A First Look at BISTRO Observations of the ρ Oph-A core

Abstract

We present 850 μm imaging polarimetry data of the ρ Oph-A core taken with the Submillimeter Common-User Bolometer Array-2 (SCUBA-2) and its polarimeter (POL-2) as part of our ongoing survey project, B-fields In STar forming RegiOns (BISTRO). The polarization vectors are used to identify the orientation of the magnetic field projected on the plane of the sky at a resolution of 0.01 pc. We identify 10 subregions with distinct polarization fractions and angles in the 0.2 pc ρ Oph-A core; some of them can be part of a coherent magnetic field structure in the ρ Oph region. The results are consistent with previous observations of the brightest regions of ρ Oph-A, where the degrees of polarization are at a level of a few percent, but our data reveal for the first time the magnetic field structures in the fainter regions surrounding the core where the degree of polarization is much higher (>5%). A comparison with previous near-infrared polarimetric data shows that there are several magnetic field components that are consistent at near-infrared and submillimeter wavelengths. Using the Davis–Chandrasekhar–Fermi method, we also derive magnetic field strengths in several subcore regions, which range from approximately 0.2 to 5 mG. We also find a correlation between the magnetic field orientations projected on the sky and the core centroid velocity components.

Metadata

Item Type:	Article
Authors/Creators:	Kwon, J Doi, Y Tamura, M Matsumura, M Pattle, K Berry, D Sadavoy, S Matthews, BC Ward-Thompson, D Hasegawa, T Furuya, RS Pon, A Di Francesco, J Arzoumanian, D Hayashi, SS Kawabata, KS Onaka, T Choi, M Kang, M Hoang, T Lee, CW Lee, S-S Liu, H-L Liu, T Inutsuka, S-I Eswaraiah, C Bastien, P Kwon, W Lai, S-P Qiu, S Coudé, S Franzmann, E Friberg, P Graves, SF Greaves, JS Houde, M Johnstone, D Kirk, JM Koch, PM Li, D Parsons, H Rao, R Rawlings, MG Shinnaga, H Van Loo, S 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 Chung, EJ 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, J-H Kang, S-J Kemper, F Kim, G Kim, J Kim, K-T Kim, KH Kim, M-R Kim, S Lacaille, KM Lee, J-E Li, D Li, H-B Liu, J Liu, S-Y Lyo, A-R Mairs, S Moriarty-Schieven, GH Nakamura, F Nakanishi, H Ohashi, N Peretto, N Pyo, T-S Qian, L Retter, B Richer, J Rigby, A Robitaille, J-F Savini, G Scaife, AMM Soam, A Tang, Y-W Tomisaka, K Wang, H Wang, J-W Whitworth, AP Yen, H-W Yoo, H Yuan, J Zhang, C-P Zhang, G Zhou, J Zhu, L André, P Dowell, CD Falle, S Tsukamoto, Y Nakagawa, T Kanamori, Y Kataoka, A Kobayashi, MIN Nagata, T Saito, H Seta, M 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:	circumstellar matter; ISM: individual objects (Ophiuchi); ISM: structure; polarization; radio continuum: ISM; stars: formation
Dates:	Published: 20 May 2018 Published (online): 16 May 2018 Accepted: 26 March 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)
Funding Information:	Funder Grant number Science & Technology Facilities Council (STFC) ST/P00041X/1
Depositing User:	Symplectic Publications
Date Deposited:	30 Apr 2018 12:17
Last Modified:	06 Jun 2018 12:00
Status:	Published
Publisher:	American Astronomical Society
Identification Number:	10.3847/1538-4357/aabd82
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:130205

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A First Look at BISTRO Observations of the ρ Oph-A core

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