Exploring the diversity and similarity of radially anisotropic Milky Way-like stellar haloes: implications for disrupted dwarf galaxy searches

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dc.contributor.authorOrkney, Matthew D. A., Laporte, Chervin F. P., Grand, Robert J. J., Gomez, Facundo A., van de Voort, Freeke, Fattahi, Azadeh, Marinacci, Federico, Pakmor, Ruediger, Fragkoudi, Francesca, Springel, Volker
dc.date.accessioned2024-11-27T21:50:37Z
dc.date.available2024-11-27T21:50:37Z
dc.date.issued2023/08/09
dc.description.abstractWe 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 x10(8) < M-*/M-circle dot < 4 x10(9)) and include both rotation and pressure-supported galaxies (0.10 < D/T < 0.77). In a minority of cases, the GSE-like debris is comprised of stars from more than one merger progenitor. However, there is a close similarity in their chemodynamical properties and the triaxial shapes of their debris, and so it is not always possible to distinguish them. The merger progenitors host a variety of luminous satellites (0 and 8 with M-* > 106 M-circle dot), 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.
dc.identifier.doihttp://dx.doi.org/10.1093/mnras/stad2361
dc.identifier.issn0035-8711
dc.identifier.urihttps://publicacionesabiertas.userena.cl/handle/123456789/106
dc.languageEnglish
dc.publisherOXFORD UNIV PRESS
dc.subjectCOLD DARK-MATTER, METAL-POOR STARS, GALACTIC HALO, SOLAR NEIGHBORHOOD, DISSIPATIONLESS COLLAPSE, COSMOLOGICAL SIMULATIONS, GAIA-SAUSAGE/ENCELADUS, FORMATION HISTORIES, GLOBULAR-CLUSTERS, HERCULES-AQUILA
dc.titleExploring the diversity and similarity of radially anisotropic Milky Way-like stellar haloes: implications for disrupted dwarf galaxy searches
dc.typeArticle

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