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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29106
Title: Multicomponent Kinematics in a Massive Filamentary Infrared Dark Cloud
Authors: Sokolov, Vlas
Wang, Ke
Pineda, Jaime E.
Caselli, Paola
Henshaw, Jonathan D.
Barnes, Ashley T.
Tan, Jonathan C.
FONTANI, FRANCESCO 
Jiménez-Serra, Izaskun
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 872
Issue: 1
First Page: 30
Abstract: To probe the initial conditions for high-mass star and cluster formation, we investigate the properties of dense filaments within the infrared dark cloud (IRDC) G035.39-00.33 (G035.39) in a combined Very Large Array and Green Bank Telescope mosaic tracing the NH<SUB>3</SUB> (1, 1) and (2, 2) emission down to 0.08 pc scales. Using agglomerative hierarchical clustering on multiple line-of-sight velocity component fitting results, we identify seven extended velocity-coherent components in our data, likely representing spatially coherent physical structures, some exhibiting complex gas motions. The velocity gradient magnitude distribution peaks at its mode of 0.35 and has a long tail extending into higher values of 1.5-2 , and it is generally consistent with those found toward the same cloud in other molecular tracers and with the values found toward nearby low-mass dense cloud cores at the same scales. Contrary to observational and theoretical expectations, we find the nonthermal ammonia line widths to be systematically narrower (by about 20%) than those of N<SUB>2</SUB>H<SUP>+</SUP> (1-0) line transition observed with similar resolution. If the observed ordered velocity gradients represent the core envelope solid-body rotation, we estimate the specific angular momentum to be about 2 × 10<SUP>21</SUP> cm<SUP>2</SUP> s<SUP>-1</SUP>, similar to the low-mass star-forming cores. Together with the previous finding of subsonic motions in G035.39, our results demonstrate high levels of similarity between kinematics of a high-mass star-forming IRDC and the low-mass star formation regime.
URI: http://hdl.handle.net/20.500.12386/29106
URL: https://iopscience.iop.org/article/10.3847/1538-4357/aafaff
ISSN: 0004-637X
DOI: 10.3847/1538-4357/aafaff
Bibcode ADS: 2019ApJ...872...30S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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