Cresting the wave: proper motions of the Eastern Banded Structure
Open accessAbstract
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.
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Research works printed but not linked: 1
- de Boer T. J. L., Belokurov V., Koposov S. E., 2017, MNRAS, preprint (arXiv:1706.09468) · arXiv
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Kruijssen, J. M. D., Pfeffer, J. L., Chevance, M., Bonaca, A., Trujillo-Gomez, S., Bastian, N., Reina-Campos, M., Crain, R. A., & Hughes, M. E. (2020) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/staa2452 · Cited by 252 · see citing works
“…in a large number of GCs, many of which were formerly associated with the Canis Major ‘mirage’, a perceived accretion event that never existed and rather represents a density wave in the Galactic disc (e.g. Martin et al. 2004; Peñarrubia et al. 2005; Deason et al. 2018; de Boer et al. 2018).”
Background
- Authors
- Deason, A. J., Belokurov, V., & Koposov, S. E.
- Affiliations
- Durham University (GB)
- University of Cambridge (GB)
- Corresponding author
- Deason, Alis J.
- Venue
- Monthly Notices of the Royal Astronomical Society
- Publisher
- Oxford University Press (OUP)
- Published
- 2017-09-27
- Volume
- 473
- Issue
- 2
- Pages
- 2428-2433
- ISSN
- 0035-8711 (ISSN-L)
- 1365-2966
- OpenAlex
- W2758892404
- Cited by
- 22
- References
- 32
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 3 · 2021: 1 · 2020: 4 · 2019: 4 · 2018: 8
- FWCI
- 2.39
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Monthly Notices of the Royal Astronomical Society (publishedVersion)
- Durham Research Online (Durham University) (acceptedVersion)
- arXiv (Cornell University) (submittedVersion)
- Durham Research Online (Durham University) (submittedVersion, cc-by)
- Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, other-oa)
- arXiv (Cornell University)
- Funders
- Seventh Framework Programme (308024)
- STFC (ST/P000541/1, ST/N004493/1)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Keywords
- Monoceros Ring, stellar streams, proper motions, prograde rotation, Galactic thick disc, stellar substructures, main-sequence turnoff stars
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