JCMT BISTRO巡天：IC 5146中枢纽-纤维结构内的磁场
星系天体物理
2019-05-08 v3
摘要
我们展示了使用安装在詹姆斯·克拉克·麦克斯韦望远镜（JCMT）上的亚毫米波通用用户辐射热计阵列2（SCUBA-2）及其相关偏振计（POL-2），作为星形成区磁场观测（BISTRO）一部分，对IC5146纤维状云进行的850 m偏振观测。该工作旨在揭示位于秒差距尺度纤维末端、核尺度（ pc）枢纽-纤维结构（HFS）内的磁场形态。为探究观测到的偏振是否示踪HFS中的磁场，我们采用贝叶斯方法分析观测偏振分数与总强度之间的依赖关系，其中偏振分数由Rice似然函数描述，该函数可正确描述低信噪比（SNR）数据观测偏振分数的概率密度函数（PDF）。我们发现，在 20--300 mag区域，偏振分数与总强度之间存在幂律依赖，指数为0.56，表明这些致密区域中的尘埃颗粒仍可与IC5146区域的磁场对齐。我们的偏振图揭示了弯曲的磁场，可能是由沿秒差距尺度纤维的收缩所拖曳形成。我们进一步使用Davis-Chandrasekhar-Fermi方法获得朝向中央枢纽的磁场强度为0.50.2 mG，对应于质量-磁通临界值 和阿尔文马赫数0.6。这些结果表明，在当前HFS中引力与磁场重要性相当，而湍流较不重要。
引用
@article{arxiv.1812.05818,
title = {JCMT BISTRO survey: Magnetic Fields within the Hub-Filament Structure in IC 5146},
author = {Jia-Wei Wang and Shih-Ping Lai and Chakali Eswaraiah and Kate Pattle and James Di Francesco and Doug Johnstone and Patrick M. Koch and Tie Liu and Motohide Tamura and Ray S. Furuya and Takashi Onaka and Derek Ward-Thompson and Archana Soam and Kee-Tae Kim and Chang Won Lee and Chin-Fei Lee and Steve Mairs and Doris Arzoumanian and Gwanjeong Kim and Thiem Hoang and Jihye Hwang and Sheng-Yuan Liu and David Berry and Pierre Bastien and Tetsuo Hasegawa and Woojin Kwon and Keping Qiu and Philippe André and Yusuke Aso and Do-Young Byun and Huei-Ru Chen and Michael C. Chen and Wen Ping Chen and Tao-Chung Ching and Jungyeon Cho and Minho Choi and Antonio Chrysostomou and Eun Jung Chung and Simon Coudé and Yasuo Doi and C. Darren Dowell and Emily Drabek-Maunder and Hao-Yuan Duan and Stewart P. S. Eyres and Sam Falle and Lapo Fanciullo and Jason Fiege and Erica Franzmann and Per Friberg and Rachel K. Friesen and Gary Fuller and Tim Gledhill and Sarah F. Graves and Jane S. Greaves and Matt J. Griffin and Qilao Gu and Ilseung Han and Jennifer Hatchell and Saeko S. Hayashi and Wayne Holland and Martin Houde and Tsuyoshi Inoue and Shu-ichiro Inutsuka and Kazunari Iwasaki and Il-Gyo Jeong and Yoshihiro Kanamori and Ji-hyun Kang and Miju Kang and Sung-ju Kang and Akimasa Kataoka and Koji S. Kawabata and Francisca Kemper and Jongsoo Kim and Kyoung Hee Kim and Mi-Ryang Kim and Shinyoung Kim and Jason M. Kirk and Masato I. N. Kobayashi and Vera Konyves and Jungmi Kwon and Kevin M. Lacaille and Hyeseung Lee and Jeong-Eun Lee and Sang-Sung Lee and Yong-Hee Lee and Dalei Li and Di Li and Hua-bai Li and Hong-Li Liu and Junhao Liu and A-Ran Lyo and Masafumi Matsumura and Brenda C. Matthews and Gerald H. Moriarty-Schieven and Tetsuya Nagata and Fumitaka Nakamura and Hiroyuki Nakanishi and Nagayoshi Ohashi and Geumsook Park and Harriet Parsons and Enzo Pascale and Nicolas Peretto and Andy Pon and Tae-Soo Pyo and Lei Qian and Ramprasad Rao and Mark G. Rawlings and Brendan Retter and John Richer and Andrew Rigby and Jean-François Robitaille and Sarah Sadavoy and Hiro Saito and Giorgio Savini and Anna M. M. Scaife and Masumichi Seta and Hiroko Shinnaga and Ya-Wen Tang and Kohji Tomisaka and Yusuke Tsukamoto and Sven van Loo and Hongchi Wang and Anthony P. Whitworth and Hsi-Wei Yen and Hyunju Yoo and Jinghua Yuan and Hyeong-Sik Yun and Tetsuya Zenko and Chuan-Peng Zhang and Guoyin Zhang and Ya-Peng Zhang and Jianjun Zhou and Zhu},
journal= {arXiv preprint arXiv:1812.05818},
year = {2019}
}
备注
24 pages, 15 figures, accepted for publication in ApJ