JCMT BISTRO调查：揭示银河中心磁场
星系天体物理
2025-03-10 v1
摘要
我们获得了针对中央分子区（CMZ）内区域的450 μm和850 μm尘埃连续极化观测数据，作为B-Fields In Star-Forming Region Observations（BISTRO）调查的一部分，使用位于詹姆斯·克莱尔·麦克斯韦望远镜上的POL-2极化仪器。这些观测覆盖了三个致密结构：20 km s^{-1}云（20MC）、50 km s^{-1}云（50MC）以及环核盘（CND）。我们的目标是利用偏振尘埃连续数据和达维斯- Chandrasekhar-Fermi方法探讨CMZ内区域的磁场形态与强度。结果显示，三个致密区域的平面面磁场均高度有序。20MC和50MC的平面面磁场强度约为1 mG，CND约为2 mG。我们比较了湍流、引力和热运动与磁场能量的贡献，分别使用等离子体β、质量-磁通比和Alfv\'en马赫数进行分析。结果表明，在CMZ内区域磁场是主要因素。磁场的主导地位可能解释了CMZ中低星形成率的现象。我们进一步通过探讨极化比与总强度之间的关系，考察了尘埃粒子对准效率。结果表明，尘埃粒子与磁场对准。
引用
@article{arxiv.2503.05198,
title = {The JCMT BISTRO Survey: Unveiling the Magnetic Fields around Galactic Center},
author = {Meng-Zhe Yang and Shih-Ping Lai and Janik Karoly and Kate Pattle and Xing Lu and David Eden and Sheng-Jun Lin and Frédérick Poidevin and Ekta Sharma and Jihye Hwang and Lapo Fanciullo and Mehrnoosh Tahani and Patrick M. Koch and Shu-ichiro Inutsuka and Valentin J. M. Le Gouellec and Hao-Yuan Duan and Jia-Wei Wang and Gary Fuller and Ray S. Furuya and Qilao Gu and Tetsuo Hasegawa and Guangxing Li and Junhao Liu and M. S. Akshaya and Bijas Najimudeen and Le Ngoc Tram and Derek Ward-Thompson and Doris Arzoumanian and James Di Francesco and Yasuo Doi and Thiem Hoang and Ji-hyun Kang and Jungmi Kwon and Woojin Kwon and Chang Won Lee and Tie Liu and Takashi Onaka and Sarah Sadavoy and Motohide Tamura and Pierre Bastien and David Berry and Simon Coudé and Keping Qiu},
journal= {arXiv preprint arXiv:2503.05198},
year = {2025}
}
备注
Accepted for publication in ApJ. 31 pages, 21 figures (20 in main text, 1 in appendix), 1 appendix