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The 3D kinematics of gas in the small magellanic cloud


Murray, CE and Peek, JEG and Di Teodoro, EM and McClure-Griffiths, NM and Dickey, JM and Denes, H, The 3D kinematics of gas in the small magellanic cloud, Astrophysical Journal, 887, (2) pp. 1-9. ISSN 0004-637X (2019) [Refereed Article]

Copyright Statement

2019. The American Astronomical Society. All rights reserved.

DOI: doi:10.3847/1538-4357/ab510f


We investigate the kinematics of neutral gas in the Small Magellanic Cloud (SMC) and test the hypothesis that it is rotating in a disk. To trace the 3D motions of the neutral gas distribution, we identify a sample of young, massive stars embedded within it. These are stars with radial velocity measurements from spectroscopic surveys and proper motion measurements from Gaia, whose radial velocities match with dominant H I components. We compare the observed radial and tangential velocities of these stars with predictions from the state-of-the-art rotating disk model based on high-resolution 21 cm observations of the SMC from the Australian Square Kilometer Array Pathfinder telescope. We find that the observed kinematics of gas-tracing stars are inconsistent with disk rotation. We conclude that the kinematics of gas in the SMC are more complex than can be inferred from the integrated radial velocity field. As a result of violent tidal interactions with the Large Magellanic Cloud, nonrotational motions are prevalent throughout the SMC, and it is likely composed of distinct substructures overlapping along the line of sight.

Item Details

Item Type:Refereed Article
Keywords:N-body simulations, neutral hydrogen, red giants, cold gas, stream, resolution, motions, galaxy, system, field
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dickey, JM (Professor John Dickey)
ID Code:152798
Year Published:2019
Web of Science® Times Cited:8
Deposited By:Mathematics
Deposited On:2022-08-24
Last Modified:2022-09-19

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