Internal dynamics of the Large Magellanic Cloud from Gaia DR2
Open Access
- 5 September 2018
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society: Letters
- Vol. 481 (1) , L100-L104
Abstract
We use the proper motions (PM) of half a million red giant stars in the Large Magellanic Cloud measured by Gaia to construct a 2D kinematic map of mean PM and its dispersion across the galaxy, out to 7 kpc from its centre. We then explore a range of dynamical models and measure the rotation curve, mean azimuthal velocity, velocity dispersion profiles, and the orientation of the galaxy. We find that the circular velocity reaches ∼90 km s−1 at 5 kpc, and that the velocity dispersion ranges from ∼30–40 km s−1 in the galaxy centre to ∼15–20 km s−1 at 7 kpc.Keywords
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Funding Information
- European Research Council (308024)
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