The Core Population and Kinematics of a Massive Clump at Early Stages: An Atacama Large Millimeter/submillimeter Array View
نویسندگان
چکیده
High-mass star formation theories make distinct predictions on the properties of prestellar seeds high-mass stars. Observations early stages can provide crucial constraints, but they are challenging and scarce. We investigate core population embedded in clump AGAL014.492-00.139, we study kinematics at clump-to-core scales. have analysed an extensive dataset acquired with ALMA interferometer. Applying a dendrogram analysis to Band o-$\rm H_2D^+$ data, identified 22 cores. fitted their average spectra local-thermodinamic-equilibrium conditions, continuum emission $0.8 \, \rm mm$. The cores transonic mildly supersonic turbulence levels appear mostly low-mass, $M_\mathrm{core}< 30 M_\odot$. Furthermore, 3 observations $\rm N_2H^+$ (1-0) transition, which traces large scale gas kinematics. Using friend-of-friend algorithm, identify four main velocity coherent structures, all associated protostellar One them presents filament-like structure, our could be consistent mass accretion towards one protostars. In this case, estimate rate $ \dot{M}_\mathrm{acc}\approx 2 \times 10^{-4} M_\odot yr^{-1}$. Our results support clump-fed scenario targeted source. stage essentially subvirial gravitationally bound, unless further is available for instance due magnetic fields.
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2022
ISSN: ['2041-8213', '2041-8205']
DOI: https://doi.org/10.3847/1538-4357/ac85b4