Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements

Abstract

We present the results of dust emission polarization measurements of Ophiuchus-B (Oph-B ) carried out using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera with its associated polarimeter

(POL-2) on the James Clerk Maxwell Telescope in Hawaii. This work is part of the B-fields in Star-forming Region Observations survey initiated to understand the role of magnetic fields in star formation for nearby star-forming molecular clouds. We present a first look at the geometry and strength of magnetic fields in Oph-B. The field geometry is traced over ∼

0.2 pc, with clear detection of both of the sub-clumps of Oph-B. The

field pattern appears significantly disordered in sub-clump Oph-B1. The field geometry in Oph-B2 is more ordered, with a tendency to

be along the major axis of the clump, parallel to the filamentary structure within which it lies. The degree of polarization decreases systematically toward the dense core material in the two sub-clumps. The field lines in the lower density material along the periphery are smoothly joined to the large-scale magnetic fields probed by NIR polarization observations. We estimated a magnetic field strength of 630±410μG in the Oph-B2 sub-clump using a Davis–Chandrasekhar–Fermi analysis. With this magnetic

field strength, we find a mass-to-flux ratio λ = 1.6 ± 1.1, which suggests that the Oph-B2 clump is slightly magnetically supercritical.

Metadata

Item Type:	Article
Authors/Creators:	Soam, A Pattle, K Ward-Thompson, D Lee, CW Sadavoy, S Koch, PM Kim, G Kwon, J Kwon, W Arzoumanian, D Berry, D Hoang, T Tamura, M Lee, S-S Liu, T Kim, K-T Johnstone, D Nakamura, F Lyo, A-R Onaka, T Kim, J Furuya, RS Hasegawa, T Lai, S-P Bastien, P Chung, EJ Kim, S Parsons, H Rawlings, MG Mairs, S Graves, SF Robitaille, J-F Liu, H-L Whitworth, AP Eswaraiah, C Rao, R Yoo, H Houde, M Kang, J-H Doi, Y Choi, M Kang, M Coudé, S Li, H-B Matsumura, M Matthews, BC Pon, A Francesco, JD Hayashi, SS Kawabata, KS Inutsuka, S-I Qiu, K Franzmann, E Friberg, P Greaves, JS Kirk, JM Li, D Shinnaga, H Loo, SV https://orcid.org/0000-0003-4746-8500 Aso, Y Byun, D-Y Chen, H-R Chen, MC-Y Chen, WP Ching, T-C Cho, J Chrysostomou, A Drabek-Maunder, E Eyres, SPS Fiege, J Friesen, RK Fuller, G Gledhill, T Griffin, MJ Gu, Q Hatchell, J Holland, W Inoue, T Iwasaki, K Jeong, I-G Kang, S-J Kemper, F Kim, KH Kim, M-R Lacaille, KM Lee, J-E Li, D Liu, J Liu, S-Y Moriarty-Schieven, GH Nakanishi, H Ohashi, N Peretto, N Pyo, T-S Qian, L Retter, B Richer, J Rigby, A Savini, G Scaife, AMM Tang, Y-W Tomisaka, K Wang, H Wang, J-W Yen, H-W Yuan, J Zhang, C-P Zhang, G Zhou, J Zhu, L André, P Dowell, CD Falle, S Tsukamoto, Y Kanamori, Y Kataoka, A Kobayashi, MIN Nagata, T Saito, H Seta, M Hwang, J Han, I Lee, H Zenko, T
Copyright, Publisher and Additional Information:	© 2018, The American Astronomical Society. All rights reserved. This is an author produced version of a paper published in The Astrophysical Journal. Uploaded in accordance with the publisher's self-archiving policy
Keywords:	ISM
Dates:	Published: 3 July 2018 Published (online): 3 July 2018 Accepted: 10 May 2018
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mathematics (Leeds) > Applied Mathematics (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds)
Depositing User:	Symplectic Publications
Date Deposited:	15 Nov 2018 10:57
Last Modified:	15 Feb 2019 00:57
Status:	Published
Publisher:	American Astronomical Society
Identification Number:	10.3847/1538-4357/aac4a6
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:138671

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Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements

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