Dr Alis Deason alis.j.deason@durham.ac.uk
Associate Professor
Cresting the wave: proper motions of the Eastern Banded Structure
Deason, A.J.; Belokurov, V.; Koposo, v S.E.
Authors
V. Belokurov
v S.E. Koposo
Abstract
We study the kinematic properties of the Eastern Banded Structure (EBS) and Hydra I overdensity using exquisite proper motions derived from the Sloan Digital Sky Survey (SDSS) and Gaia source catalogue. Main sequence turn-off stars in the vicinity of the EBS are identified from SDSS photometry; we use the proper motions and, where applicable, spectroscopic measurements of these stars to probe the kinematics of this apparent stream. We find that the EBS and Hydra I share common kinematic and chemical properties with the nearby Monoceros Ring. In particular, the proper motions of the EBS, like Monoceros, are indicative of prograde rotation (Vϕ ∼ 180–220 km s−1), which is similar to the Galactic thick disc. The kinematic structure of stars in the vicinity of the EBS suggests that it is not a distinct stellar stream, but rather marks the ‘edge’ of the Monoceros Ring. The EBS and Hydra I are the latest substructures to be linked with Monoceros, leaving the Galactic anti-centre a mess of interlinked overdensities which likely share a unified, Galactic disc origin.
Citation
Deason, A., Belokurov, V., & Koposo, V. S. (2018). Cresting the wave: proper motions of the Eastern Banded Structure. Monthly Notices of the Royal Astronomical Society, 473(2), 2428-2433. https://doi.org/10.1093/mnras/stx2528
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 27, 2017 |
Online Publication Date | Sep 26, 2017 |
Publication Date | Jan 11, 2018 |
Deposit Date | Jan 15, 2018 |
Publicly Available Date | Mar 28, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 473 |
Issue | 2 |
Pages | 2428-2433 |
DOI | https://doi.org/10.1093/mnras/stx2528 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017. The Authors.
Published by Oxford University Press on behalf of the Royal Astronomical Society.
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