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The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region

Coude, S; Bastien, P; Houde, M; Sadavoy, S; Friesen, R; Di Francesco, J; Johnstone, D; ... Zhu, L; + view all (2019) The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region. Astrophysical Journal , 877 (2) , Article 88. 10.3847/1538-4357/ab1b23. Green open access

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Abstract

We present the POL-2 850 μm linear polarization map of the Barnard 1 clump in the Perseus molecular cloud complex from the B-fields In STar-forming Region Observations survey at the James Clerk Maxwell Telescope. We find a trend of decreasing polarization fraction as a function of total intensity, which we link to depolarization effects toward higher-density regions of the cloud. We then use the polarization data at 850 μm to infer the plane-of-sky orientation of the large-scale magnetic field in Barnard 1. This magnetic field runs north–south across most of the cloud, with the exception of B1-c, where it turns more east–west. From the dispersion of polarization angles, we calculate a turbulence correlation length of 5.0 ± 2farcs5 (1500 au) and a turbulent-to-total magnetic energy ratio of 0.5 ± 0.3 inside the cloud. We combine this turbulent-to-total magnetic energy ratio with observations of NH3 molecular lines from the Green Bank Ammonia Survey to estimate the strength of the plane-of-sky component of the magnetic field through the Davis–Chandrasekhar–Fermi method. With a plane-of-sky amplitude of 120 ± 60 μG and a criticality criterion λ c = 3.0 ± 1.5, we find that Barnard 1 is a supercritical molecular cloud with a magnetic field nearly dominated by its turbulent component.

Type: Article
Title: The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/ab1b23
Publisher version: https://doi.org/10.3847/1538-4357/ab1b23
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, ISM: clouds, ISM: individual objects (Barnard 1), ISM: magnetic fields, polarization, stars: formation, submillimeter: ISM, GOULD BELT SURVEY, RADIATIVE TORQUES, INTERSTELLAR GRAINS, MOLECULAR CLOUDS, POLARIZATION MEASUREMENTS, INFRARED POLARIMETRY, LINEAR-POLARIZATION, H2O MASERS, SCUBA-2, ALIGNMENT
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
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
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10078589
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