Multicomponent Kinematics in a Massive Filamentary Infrared Dark Cloud

Sokolov, V., Wang, K., Pineda, J. E., Caselli, P., Henshaw, J. D., Barnes, A. T., Tan, J. C., Fontani, F., Jiménez Serra, I. 2019. Multicomponent Kinematics in a Massive Filamentary Infrared Dark Cloud. Astrophysical Journal 872, 1, DOI: 10.3847/1538-4357/aafaff

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 NH3 (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 km s(-1) pc(-1) and has a long tail extending into higher values of 1.5-2 km s(-1) pc(-1), 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 N2H+ (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. x. 10(21) cm(2) s(-1), 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.

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