Observations of Magnetic Fields Surrounding LkH alpha 101 Taken by the BISTRO Survey with JCMT-POL-2
Artikel i vetenskaplig tidskrift, 2021
We report the first high spatial resolution measurement of magnetic fields surrounding LkH alpha 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 mu m 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 B-POS similar to 115 mu G. The mass-to-magnetic-flux ratio in critical value units, lambda similar to 0.3, is the smallest among the values obtained for other regions surveyed by POL-2. This implies that the LkH alpha 101 region is subcritical, and the magnetic field is strong enough to prevent gravitational collapse. The inferred delta B/B-0 similar to 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 alpha = 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 (LkH alpha 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.
Interstellar magnetic fields
Molecular clouds
Star formation
Författare
Nguyen Bich Ngoc
Vietnam Academy of Science and Technology
Pham Ngoc Diep
Vietnam Academy of Science and Technology
Harriet Parsons
East Asian Observatory
Kate Pattle
National University of Ireland Galway
Thiem Hoang
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Derek Ward-Thompson
University of Central Lancashire
Le Ngoc Tram
Vietnam Academy of Science and Technology
Charles L. H. Hull
National Astronomical Observatory of Japan
Atacama Large Millimeter-submillimeter Array (ALMA)
Mehrnoosh Tahani
National Research Council Canada
Ray Furuya
Tokushima University
Pierre Bastien
National Research Council Canada
Université de Montréal
Keping Qiu
Nanjing University
Tetsuo Hasegawa
National Astronomical Observatory of Japan
Woojin Kwon
Seoul National University
Yasuo Doi
University of Tokyo
Shih-Ping Lai
Academia Sinica
National Tsing Hua University
Simon Coude
National Aeronautics and Space Administration (NASA)
David Berry
East Asian Observatory
Tao-Chung Ching
Chinese Academy of Sciences
Jihye Hwang
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Archana Soam
National Aeronautics and Space Administration (NASA)
Jia-Wei Wang
Academia Sinica
Doris Arzoumanian
Universidade do Porto
Tyler L. Bourke
University of Manchester
SKA Organisation
Do-Young Byun
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Huei-Ru Vivien Chen
National Tsing Hua University
Academia Sinica
Zhiwei Chen
Chinese Academy of Sciences
Wen Ping Chen
National Central University
Mike Chen
University of Victoria
Jungyeon Cho
Chungnam National University
Yunhee Choi
Korea Astronomy and Space Science Institute
Minho Choi
Korea Astronomy and Space Science Institute
Antonio Chrysostomou
University of Hertfordshire
Eun Jung Chung
Chungnam National University
Sophia Dai
Chinese Academy of Sciences
James Di Francesco
National Research Council Canada
University of Victoria
Yan Duan
Chinese Academy of Sciences
Hao-Yuan Duan
National Tsing Hua University
David Eden
Liverpool John Moores University
Chakali Eswaraiah
Chinese Academy of Sciences
Lapo Fanciullo
Academia Sinica
Jason Fiege
University of Manitoba
Laura M. Fissel
Queen's University
Erica Franzmann
University of Manitoba
Per Friberg
National Radio Astronomy Observatory
Rachel Friesen
National Radio Astronomy Observatory
Gary Fuller
University of Manchester
Tim Gledhill
University of Hertfordshire
Sarah Graves
East Asian Observatory
Jane Greaves
Cardiff University
Matt Griffin
Cardiff University
Qilao Gu
Chinese University of Hong Kong
Ilseung Han
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Jennifer Hatchell
University of Exeter
Saeko Hayashi
National Astronomical Observatory of Japan
Martin Houde
Western University
Tsuyoshi Inoue
Nagoya University
Shu-ichiro Inutsuka
Nagoya University
Kazunari Iwasaki
Doshisha University
Il-Gyo Jeong
Korea Astronomy and Space Science Institute
Doug Johnstone
University of Victoria
National Research Council Canada
Ji-hyun Kang
Korea Astronomy and Space Science Institute
Sung-ju Kang
Korea Astronomy and Space Science Institute
Miju Kang
Korea Astronomy and Space Science Institute
Akimasa Kataoka
National Astronomical Observatory of Japan
Koji Kawabata
Hiroshima University
Francisca Kemper
European Southern Observatory Santiago
Academia Sinica
Kee-Tae Kim
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Jongsoo Kim
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Tae-Soo Pyo
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
Lei Qian
Chinese Academy of Sciences
Ramprasad Rao
Academia Sinica
Mark Rawlings
East Asian Observatory
Jonathan Rawlings
University College London (UCL)
Brendan Retter
Cardiff University
John Richer
University of Cambridge
Andrew Rigby
Cardiff University
Sarah Sadavoy
Queen's University
Hiro Saito
University of Tsukuba
Giorgio Savini
University College London (UCL)
Kwansei Gakuin University
Anna Scaife
University of Manchester
Masumichi Seta
National Astronomical Observatory of Japan
Kwansei Gakuin University
Gwanjeong Kim
National Astronomical Observatory of Japan
Tohoku University
Shinyoung Kim
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Kyoung Hee Kim
Korea Astronomy and Space Science Institute
Mi-Ryang Kim
Korea Astronomy and Space Science Institute
Florian Kirchschlager
University College London (UCL)
Jason Kirk
University of Central Lancashire
Masato I. N. Kobayashi
Tohoku University
University of Tokyo
Patrick M. Koch
Academia Sinica
Vera Konyves
University of Central Lancashire
Takayoshi Kusune
National Astronomical Observatory of Japan
Jungmi Kwon
McMaster University
University of Tokyo
Kevin Lacaille
Dalhousie University
McMaster University
Chi Yan Law
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Sang-Sung Lee
University of Science and Technology (UST)
Korea Astronomy and Space Science Institute
Yong-Hee Lee
Kyung Hee University
Chinese Academy of Sciences
Chin-Fei Lee
Academia Sinica
Jeong-Eun Lee
Chinese Academy of Sciences
Kyung Hee University
Hyeseung Lee
Chungnam National University
Chang Won Lee
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Di Li
Chinese Academy of Sciences
University of KwaZulu-Natal
Hua-bai Li
Chinese University of Hong Kong
Dalei Li
Chinese Academy of Sciences
Hong-Li Liu
Universidad de Concepción
Yunnan University
Junhao Liu
Nanjing University
Tie Liu
Chinese Academy of Sciences
Sheng-Yuan Liu
Academia Sinica
Xing Lu
National Astronomical Observatory of Japan
A-Ran Lyo
Korea Astronomy and Space Science Institute
Steve Mairs
Kagawa University
Masafumi Matsumura
Kagawa University
Brenda Matthews
University of Victoria
National Research Council Canada
Gerald Moriarty-Schieven
National Research Council Canada
Tetsuya Nagata
Kyoto University
Fumitaka Nakamura
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
Hiroyuki Nakanishi
Kagoshima University
Nagayoshi Ohashi
National Astronomical Observatory of Japan
Takashi Onaka
Meisei University
McMaster University
University of Tokyo
Geumsook Park
Korea Astronomy and Space Science Institute
Nicolas Peretto
Cardiff University
Yoshito Shimajiri
National Astronomical Observatory of Japan
Hiroko Shinnaga
Kagoshima University
Motohide Tamura
University of Tokyo
National Astronomical Observatory of Japan
McMaster University
National Institutes of Natural Sciences
Ya-Wen Tang
Academia Sinica
Xindi Tang
Chinese Academy of Sciences
Kohji Tomisaka
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Yusuke Tsukamoto
Kagoshima University
Serena Viti
University College London (UCL)
Hongchi Wang
Chinese Academy of Sciences
Anthony Whitworth
Cardiff University
Jinjin Xie
Chinese Academy of Sciences
Hsi-Wei Yen
Academia Sinica
Hyunju Yoo
Korea Astronomy and Space Science Institute
Jinghua Yuan
Chinese Academy of Sciences
Hyeong-Sik Yun
Chinese Academy of Sciences
Kyung Hee University
Tetsuya Zenko
Kyoto University
Yapeng Zhang
Chinese University of Hong Kong
Chuan-Peng Zhang
Chinese Academy of Sciences
Guoyin Zhang
Chinese Academy of Sciences
Jianjun Zhou
Chinese Academy of Sciences
Lei Zhu
Chinese Academy of Sciences
Ilse de Looze
University College London (UCL)
Philippe Andre
Université Paris Diderot
C. Darren Dowell
California Institute of Technology (Caltech)
Stewart Eyres
University of South Wales
Sam Falle
University of Leeds
Jean-Francois Robitaille
Université Grenoble Alpes
Sven van Loo
University of Leeds
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 908 1 10Ämneskategorier (SSIF 2011)
Meteorologi och atmosfärforskning
Astronomi, astrofysik och kosmologi
Fusion, plasma och rymdfysik
DOI
10.3847/1538-4357/abd0fc