The JCMT BISTRO Survey: Revealing the diverse magnetic field morphologies in Taurus dense cores with sensitive sub-millimeter polarimetry

BISTRO, Chakali Eswaraiah, Di Li, Ray S. Furuya, Tetsuo Hasegawa, Derek Ward-Thompson, Keping Qiu, Nagayoshi Ohashi, Kate Pattle, Sarah Sadavoy, Charles L. H. Hull, David Berry, Yasuo Doi, Tao-Chung Ching, Shih-Ping Lai, Jia-Wei Wang, Patrick M. Koch, Jungmi Kwon, Woojin Kwon, Pierre BastienDoris Arzoumanian, Simon Coudé, Archana Soam, Lapo Fanciullo, Hsi-Wei Yen, Junhao Liu, Thiem Hoang, Wen Ping Chen, Yoshito Shimajiri, Tie Liu, Zhiwei Chen, Hua-bai Li, A-Ran Lyo, Jihye Hwang, Doug Johnstone, Ramprasad Rao, Nguyen Bich Ngoc, Pham Ngoc Diep, Steve Mairs, Harriet Parsons, Motohide Tamura, Mehrnoosh Tahani, Huei-Ru Vivien Chen, Fumitaka Nakamura, Hiroko Shinnaga, Ya-Wen Tang, Jungyeon Cho, Chang Won Lee, Shu-ichiro Inutsuka, Antonio Chrysostomou, Tim Gledhill

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Abstract

We have obtained sensitive dust continuum polarization observations at 850 $\mu$m in the B213 region of Taurus using POL-2 on SCUBA-2 at the James Clerk Maxwell Telescope (JCMT), as part of the BISTRO (B-fields in STar-forming Region Observations) survey. These observations allow us to probe magnetic field (B-field) at high spatial resolution ($\sim$2000 au or $\sim$0.01 pc at 140 pc) in two protostellar cores (K04166 and K04169) and one prestellar core (Miz-8b) that lie within the B213 filament. Using the Davis-Chandrasekhar-Fermi method, we estimate the B-field strengths in K04166, K04169, and Miz-8b to be 38$\pm$14 $\mu$G, 44$\pm$16 $\mu$G, and 12$\pm$5 $\mu$G, respectively. These cores show distinct mean B-field orientations. B-field in K04166 is well ordered and aligned parallel to the orientations of the core minor axis, outflows, core rotation axis, and large-scale uniform B-field, in accordance with magnetically regulated star formation via ambipolar diffusion taking place in K04166. B-field in K04169 is found to be ordered but oriented nearly perpendicular to the core minor axis and large-scale B-field, and not well-correlated with other axes. In contrast, Miz-8b exhibits disordered B-field which show no preferred alignment with the core minor axis or large-scale field. We found that only one core, K04166, retains a memory of the large-scale uniform B-field. The other two cores, K04169 and Miz-8b, are decoupled from the large-scale field. Such a complex B-field configuration could be caused by gas inflow onto the filament, even in the presence of a substantial magnetic flux.
Original languageEnglish
Number of pages15
JournalAstrophysical Journal Letters
DOIs
Publication statusPublished - 10 May 2021

Keywords

  • astro-ph.GA

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