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        Observations of magnetic fields surrounding LkHa 101 taken by the BISTRO survey with JCMT-POL-2

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        2012.04297v1.pdf (PDF, 2Mb)(embargoed until 08/02/2022)
        Author
        BISTRO
        Ngoc, Nguyen Bich
        Diep, Pham Ngoc
        Parsons, Harriet
        Pattle, Kate
        Hoang, Thiem
        Ward-Thompson, Derek
        Tram, Le Ngoc
        Hull, Charles L. H.
        Tahani, Mehrnoosh
        Furuya, Ray
        Bastien, Pierre
        Qiu, Keping
        Hasegawa, Tetsuo
        Kwon, Woojin
        Doi, Yasuo
        Lai, Shih-Ping
        Coude, Simon
        Berry, David
        Ching, Tao-Chung
        Hwang, Jihye
        Soam, Archana
        Wang, Jia-Wei
        Arzoumanian, Doris
        Bourke, Tyler L.
        Byun, Do-Young
        Chen, Huei-Ru Vivien
        Chen, Zhiwei
        Chen, Wen Ping
        Chen, Mike
        Cho, Jungyeon
        Choi, Yunhee
        Choi, Minho
        Chrysostomou, Antonio
        Chung, Eun Jung
        Dai, Sophia
        Francesco, James Di
        Duan, Yan
        Duan, Hao-Yuan
        Eden, David
        Eswaraiah, Chakali
        Fanciullo, Lapo
        Fiege, Jason
        Fissel, Laura M.
        Franzmann, Erica
        Friberg, Per
        Friesen, Rachel
        Fuller, Gary
        Gledhill, Tim
        Graves, Sarah
        Greaves, Jane
        Attention
        2299/24117
        Abstract
        We report the first high spatial resolution measurement of magnetic fields surrounding LkHa 101, part of the Auriga- California molecular cloud. The observations were taken with the POL-2 polarimeter on the James Clerk Maxwell Telescope within the framework of the B-fields In Star-forming Region Observations (BISTRO) survey. Observed polarization of thermal dust emission at 850 μm is found to be mostly associated with the redshifted gas component of the cloud. The magnetic field displays a relatively complex morphology. Two variants of the Davis-Chandrasekhar- Fermi method, unsharp masking and structure function, are used to calculate the strength of magnetic fields in the plane of the sky, yielding a similar result of BPOS~ 115 μG. The mass-to-magnetic-flux ratio in critical value units, λ~0.3, is the smallest among the values obtained for other regions surveyed by POL-2. This implies that the LkHa 101 region is subcritical, and the magnetic field is strong enough to prevent gravitational collapse. The inferred dB/B0~0.3 implies that the large-scale component of the magnetic field dominates the turbulent one. The variation of the polarization fraction with total emission intensity can be fitted by a power law with an index of a =0.82±0.03, which lies in the range previously reported for molecular clouds. We find that the polarization fraction decreases rapidly with proximity to the only early B star (LkHa 101) in the region. Magnetic field tangling and the joint effect of grain alignment and rotational disruption by radiative torques can potentially explain such a decreasing trend.
        Publication date
        2021-02-10
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4357/abd0fc
        Other links
        http://hdl.handle.net/2299/24117
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