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|Title:||Multicomponent Kinematics in a Massive Filamentary Infrared Dark Cloud||Authors:||Sokolov, Vlas
Pineda, Jaime E.
Henshaw, Jonathan D.
Barnes, Ashley T.
Tan, Jonathan C.
|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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|1812.09581.pdf||preprint||5.42 MB||Adobe PDF||View/Open|
|Sokolov_2019_ApJ_872_30.pdf||pdf editoriale||17.34 MB||Adobe PDF||View/Open|
checked on Jan 16, 2021
checked on Jan 16, 2021
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