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Fragmentation and dynamics of dense gas structures in the proximity of massive young stellar object W42-MME

Show simple item record Bhadari, N. K. Dewangan, L. K. Pirogov, L. E. Pazukhin, A. G. Zinchenko, I. I. Maity, A. K. Sharma, Saurabh 2024-02-02T09:24:17Z 2024-02-02T09:24:17Z 2023-12
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/1419
dc.description.abstract We present an analysis of the dense gas structures in the immediate surroundings of the massive young stellar object (MYSO) W42-MME, using the high-resolution (0 .31 × 0 .25) Atacama Large Millimetre/submillimetre Array dust continuum and molecular line data. We performed a dendrogram analysis of H13CO+ (4–3) line data to study multiscale structures and their spatio–kinematic properties, and analysed the fragmentation and dynamics of dense structures down to ∼2000 au scale. Our results reveal 19 dense gas structures, out of which 12 are leaves and 7 are branches in dendrogram terminology. These structures exhibit transonic–supersonic gas motions (1< M < 5) with overvirial states (αvir ≥ 2). The non-thermal velocity dispersion– size relation (σnt–L) of dendrogram structures shows a weak negative correlation, while the velocity dispersion across the sky (δVlsr) correlates positively with structure size (L). Velocity structure function (S2(l) 1/2) analysis of H13CO+ data reveals strong power-law dependences with lag (l) up to a scale length of 6000 au. The mass–size (M–R) relation of dendrogram structures shows a positive correlation with power-law index of 1.73 ± 0.23, and the leaf L17 hosting W42-MME meets the mass–size conditions for massive star formation. Blue asymmetry is observed in the H12CO+ (4–3) line profiles of most of the leaves, indicating infall. Overall, our results observationally support the hierarchical and chaotic collapse scenario in the proximity of the MYSO W42-MME. en_US
dc.language.iso en en_US
dc.publisher Monthly Notices of the Royal Astronomical Society en_US
dc.relation.ispartofseries 2053;mnras526-4402
dc.subject stars: massive en_US
dc.subject HII regions en_US
dc.subject ISM: jets and outflows en_US
dc.subject ISM: kinematics and dynamics en_US
dc.subject galaxies: star formation en_US
dc.title Fragmentation and dynamics of dense gas structures in the proximity of massive young stellar object W42-MME en_US
dc.type Article en_US

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