Pattle, Kate;
Lai, Shih-Ping;
Sadavoy, Sarah;
Coudé, Simon;
Wolf, Sebastian;
Furuya, Ray;
Kwon, Woojin;
... Zielinski, Niko; + view all
(2022)
Magnetic fields and outflows in the large Bok globule CB 54.
Monthly Notices of the Royal Astronomical Society
, 515
(1)
pp. 1026-1036.
10.1093/mnras/stac1356.
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Abstract
We have observed the large Bok globule CB 54 in 850 μm polarised light using the POL-2 polarimeter on the James Clerk Maxwell Telescope (JCMT). We find that the magnetic field in the periphery of the globule shows significant, ordered deviation from the mean field direction in the globule centre. This deviation appears to correspond with the extended but relatively weak 12CO outflow emanating from the Class 0 sources at the centre of the globule. Energetics analysis suggests that if the outflow is reshaping the magnetic field in the globule’s periphery, then we can place an upper limit of <27μG on the magnetic field strength in the globule’s periphery. Comparison with archival Planck and CARMA measurements shows that the field in the centre of the globule is consistent over several orders of magnitude in size scale, and oriented parallel to the density structure in the region in projection. We thus hypothesise that while non-thermal motions in the region may be sub-Alfvénic, the magnetic field is subdominant to gravity over a wide range of size scales. Our results suggest that even a relatively weak outflow may be able to significantly reshape magnetic fields in star-forming regions on scales >0.1 pc.
| Type: | Article |
|---|---|
| Title: | Magnetic fields and outflows in the large Bok globule CB 54 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stac1356 |
| Publisher version: | https://doi.org/10.1093/mnras/stac1356 |
| Language: | English |
| Additional information: | Copyright © The Author(s) 2022. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | stars: formation, ISM: magnetic fields, submillimetre: ISM |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10148788 |
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