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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 |
Files in This Item:
File | Description | Size | Format | |
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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 |
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