apjThe Astrophysical JournalAPJAstrophys. J.0004-637X1538-4357The American Astronomical Societyapjac0ce910.3847/1538-4357/ac0ce9ac0ce9AAS29678320Interstellar Matter and the Local UniverseThe JCMT BISTRO Survey: An 850/450 μm Polarization Study of NGC 2071IR in Orion B0000-0002-9907-8427LyoA-Ran10000-0002-1229-0426KimJongsoo12SadavoySarah30000-0002-6773-459XJohnstoneDoug45BerryDavid60000-0002-8557-3582PattleKate70000-0003-4022-4132KwonWoojin890000-0002-0794-3859BastienPierre100000-0002-8234-6747OnakaTakashi1112Di FrancescoJames450000-0001-7379-6263KangJi-Hyun10000-0003-0646-8782FuruyaRay13140000-0002-8975-7573HullCharles L. 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Darren39FalleSam81RobitailleJean-François82van LooSven83 Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea University of Science and Technology, Korea, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea Department for Physics, Engineering Physics and Astrophysics, Queen’s University, Kingston, ON, K7L 3N6, Canada NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 2Y2, Canada East Asian Observatory, 660 N. 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NAOJ Fellow.

92021140920211409202191828511120211762021176202117062021© 2021. The Author(s). Published by the American Astronomical Society.2021 Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.Abstract

We present the results of simultaneous 450 μm and 850 μm polarization observations toward the massive star-forming region NGC 2071IR, a target of the BISTRO (B-fields in STar-forming Region Observations) Survey, using the POL-2 polarimeter and SCUBA-2 camera mounted on the James Clerk Maxwell Telescope. We find a pinched magnetic field morphology in the central dense core region, which could be due to a rotating toroidal disklike structure and a bipolar outflow originating from the central young stellar object IRS 3. Using the modified Davis–Chandrasekhar–Fermi method, we obtain a plane-of-sky magnetic field strength of 563 ± 421 μG in the central ∼0.12 pc region from 850 μm polarization data. The corresponding magnetic energy density of 2.04 × 10−8 erg cm−3 is comparable to the turbulent and gravitational energy densities in the region. We find that the magnetic field direction is very well aligned with the whole of the IRS 3 bipolar outflow structure. We find that the median value of polarization fractions is 3.0% at 450 μm in the central 3′ region, which is larger than the median value of 1.2% at 850 μm. The trend could be due to the better alignment of warmer dust in the strong radiation environment. We also find that polarization fractions decrease with intensity at both wavelengths, with slopes, determined by fitting a Rician noise model of 0.59 ± 0.03 at 450 μm and 0.36 ± 0.04 at 850 μm, respectively. We think that the shallow slope at 850 μm is due to grain alignment at the center being assisted by strong radiation from the central young stellar objects.

unified-astronomy-thesaurushttp://astrothesaurus.org/uat/1565Star forming regions1565http://astrothesaurus.org/uat/845Interstellar magnetic fields845http://astrothesaurus.org/uat/847Interstellar medium847http://astrothesaurus.org/uat/1278Polarimetry1278ccc0004-637X/21/85+17$33.00crossmarkyes