Cited by 168Galaxies: Formation, Evolution, PhenomenaStellar, planetary, and galactic studiesAstrophysics and Star Formation Studies

Reverse engineering the Milky Way

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Forbes, Duncan A·2020·Monthly Notices of the Royal Astronomical Society

Abstract

The ages, metallicities, alpha-elements, and integrals of motion of globular clusters (GCs) accreted by the Milky Way from disrupted satellites remain largely unchanged over time. Here we have used these conserved properties in combination to assign 76 GCs to five progenitor satellite galaxies – one of which we dub the Koala dwarf galaxy. We fit a leaky-box chemical enrichment model to the age–metallicity distribution of GCs, deriving the effective yield and the formation epoch of each satellite. Based on scaling relations of GC counts we estimate the original halo mass, stellar mass, and mean metallicity of each satellite. The total stellar mass of the five accreted satellites contributed around 109 M⊙ in stars to the growth of the Milky Way but over 50 per cent of the Milky Way’s GC system. The five satellites formed at very early times and were likely accreted 8–11 Gyr ago, indicating rapid growth for the Milky Way in its early evolution. We suggest that at least three satellites were originally nucleated, with the remnant nucleus now a GC of the Milky Way. 11 GCs are also identified as having formed ex situ but could not be assigned to a single progenitor satellite.

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Crossref · 10.1093/mnras/staa245

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  • Forbes (2020)'s estimates of the stellar masses of the satellite progenitors represent upper limits.

    “For these reasons, the resulting estimates of the stellar masses represent (quite uncertain) upper limits, because they e ectively represent projected masses at z = 0 rather than at the time of accretion.”

    From Kraken reveals itself – the merger history of the Milky Way reconstructed with the E-MOSAICS simulations (2020) · cites this paper as Forbes (2020)

    Section 6 (p. 6) says Forbes used a near-zero-redshift relation to estimate stellar masses, but explicitly says its evolution is minor for low-mass galaxies and the predicted masses are not particularly sensitive to the merger epoch. The paper instead identifies the inferred metallicities—not the stellar masses—as upper limits at infall (section 6, p. 6; Conclusions, p. 8). (LLM, conf=0.85)

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Research works printed but not linked: 2

  1. Burkert, A., & Forbes, D. 2019, arXiv e-prints, arXiv:1901.00900 · arXiv
  2. Horta, D., Schiavon, R. P., Mackereth, J. T., et al. 2020, arXiv e-prints, arXiv:2001.03177 · arXiv

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Authors
Forbes, D. A.
Affiliations
Swinburne University of Technology (AU)
Corresponding author
Forbes, Duncan A
Venue
Monthly Notices of the Royal Astronomical Society
Published
2020-01-29
Volume
493
Issue
1
Pages
847-854
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W3004510381
Cited by
168
References
64
Citations by year
2026: 18 · 2025: 29 · 2024: 27 · 2023: 26 · 2022: 22 · 2021: 26 · 2020: 20
FWCI
10.47
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Swinburne figshare (Swinburne University of Technology) (submittedVersion)
  • arXiv (Cornell University)
Funders
ARC (DP160101608)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Keywords
globular clusters, Milky Way accretion history, age-metallicity relation, first integrals, alpha elements

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