The Astrophysical Journal Letters (Jan 2024)
Magnetic Fields in Massive Star-forming Regions (MagMaR): Unveiling an Hourglass Magnetic Field in G333.46–0.16 Using ALMA
- Piyali Saha,
- Patricio Sanhueza,
- Marco Padovani,
- Josep M. Girart,
- Paulo C. Cortés,
- Kaho Morii,
- Junhao Liu,
- Á. Sánchez-Monge,
- Daniele Galli,
- Shantanu Basu,
- Patrick M. Koch,
- Maria T. Beltrán,
- Shanghuo Li,
- Henrik Beuther,
- Ian W. Stephens,
- Fumitaka Nakamura,
- Qizhou Zhang,
- Wenyu Jiao,
- M. Fernández-López,
- Jihye Hwang,
- Eun Jung Chung,
- Kate Pattle,
- Luis A. Zapata,
- Fengwei Xu,
- Fernando A. Olguin,
- Ji-hyun Kang,
- Janik Karoly,
- Chi-Yan Law,
- Jia-Wei Wang,
- Timea Csengeri,
- Xing Lu,
- Yu Cheng,
- Jongsoo Kim,
- Spandan Choudhury,
- Huei-Ru Vivien Chen,
- Charles L. H. Hull
Affiliations
- Piyali Saha
- ORCiD
- National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; [email protected], [email protected]
- Patricio Sanhueza
- ORCiD
- National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; [email protected], [email protected]; Astronomical Science Program, The Graduate University for Advanced Studies , SOKENDAI, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
- Marco Padovani
- ORCiD
- INAF-Osservatorio Astrofisico di Arcetri , Largo E. Fermi 5, 50125 Firenze, Italy
- Josep M. Girart
- ORCiD
- Institut de Ciéncies de l’Espai (ICE-CSIC) , Campus UAB, Can Magrans S/N, E-08193 Cerdanyola del Vallés, Catalonia, Spain; Institut d’Estudis Espacials de Catalunya (IEEC) , Esteve Terradas 1, PMT-UPC, E-08860 Castelldefels, Catalonia, Spain
- Paulo C. Cortés
- ORCiD
- Joint ALMA Observatory , Alonso de Córdova 3107, Vitacura, Santiago, Chile; National Radio Astronomy Observatory , 520 Edgemont Road, Charlottesville, VA 22903, USA
- Kaho Morii
- ORCiD
- National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; [email protected], [email protected]; Department of Astronomy, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Junhao Liu
- ORCiD
- National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; [email protected], [email protected]
- Á. Sánchez-Monge
- ORCiD
- Institut de Ciéncies de l’Espai (ICE-CSIC) , Campus UAB, Can Magrans S/N, E-08193 Cerdanyola del Vallés, Catalonia, Spain; Institut d’Estudis Espacials de Catalunya (IEEC) , Esteve Terradas 1, PMT-UPC, E-08860 Castelldefels, Catalonia, Spain
- Daniele Galli
- ORCiD
- INAF-Osservatorio Astrofisico di Arcetri , Largo E. Fermi 5, 50125 Firenze, Italy
- Shantanu Basu
- ORCiD
- Department of Physics and Astronomy, University of Western Ontario , London, ON N6A 3K7, Canada
- Patrick M. Koch
- ORCiD
- Academia Sinica, Institute of Astronomy and Astrophysics , Taipei, Taiwan
- Maria T. Beltrán
- ORCiD
- INAF-Osservatorio Astrofisico di Arcetri , Largo E. Fermi 5, 50125 Firenze, Italy
- Shanghuo Li
- ORCiD
- Max Planck Institute for Astronomy , Königstuhl 17, D-69117 Heidelberg, Germany
- Henrik Beuther
- ORCiD
- Max Planck Institute for Astronomy , Königstuhl 17, D-69117 Heidelberg, Germany
- Ian W. Stephens
- ORCiD
- Department of Earth, Environment, and Physics, Worcester State University , Worcester, MA 01602, USA
- Fumitaka Nakamura
- ORCiD
- National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; [email protected], [email protected]; Astronomical Science Program, The Graduate University for Advanced Studies , SOKENDAI, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; Department of Astronomy, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Qizhou Zhang
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Wenyu Jiao
- ORCiD
- Department of Astronomy, School of Physics, Peking University , Beijing, 100871, People’s Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Haidian District, Beijing 100871, People's Republic of China
- M. Fernández-López
- ORCiD
- Instituto Argentino de Radioastronomía (CCT-La Plata, CONICET; UNLP; CICPBA) , C.C. No. 5, 1894, Villa Elisa, Buenos Aires, Argentina
- Jihye Hwang
- ORCiD
- Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
- Eun Jung Chung
- ORCiD
- Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
- Kate Pattle
- ORCiD
- Department of Physics and Astronomy, University College London , Gower Street, London WC1E 6BT, UK
- Luis A. Zapata
- ORCiD
- Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México , P.O. Box 3-72, 58090, Morelia, Michoacán, Mexico
- Fengwei Xu
- ORCiD
- Department of Astronomy, School of Physics, Peking University , Beijing, 100871, People’s Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Haidian District, Beijing 100871, People's Republic of China; I. Physikalisches Institut, Universität zu Köln , Zülpicher Str. 77, D-50937 Köln, Germany
- Fernando A. Olguin
- ORCiD
- Institute of Astronomy and Department of Physics, National Tsing Hua University , Hsinchu 30013, Taiwan
- Ji-hyun Kang
- ORCiD
- Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
- Janik Karoly
- ORCiD
- Department of Physics and Astronomy, University College London , Gower Street, London WC1E 6BT, UK
- Chi-Yan Law
- ORCiD
- INAF-Osservatorio Astrofisico di Arcetri , Largo E. Fermi 5, 50125 Firenze, Italy
- Jia-Wei Wang
- ORCiD
- Institute of Astronomy and Department of Physics, National Tsing Hua University , Hsinchu 30013, Taiwan
- Timea Csengeri
- ORCiD
- Laboratoire d’astrophysique de Bordeaux, Univ. Bordeaux , CNRS, B18N, allée Geoffroy Saint-Hilaire, 33615 Pessac, France
- Xing Lu
- ORCiD
- Shanghai Astronomical Observatory, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030, People’s Republic of China
- Yu Cheng
- ORCiD
- National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; [email protected], [email protected]
- Jongsoo Kim
- ORCiD
- Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
- Spandan Choudhury
- ORCiD
- Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
- Huei-Ru Vivien Chen
- ORCiD
- Institute of Astronomy and Department of Physics, National Tsing Hua University , Hsinchu 30013, Taiwan
- Charles L. H. Hull
- ORCiD
- National Astronomical Observatory of Japan, National Institutes of Natural Sciences , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; [email protected], [email protected]
- DOI
- https://doi.org/10.3847/2041-8213/ad660c
- Journal volume & issue
-
Vol. 972,
no. 1
p. L6
Abstract
The contribution of the magnetic field to the formation of high-mass stars is poorly understood. We report the high angular resolution (∼0.″3, 870 au) map of the magnetic field projected on the plane of the sky ( B _POS ) toward the high-mass star-forming region G333.46−0.16 (G333), obtained with the Atacama Large Millimeter/submillimeter Array at 1.2 mm as part of the Magnetic fields in Massive star-forming Regions survey. The B _POS morphology found in this region is consistent with a canonical “hourglass” with an embedded flattened envelope in a perpendicular direction, which suggests a dynamically important field. This region is fragmented into two protostars that appear to be gravitationally bound in a stable binary system with a separation of ∼1740 au. Interestingly, by analyzing H ^13 CO ^+ ( J = 3–2) line emission, we find no velocity gradient over the extent of the continuum, which is consistent with a strong field. We model the B _POS , obtaining a marginally supercritical mass-to-flux ratio of 1.43, suggesting an initially strongly magnetized environment. Based on the Davis–Chandrasekhar–Fermi method, the magnetic field strength toward G333 is estimated to be 5.7 mG. The absence of strong rotation and outflows toward the central region of G333 suggests strong magnetic braking, consistent with a highly magnetized environment. Our study shows that despite being a strong regulator, the magnetic energy fails to prevent the process of fragmentation, as revealed by the formation of the two protostars in the central region.
Keywords