Tracing Galaxy Formation with Stellar Halos. II. Relating Substructure in Phase and Abundance Space to Accretion Histories
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This paper explores the mapping between the observable properties of a stellar halo in phase and abundance space and the parent galaxy's accretion history in terms of the characteristic epoch of accretion and mass and orbits of progenitor objects. The study utilizes a suite of 11 stellar halo models constructed within the context of a standard ΛCDM cosmology. The results demonstrate that coordinate-space studies are sensitive to the recent (0-8 Gyr ago) merger histories of galaxies (this timescale corresponds to the last few percent to tens of percent of mass accretion for a Milky Way-type galaxy). Specifically, the frequency, sky coverage , and fraction of stars in substructures in the stellar halo as a function of surface brightness are indicators of the importance of recent merging and of the luminosity function of infalling dwarfs. The morphology of features serves as a guide to the orbital distribution of those dwarfs. Constraints on the earlier merger history (>8 Gyr ago) can be gleaned from the abundance patterns in halo stars: within our models, dramatic differences in the dominant epoch of accretion or luminosity function of progenitor objects leave clear signatures in the [α/Fe] and [Fe/H] distributions of the stellar halo; halos dominated by very early accretion have higher average [α/Fe], while those dominated by high-luminosity satellites have higher [Fe/H]. This insight can be applied to reconstruct much about the merger histories of nearby galaxies from current and future data sets.
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Using tidal features to study galaxy evolution can provide important observational confirmation on the contribution of low-mass galaxies to the merging process.
“Hence, using tidal features to study galaxy evolution can provide important observational confirmation on the contribution of low-mass galaxies to the merging process (e.g. Johnston et al. 2008).”
From Detecting galaxy tidal features using self-supervised representation learning (2024) · cites this paper as Johnston et al. 2008
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Detecting galaxy tidal features using self-supervised representation learning
Desmons, A., Brough, S., & Lanusse, F. (2024) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stae1402 · Cited by 15 · see citing works
- Authors
- Johnston, K. V., Bullock, J. S., Sharma, S., Font, A., Robertson, B. E., & Leitner, S. N.
- Affiliations
- Columbia University (US)
- University of California, Irvine (US)
- Durham University (GB)
- University of Chicago (US)
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2008-12-20
- Volume
- 689
- Issue
- 2
- Pages
- 936-957
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2072040939
- Cited by
- 416
- References
- 64
- Citations by year
- 2026: 12 · 2025: 14 · 2024: 32 · 2023: 28 · 2022: 24 · 2021: 18 · 2020: 27 · 2019: 26 · 2018: 28 · 2017: 23 · 2016: 38 · 2015: 20 · 2014: 19 · 2013: 14 · 2012: 20
- FWCI
- 14.00
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Liverpool John Moores University (submittedVersion)
- arXiv (Cornell University)
- 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 › Astrophysical Phenomena and Observations
- Keywords
- stellar halo, galaxy formation, accretion history, merger history, alpha-enhanced stars, Milky Way
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