ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions – V. Hierarchical fragmentation and gas dynamics in IRDC G034.43+00.24

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Liu , H-L , Tej , A , Liu , T , Issac , N , Saha , A , Goldsmith , P F , Wang , J-Z , Zhang , Q , Qin , S-L , Wang , K , Li , S , Soam , A , Dewangan , L , Lee , C W , Li , P-S , Liu , X-C , Zhang , Y , Ren , Z , Juvela , M , Bronfman , L , Wu , Y-F , Tatematsu , K , Chen , X , Li , D , Stutz , A , Zhang , S , Tóth , L V , Luo , Q-Y , Xu , F-W , Li , J , Liu , R , Zhou , J , Zhang , C , Tang , M , Zhang , C , Baug , T , Mannfors , E E , Chakali , E & Dutta , S 2022 , ' ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions – V. Hierarchical fragmentation and gas dynamics in IRDC G034.43+00.24 ' , Monthly Notices of the Royal Astronomical Society , vol. 510 , no. 4 , pp. 5009-5022 . https://doi.org/10.1093/mnras/stab2757

Title: ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions – V. Hierarchical fragmentation and gas dynamics in IRDC G034.43+00.24
Author: Liu, Hong-Li; Tej, Anandmayee; Liu, Tie; Issac, Namitha; Saha, Anindya; Goldsmith, Paul F.; Wang, Jun-Zhi; Zhang, Qizhou; Qin, Sheng-Li; Wang, Ke; Li, Shanghuo; Soam, Archana; Dewangan, Lokesh; Lee, Chang Won; Li, Pak-Shing; Liu, Xun-Chuan; Zhang, Yong; Ren, Zhiyuan; Juvela, Mika; Bronfman, Leonardo; Wu, Yue-Fang; Tatematsu, Ken'ichi; Chen, Xi; Li, Di; Stutz, Amelia; Zhang, Siju; Tóth, L. Viktor; Luo, Qiu-Yi; Xu, Feng-Wei; Li, Jinzeng; Liu, Rong; Zhou, Jianwen; Zhang, Chao; Tang, Mengyao; Zhang, Chao; Baug, Tapas; Mannfors, Emma Elisa; Chakali, Eswaraiah; Dutta, Somnath
Contributor organization: Department of Physics
Particle Physics and Astrophysics
Date: 2022-01-20
Language: eng
Number of pages: 14
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stab2757
URI: http://hdl.handle.net/10138/339339
Abstract: We present new 3-mm continuum and molecular lines observations from the ATOMS survey towards the massive protostellar clump, MM1, located in the filamentary infrared dark cloud (IRDC), G034.43+00.24 (G34). The lines observed are the tracers of either dense gas (e.g. HCO+/(HCO+)-C-13 J= 1-0) or outflows (e.g. CS J = 2-1). The most complete picture to date of seven cores in MM1 is revealed by dust continuum emission. These cores are found to be gravitationally bound, with virial parameter, alpha(vir) < 2. At least four outflows are identified in MM1 with a total outflowing mass of similar to 45 M-circle dot, and a total energy of 1 x 10(47) erg, typical of outflows from a B0-type star. Evidence of hierarchical fragmentation, where turbulence dominates over thermal pressure, is observed at both the cloud and the clump scales. This could be linked to the scale-dependent, dynamical mass inflow/accretion on clump and core scales. We therefore suggest that the G34 cloud could be undergoing a dynamical mass inflow/accretion process linked to the multiscale fragmentation, which leads to the sequential formation of fragments of the initial cloud, clumps, and ultimately dense cores, the sites of star formation.
Subject: 115 Astronomy, Space science
stars: formation
stars: kinematics and dynamics
ISM: clouds
ISM: individual objects: G034.43+00.24
MOLECULAR OUTFLOWS
MAGNETIC-FIELDS
CLUMPS
PROTOSTARS
ACCRETION
COLLAPSE
DRIVEN
DENSE
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion


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