Magnetic Fields in the Central Molecular Zone Influenced by Feedback and Weakly Correlated with Star Formation

被引:7
作者
Lu, Xing [1 ]
Liu, Junhao [2 ,3 ]
Pillai, Thushara [2 ]
Zhang, Qizhou [1 ]
Liu, Tie [1 ,4 ]
Gu, Qilao [1 ]
Hasegawa, Tetsuo [2 ]
Li, Pak Shing [1 ]
Tang, Xindi [1 ,5 ]
Hatchfield, H. Perry [1 ,5 ]
Issac, Namitha [1 ]
Liu, Xunchuan [1 ]
Luo, Qiuyi [1 ,5 ]
Mai, Xiaofeng [1 ,5 ]
Shen, Zhiqiang [1 ,4 ]
机构
[1] Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
[2] Natl Astron Observ Japan, 2-21-1 Osawa,Mitaka Ku, Tokyo 1818588, Japan
[3] East Asian Observ, 660 N Aohoku Pl,Univ Pk, Hilo, HI 96720 USA
[4] Chinese Acad Sci, Key Lab Radio Astron & Technol, A20 Datun Rd, Beijing 100101, Peoples R China
[5] Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
基金
美国国家科学基金会; 中国国家自然科学基金; 上海市自然科学基金; 国家重点研发计划; 英国科学技术设施理事会;
关键词
JCMT BISTRO SURVEY; H II REGIONS; GALACTIC-CENTER; FORMATION RATES; ALMA OBSERVATIONS; CLOUD EVOLUTION; MASSIVE CLOUDS; POLARIZATION; GAS; DYNAMICS;
D O I
10.3847/1538-4357/ad1395
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Magnetic fields of molecular clouds in the central molecular zone (CMZ) have been relatively under-observed at sub-parsec resolution. Here, we report JCMT/POL2 observations of polarized dust emission in the CMZ, which reveal magnetic field structures in dense gas at similar to 0.5 pc resolution. The 11 molecular clouds in our sample include two in the western part of the CMZ (Sgr C and a farside cloud candidate), four around the Galactic longitude 0 (the 50 km s-1 cloud, CO 0.02-0.02, the Stone, and the Sticks and Straw among the Three Little Pigs), and five along the Dust Ridge (G0.253+0.016, clouds b, c, d, and e/f), for each of which we estimate the magnetic field strength using the angular dispersion function method. The morphologies of magnetic fields in the clouds suggest potential imprints of feedback from expanding H ii regions and young massive star clusters. A moderate correlation between the total viral parameter versus the star formation rate (SFR) and the dense gas fraction of the clouds is found. A weak correlation between the mass-to-flux ratio and the SFR, and a weak anticorrelation between the magnetic field and the dense gas fraction are also found. Comparisons between magnetic fields and other dynamic components in clouds suggest a more dominant role of self-gravity and turbulence in determining the dynamical states of the clouds and affecting star formation at the studied scales.
引用
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页数:23
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