Abstract / Description of output
We present an overview of, and first science results from, the
Magellanic Edges Survey (MagES), an ongoing spectroscopic survey mapping
the kinematics of red clump and red giant branch stars in the highly
substructured periphery of the Magellanic Clouds. In conjunction with Gaia
astrometry, MagES yields a sample of ~7000 stars with individual 3D
velocities that probes larger galactocentric radii than most previous
studies. We outline our target selection, observation strategy, data
reduction and analysis procedures, and present results for two fields in
the northern outskirts (>10○ on-sky from the centre) of
the Large Magellanic Cloud (LMC). One field, located in the vicinity of
an arm-like overdensity, displays apparent signatures of perturbation
away from an equilibrium disk model. This includes a large radial
velocity dispersion in the LMC disk plane, and an asymmetric
line-of-sight velocity distribution indicative of motions vertically out
of the disk plane for some stars. The second field reveals 3D
kinematics consistent with an equilibrium disk, and yields Vcirc = 87.7 ± 8.0km s−1
at a radial distance of ~10.5kpc from the LMC centre. This leads to an
enclosed mass estimate for the LMC at this radius of (1.8 ± 0.3) × 1010M⊙.
Original language | English |
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Pages (from-to) | 3055-3075 |
Number of pages | 21 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 497 |
Issue number | 3 |
Early online date | 14 Jul 2020 |
DOIs | |
Publication status | Published - 1 Sept 2020 |
Keywords / Materials (for Non-textual outputs)
- astro-ph.GA