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- W3105847086 abstract "We study the gas kinematics and dynamics of the massive protocluster G286.21+0.17 with the Atacama Large Millimeter/submillimeter Array using spectral lines of C18O(2–1), (3–2), (3–2), and (3–2). On the parsec clump scale, C18O emission appears highly filamentary around the systemic velocity, and are more closely associated with the dust continuum, and is strongly concentrated toward the protocluster center, where no or only weak detection is seen for and , possibly due to this region being at a relatively evolved evolutionary stage. Spectra of 76 continuum-defined dense cores, typically a few 1000 au in size, are analyzed to measure their centroid velocities and internal velocity dispersions. There are no statistically significant velocity offsets of the cores among the different dense gas tracers. Furthermore, the majority (71%) of the dense cores have subthermal velocity offsets with respect to their surrounding, lower-density C18O-emitting gas. Within the uncertainties, the dense cores in G286 show internal kinematics that are consistent with being in virial equilibrium. On clump scales, the core-to-core velocity dispersion is also similar to that required for virial equilibrium in the protocluster potential. However, the distribution in velocity of the cores is largely composed of two spatially distinct groups, which indicates that the dense molecular gas has not yet relaxed to virial equilibrium, perhaps due to there being recent/continuous infall into the system." @default.
- W3105847086 created "2020-11-23" @default.
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- W3105847086 date "2020-05-08" @default.
- W3105847086 modified "2023-10-16" @default.
- W3105847086 title "Gas Kinematics of the Massive Protocluster G286.21+0.17 Revealed by ALMA" @default.
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- W3105847086 doi "https://doi.org/10.3847/1538-4357/ab879f" @default.
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