The Magellanic Edges Survey I: Description and first results

L. R. Cullinane; A. D. Mackey; G. S. Da Costa; S. E. Koposov; V Belokurov; D. Erkal; A. Koch; A. Kunder; D. M. Nataf

doi:10.1093/mnras/staa2048

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The Magellanic Edges Survey I: Description and first results

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The Magellanic Edges Survey I: Description and first results

L. R. Cullinane, A. D. Mackey, G. S. Da Costa, S. E. Koposov, V Belokurov, D. Erkal, A. Koch, A. Kunder and D. M. Nataf

Monthly notices of the Royal Astronomical Society, Vol.497(3), pp.3055-3075

09/01/2020

DOI: 10.1093/mnras/staa2048

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https://www.research.ed.ac.uk/en/publications/285e5178-2fbd-4254-be0f-e7add50ddd16View

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Abstract

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 similar to 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 degrees 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 disc model. This includes a large radial velocity dispersion in the LMC disc plane, and an asymmetric line-of-sight velocity distribution indicative of motions vertically out of the disc plane for some stars. The second field reveals 3D kinematics consistent with an equilibrium disc, and yields V-circ = 87.7 +/- 8.0 km s(-1) at a radial distance of similar to 10.5 kpc from the LMC centre. This leads to an enclosed mass estimate for the LMC at this radius of (1.8 +/- 0.3) x 10(10) M-circle dot.

Physical Sciences

Astronomy & Astrophysics

Science & Technology

Details

Title: Subtitle: The Magellanic Edges Survey I: Description and first results
Creators: L. R. Cullinane - Australian National University
A. D. Mackey - Australian National University
G. S. Da Costa - Australian National University
S. E. Koposov - University of Cambridge
V Belokurov - University of Cambridge
D. Erkal - Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England
A. Koch - Heidelberg University
A. Kunder - Saint Martin's University
D. M. Nataf - Johns Hopkins University
Resource Type: Journal article
Publication Details: Monthly notices of the Royal Astronomical Society, Vol.497(3), pp.3055-3075
DOI: 10.1093/mnras/staa2048
ISSN: 0035-8711
eISSN: 1365-2966
Publisher: Oxford Univ Press
Number of pages: 21
Grant note: 2018-1030 / Heising-Simons foundation 80NSSC19K0589 / National Aeronautics and Space Administration (NASA); National Aeronautics & Space Administration (NASA) 138713538 -SFB 881 / Deutsche Forschungsgemeinschaft (DFG; German Research Foundation); German Research Foundation (DFG) AST-1813881; AST1909584 / National Science Foundation (NSF) DP150103294 / Australian Research Council (ARC); Australian Research Council FT160100206 / ARCFuture Fellowship; Australian Research Council
Language: English
Date published: 09/01/2020
Academic Unit: Physics and Astronomy
Record Identifier: 9984701825302771

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