V. Belokurov
Co-formation of the disc and the stellar halo★
Belokurov, V.; Erkal, D.; Evans, NW.; Koposov, S.E.; Deason, A.J.
Abstract
Using a large sample of main sequence stars with 7D measurements supplied by Gaia and SDSS, we study the kinematic properties of the local (within ∼10 kpc from the Sun) stellar halo. We demonstrate that the halo’s velocity ellipsoid evolves strongly with metallicity. At the low-[Fe/H] end, the orbital anisotropy (the amount of motion in the radial direction compared with the tangential one) is mildly radial, with 0.2 <β< 0.4. For stars with [Fe/H] > −1.7, however, we measure extreme values of β∼ 0.9. Across the metallicity range considered, namely−3 < [Fe/H] < −1, the stellar halo’s spin is minimal, at the level of 20 1010M⊙ around the epoch of the Galactic disc formation, between 8 and 11 Gyr ago. The radical halo anisotropy is the result of the dramatic radialization of the massive progenitor’s orbit, amplified by the action of the growing disc.
Citation
Belokurov, V., Erkal, D., Evans, N., Koposov, S., & Deason, A. (2018). Co-formation of the disc and the stellar halo★. Monthly Notices of the Royal Astronomical Society, 478(1), 611-619. https://doi.org/10.1093/mnras/sty982
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 17, 2018 |
Online Publication Date | Jun 2, 2018 |
Publication Date | Jul 21, 2018 |
Deposit Date | Jun 27, 2018 |
Publicly Available Date | Jun 27, 2018 |
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 | 478 |
Issue | 1 |
Pages | 611-619 |
DOI | https://doi.org/10.1093/mnras/sty982 |
Public URL | https://durham-repository.worktribe.com/output/1328022 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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