基于 SCUBA-2 偏振测量的蛇夫座-B 磁场
星系天体物理
2018-07-18 v2
摘要
我们展示了利用位于夏威夷的詹姆斯·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）相机及其配套偏振计（POL-2）对蛇夫座-B（Oph-B）进行的尘埃发射偏振测量结果。该工作是由旨在理解磁场在邻近恒星形成分子云的恒星形成中所起作用而发起的星形成区磁场观测（BISTRO）巡天的一部分。我们首次展示了 Oph-B 中磁场的几何形态与强度。磁场几何形态在 0.2 pc 尺度上被追踪，并清晰探测到 Oph-B 的两个子团块。在子团块 Oph-B1 中，磁场图样明显无序。Oph-B2 中的磁场几何形态更为有序，倾向于沿团块主轴方向，平行于其所处的纤维状结构。在两个子团块中，偏振度朝致密核物质方向系统性降低。低密度物质中沿边缘的磁力线与近红外偏振观测所探测到的大尺度磁场平滑衔接。我们利用 Davis-Chandrasekhar-Fermi 分析估算出 Oph-B2 子团块中的磁场强度为 630410 G。基于该磁场强度，我们得到质量-磁通量比 = 1.61.1，表明 Oph-B2 团块略微处于磁超临界状态。
引用
@article{arxiv.1805.06131,
title = {Magnetic fields towards Ophiuchus-B derived from SCUBA-2 polarization measurements},
author = {Archana Soam and Kate Pattle and Derek Ward-Thompson and Chang Won Lee and Sarah Sadavoy and Patrick M. Koch and Gwanjeong Kim and Jungmi Kwon and Woojin Kwon and Doris Arzoumanian and David Berry and Thiem Hoang and Motohide Tamura and Sang-Sung Lee and Tie Liu and Kee-Tae Kim and Doug Johnstone and Fumitaka Nakamura and A-Ran Lyo and Takashi Onaka and Jongsoo Kim and Ray S. Furuya and Tetsuo Hasegawa and Shih-Ping Lai and Pierre Bastien and Eun Jung Chung and Shinyoung Kim and Harriet Parsons and Mark Rawlings and Steve Mairs and Sarah F. Graves and J. -F. Robitaille and Hong-Li Liu and Anthony P. Whitworth and Chakali Eswaraiah and Ramprasad Rao and Hyunju Yoo and Martin Houde and Ji-hyun Kang and Yasuo Doi and Minho Choi and Miju Kang and Simon Coude and Hua-bai Li and Masafumi Matsumura and Brenda C. Matthews and Andy Pon and James Di Francesco and Saeko S. Hayashi and Koji S. Kawabata and Shu-ichiro Inutsuka and Keping Qiu and Erica Franzmann and Per Friberg and Jane S. Greaves and Jason M. Kirk and Di Li and Hiroko Shinnaga and Sven van Loo and Yusuke Aso and Do-Young Byun and Huei-Ru Chen and Mike C. -Y. Chen and Wen Ping Chen and Tao-Chung Ching and Jungyeon Cho and Antonio Chrysostomou and Emily Drabek-Maunder and Stewart P. S. Eyres and Jason Fiege and Rachel K. Friesen and Gary Fuller and Tim Gledhill and Matt J. Griffin and Qilao Gu and Jennifer Hatchell and Wayne Holland and Tsuyoshi Inoue and Kazunari Iwasaki and Il-Gyo Jeong and Sung-ju Kang and Francisca Kemper and Kyoung Hee Kim and Mi-Ryang Kim and Kevin M. Lacaille and Jeong-Eun Lee and Dalei Li and Junhao Liu and Sheng-Yuan Liu and Gerald H. Moriarty-Schieven and Hiroyuki Nakanishi and Nagayoshi Ohashi and Nicolas Peretto and Tae-Soo Pyo and Lei Qian and Brendan Retter and John Richer and Andrew Rigby and Giorgio Savini and Anna M. M. Scaife and Ya-Wen Tang and Kohji Tomisaka and Hongchi Wang and Jia-Wei Wang and Hsi-Wei Yen and Jinghua Yuan and Chuan-Peng Zhang and Guoyin Zhang and Jianjun Zhou and Lei Zhu and Philippe Andre and C. Darren Dowell and Sam Falle and Yusuke Tsukamoto and Yoshihiro Kanamori and Akimasa Kataoka and Masato I. N. Kobayashi and Tetsuya Nagata and Hiro Saito and Masumichi Seta and Jihye Hwang and Ilseung Han and Hyeseung Lee and Tetsuya Zenko},
journal= {arXiv preprint arXiv:1805.06131},
year = {2018}
}
备注
17 pages, 10 figures, Accepted for publication in ApJ