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- W4387442029 abstract "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) ALMA dust continuum and molecular line data. We performed a dendrogram analysis of H13CO+ (4–3) line data to study multi-scale structures and their spatio-kinematic properties, and analyzed 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$<mathcal {M}<5$) 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 ($delta mathit {V_{rm lsr}}$) correlates positively with structure size (L). Velocity structure function (S2(l)1/2) analysis of H13CO+ data reveals strong power-law dependencies 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." @default.
- W4387442029 created "2023-10-10" @default.
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- W4387442029 date "2023-10-09" @default.
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- W4387442029 title "Fragmentation and dynamics of dense gas structures in the proximity of massive young stellar object W42-MME" @default.
- W4387442029 doi "https://doi.org/10.1093/mnras/stad2981" @default.
- W4387442029 hasPublicationYear "2023" @default.
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