Orkney, Matthew D. A., Laporte, Chervin F. P., Grand, Robert J. J., Gómez, Facundo A., van de Voort, Freeke  ORCID: https://orcid.org/0000-0002-6301-638X, Fattahi, Azadeh, Marinacci, Federico, Pakmor, Rüdiger, Fragkoudi, Francesca and Springel, Volker
2023.
Exploring the diversity and similarity of radially anisotropic Milky Way-like stellar haloes: Implications for disrupted dwarf galaxy searches.
Monthly Notices of the Royal Astronomical Society
525
(1)
10.1093/mnras/stad2361
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Abstract
We investigate the properties of mergers comparable to the Gaia–Sausage–Enceladus (GSE) using cosmological hydrodynamical simulations of Milky Way-like galaxies. The merger progenitors span an order of magnitude in their peak stellar mass (3×108106M⊙ ), but most of these do not follow the merger to low orbital energies. Between 0 and 1 of these satellites may survive to z = 0, but with no clear signatures of their past association. We show that the fraction of stars originating from GSE-like mergers is reduced for lower metallicities (reaching a minimum around [Fe/H] = −2), and also within 5 kpc of the Galactic Centre. Whilst these central regions are dominated by in-situ stars, the ex-situ fraction trends towards a 100 per cent asymptote when considering the most metal-poor stars ([Fe/H] ≪ −2.5). Considering this, its near proximity, and its small volume on the sky, the Galactic Centre lends itself as a prime environment in the search for the stars from the earliest galaxies, whilst avoiding contamination from GSE stars.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Publisher: | Oxford University Press |
| ISSN: | 0035-8711 |
| Date of First Compliant Deposit: | 20 October 2023 |
| Date of Acceptance: | 28 July 2023 |
| Last Modified: | 06 Dec 2024 05:00 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/163347 |
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