Compressed Magnetic Field in the Magnetically Regulated Global Collapsing Clump of G9.62+0.19

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Liu , T , Kim , K-T , Liu , S-Y , Juvela , M , Zhang , Q , Wu , Y , Li , P S , Parsons , H , Soam , A , Goldsmith , P F , Su , Y-N , Tatematsu , K , Qin , S-L , Garay , G , Hirota , T , Wouterloot , J , Chen , H-R , Evans , N J , Graves , S , Kang , S-J , Li , D , Mardones , D , Rawlings , M G , Ren , Z & Wang , K 2018 , ' Compressed Magnetic Field in the Magnetically Regulated Global Collapsing Clump of G9.62+0.19 ' , Astrophysical Journal Letters , vol. 869 , no. 1 , 5 . https://doi.org/10.3847/2041-8213/aaf19e

Title: Compressed Magnetic Field in the Magnetically Regulated Global Collapsing Clump of G9.62+0.19
Author: Liu, Tie; Kim, Kee-Tae; Liu, Sheng-Yuan; Juvela, Mika; Zhang, Qizhou; Wu, Yuefang; Li, Pak Shing; Parsons, Harriet; Soam, Archana; Goldsmith, Paul F.; Su, Yu-Nung; Tatematsu, Ken'ichi; Qin, Sheng-Li; Garay, Guido; Hirota, Tomoya; Wouterloot, Jan; Chen, Huei-Ru; Evans, Neal J.; Graves, Sarah; Kang, Sung-Ju; Li, Di; Mardones, Diego; Rawlings, Mark G.; Ren, Zhiyuan; Wang, Ke
Contributor: University of Helsinki, Department of Physics
Date: 2018-12-10
Language: eng
Number of pages: 6
Belongs to series: Astrophysical Journal Letters
ISSN: 2041-8205
URI: http://hdl.handle.net/10138/279377
Abstract: How stellar feedback from high-mass stars (e.g., H II regions) influences the surrounding interstellar medium and regulates new star formation is still unclear. To address this question, we observed the G9.62+0.19 complex in 850 mu m continuum with the James Clerk Maxwell Telescope/POL-2 polarimeter. An ordered magnetic field has been discovered in its youngest clump, the G9.62 clump. The magnetic field strength is determined to be similar to 1 mG. Magnetic field plays a larger role than turbulence in supporting the clump. However, the G9.62 clump is still unstable against gravitational collapse even if thermal, turbulent, and magnetic field support are taken into account together. The magnetic field segments in the outskirts of the G9.62 clump seem to point toward the clump center, resembling a dragged-in morphology, indicating that the clump is likely undergoing magnetically regulated global collapse. However, the magnetic field in its central region is aligned with the shells of the photodissociation regions and is approximately parallel to the ionization (or shock) front, indicating that the magnetic field therein is likely compressed by the expanding H II regions that formed in the same complex.
Subject: ISM: magnetic fields
MASSIVE-STAR-FORMATION
H-II REGIONS
GEOMETRY
SCUBA-2
BORDERS
HOT
115 Astronomy, Space science
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