Cited by 153Stellar, planetary, and galactic studiesGalaxies: Formation, Evolution, PhenomenaAstrophysics and Star Formation Studies

THE DOMINANT EPOCH OF STAR FORMATION IN THE MILKY WAY FORMED THE THICK DISK

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Snaith, Owain N., Haywood, Misha, Di Matteo, Paola, Lehnert, Matthew D., Combes, Françoise, Katz, David, Gómez, Ana·2014·The Astrophysical Journal

Abstract

We report the first robust measurement of the Milky Way star formation history using the imprint left on chemical abundances of long-lived stars. The formation of the Galactic thick disk occurs during an intense star formation phase between 9.0 ( z ∼ 1.5) and 12.5 Gyr ( z ∼ 4.5) ago and is followed by a dip (at z ∼ 1.1) lasting about 1 Gyr. Our results imply that the thick disk is as massive as the Milky Way's thin disk, suggesting a fundamental role of this component in the genesis of our Galaxy, something that had been largely unrecognized. This new picture implies that huge quantities of gas necessary to feed the building of the thick disk must have been present at these epochs, in contradiction with the long-term infall assumed by chemical evolution models in the last two decades. These results allow us to fit the Milky Way within the emerging features of the evolution of disk galaxies in the early universe.

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Crossref · 10.1088/2041-8205/781/2/l31

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  • The Milky Way never experienced a major merger since reaching a mass of M? ~ 10^9 Msun, which it had already attained at z = 4.

    “Accordingly, the Milky Way never experienced a major merger since reaching a mass of M ? 10 9 M , which it had already attained at z = 4 (Snaith et al. 2014; Kruijssen et al. 2019b).”

    From Kraken reveals itself – the merger history of the Milky Way reconstructed with the E-MOSAICS simulations (2020) · cites this paper as Snaith et al. 2014

    The Results and Section 5.2 describe early star formation and gas accretion, but do not say whether the Milky Way experienced a major merger after reaching a particular mass. The Figure 2 caption describes cumulative stellar mass by redshift without stating a mass of approximately 10^9 solar masses at z = 4. Searches for the merger history and the claimed mass threshold found no passage establishing the claim. (LLM, conf=0.76)

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Research works printed but not linked: 2

  1. Anders, F., Chiappini, C., Santiago, B. X., Rocha-Pinto, H. J., Girardi, L., et al. 2013, arXiv:1311.4549 · arXiv
  2. Bernkopf, J., Fidler, A., & Fuhrmann, K. 2001, in ASP Conf. Ser. 245, Astrophysical Ages and Times Scales, ed. T. von Hippel, C. Simpson, & N. Manset (San Francisco, CA: ASP), 207

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Authors
Snaith, O. N., Haywood, M., Di Matteo, P., Lehnert, M. D., Combes, F., Katz, D., & Gómez, A.
Affiliations
Centre National de la Recherche Scientifique (FR)
Corresponding author
Snaith, Owain N.
Venue
The Astrophysical Journal
Published
2014-01-10
Volume
781
Issue
2
Pages
L31
ISSN
  • 2041-8205 (ISSN-L)
  • 2041-8213
OpenAlex
W2079368516
Cited by
153
References
42
Citations by year
2026: 1 · 2025: 11 · 2024: 9 · 2023: 11 · 2022: 5 · 2021: 15 · 2020: 7 · 2019: 17 · 2018: 13 · 2017: 18 · 2016: 21 · 2015: 13 · 2014: 12
FWCI
11.49
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal Letters (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • HAL (submittedVersion)
  • arXiv (Cornell University)
Funders
Agence Nationale de la Recherche (ANR-10-BLAN-0508, ANR-10)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Keywords
Milky Way thick disk, star formation history, chemical abundances, disk galaxy evolution, gas infall, disk mass, chemical evolution models

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