Steven N.;Battersby, Cara;Hatchfield, H. Perry;Walker, Daniel L.;Henshaw, Jonathan;Keto, Eric;Barnes, Ashley;Ginsburg, Adam;Kauffmann, Jens
• 通讯作者: Kauffmann, Jens