Tools
Tools
Dillamore, AM, Belokurov, V, Evans, NW and Font, AS (2022) A correlation between accreted stellar kinematics and dark matter halo spin in the ARTEMIS simulations. Monthly Notices of the Royal Astronomical Society: Letters, 519 (1). L87-L91. ISSN 1745-3925
|
Text
A correlation between accreted stellar kinematics and dark-matter halo spin in the ARTEMIS simulations.pdf - Published Version Download (872kB) | Preview |
Abstract
We report a correlation between the presence of a Gaia-Sausage-Enceladus (GSE) analogue and dark matter halo spin in the ARTEMIS simulations of Milky Way-like galaxies. The haloes which contain a large population of accreted stars on highly radial orbits (like the GSE) have lower spin on average than their counterparts with more isotropic stellar velocity distributions. The median modified spin parameters λ′ differ by a factor of ∼1.7 at the present-day, with a similar value when the haloes far from virial equilibrium are removed. We also show that accreted stars make up a smaller proportion of the stellar populations in haloes containing a GSE analogue, and are stripped from satellites with stellar masses typically ∼4 times smaller. Our findings suggest that the higher spin of DM haloes without a GSE-like feature is due to mergers with large satellites of stellar mass ∼1010M⊙, which do not result in prominent radially anisotropic features like the GSE.
| Item Type: | Article |
|---|---|
| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences |
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press (OUP) |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 04 Jan 2023 14:37 |
| Last Modified: | 04 Jan 2023 14:45 |
| DOI or ID number: | 10.1093/mnrasl/slac158 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/18535 |
 |
View Item |