Cited by 149Galaxies: Formation, Evolution, PhenomenaStellar, planetary, and galactic studiesCosmology and Gravitation Theories

The fraction of dark matter within galaxies from the IllustrisTNG simulations

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Lovell, Mark R, Pillepich, Annalisa, Genel, Shy, Nelson, Dylan, Springel, Volker, Pakmor, Rüdiger, Marinacci, Federico, Weinberger, Rainer +4 more·2018·Monthly Notices of the Royal Astronomical Society

Abstract

We use the IllustrisTNG (TNG) cosmological simulations to provide theoretical expectations for the dark matter mass fractions (DMFs) and circular velocity profiles of galaxies. TNG predicts flat circular velocity curves for |$z$| = 0 Milky Way (MW)-like galaxies beyond a few kpc from the galaxy centre, in better agreement with observational constraints than its predecessor, Illustris. TNG also predicts an enhancement of the dark matter mass within the 3D stellar half-mass radius (⁠|$r_{\rm half}$|⁠; |$M_{\rm 200c} = 10^{10}-10^{13}\, \mathrm{M_{\odot }}$|⁠, |$z$| ≤ 2) compared to its dark matter only and Illustris counterparts. This enhancement leads TNG present-day galaxies to be dominated by dark matter within their inner regions, with |$f_{\rm DM}(\lt r_{\rm half})\gtrsim 0.5$| at all masses and with a minimum for MW-mass galaxies. The 1σ scatter is ≲10 per cent at all apertures, which is smaller than that inferred by some observational data sets, e.g. 40 per cent from the sluggs survey. TNG agrees with the majority of the observationally inferred values for elliptical galaxies once a consistent initial mass function is adopted (Chabrier) and the DMFs are measured within the same apertures. The DMFs measured within |$r_{\rm half}$| increase towards lower redshifts: this evolution is dominated by the increase in galaxy size with time. At |$z$| ∼ 2, the DMF in disc-like TNG galaxies decreases with increasing galaxy mass, with |$f_{\rm DM}(\lt r_{\rm half}) \sim 0.10\hbox{--}0.65$| for 1010 ≲ Mstars/M|$\odot$| ≲ 1012, and are two times higher than if TNG galaxies resided in Navarro–Frenk–White dark matter haloes unaffected by baryonic physics. It remains to be properly assessed whether recent observational estimates of the DMFs at |$z$| ∼ 2 rule out the contraction of the dark matter haloes predicted by the TNG model.

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  • These results are in good agreement with other hydrodynamics simulations (NIHAO, IllustrisTNG) which show that, on average, the DM halo is contracted and the amplitude of contraction varies among systems.

    “These results are in good agreement with other hydrodynamics simulations, such as NIHAO (Dutton et al. 2016) and IllustrisTNG (Lovell et al. 2018), which also show that, on average, the DM halo is contracted and the amplitude of the contraction varies among different systems.”

    From The milky way total mass profile as inferred from Gaia DR2 (2020) · cites this paper as Lovell et al. 2018

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Research works printed but not linked: 4

  1. Cappellari M. et al., 2013b, MNRAS, 432, 1862 · DOI
  2. Garrison-Kimmel S. et al., 2017, preprint (arXiv:1712.03966) · arXiv
  3. Kulier A., Padilla N., Schaye J., Crain R. A., Schaller M., Bower R. G., Theuns T., Paillas E., 2018, preprint (arXiv:1805.05349) · arXiv
  4. Torrey P. et al., 2017, preprint (arXiv:1711.05261) · arXiv

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Authors
Lovell, M. R., Pillepich, A., Genel, S., Nelson, D., Springel, V., Pakmor, R., Marinacci, F., Weinberger, R., Torrey, P., Vogelsberger, M., Alabi, A., & Hernquist, L.
Affiliations
  • University of Iceland (IS)
  • Max Planck Institute for Astronomy (DE)
  • Flatiron Institute (US)
  • Max Planck Institute for Astrophysics (DE)
  • Heidelberg University (DE)
  • Heidelberg Institute for Theoretical Studies (DE)
  • Massachusetts Institute of Technology (US)
  • University of Florida (US)
  • University of California Observatories (US)
  • Center for Astrophysics Harvard & Smithsonian (US)
Corresponding author
  • Lovell, Mark R
  • Vogelsberger, Mark
Venue
Monthly Notices of the Royal Astronomical Society
Published
2018-08-25
Volume
481
Issue
2
Pages
1950-1975
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W2787779748
Cited by
149
References
161
Citations by year
2026: 7 · 2025: 15 · 2024: 21 · 2023: 23 · 2022: 19 · 2021: 21 · 2020: 18 · 2019: 21 · 2018: 4
FWCI
8.61
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • Durham Research Online (Durham University) (publishedVersion, other-oa)
  • arXiv (Cornell University) (acceptedVersion)
  • Durham Research Online (Durham University) (acceptedVersion)
  • Durham Research Online (Durham University) (submittedVersion, cc-by)
  • Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (submittedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-sa)
  • Opin vísindi (Opin vísindi) (submittedVersion, other-oa)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • Flatiron Health
  • European Commission (609412)
  • Klaus Tschira Stiftung
  • Gauss Centre for Supercomputing
  • FP7 Ideas: European Research Council (308037)
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 › Cosmology and Gravitation Theories
Keywords
dark matter halos, circular velocity profiles, galaxy size evolution, Milky Way-like galaxies, elliptical galaxies, disk galaxies, baryonic feedback, cosmological hydrodynamical simulations, IllustrisTNG

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