Opin vísindi

The fraction of dark matter within galaxies from the IllustrisTNG simulations

Show simple item record

dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Lovell, Mark
dc.contributor.author Pillepich, Annalisa
dc.contributor.author Genel, Shy
dc.contributor.author Nelson, Dylan
dc.contributor.author Springel, Volker
dc.contributor.author Pakmor, Rüdiger
dc.contributor.author Marinacci, Federico
dc.contributor.author Weinberger, Rainer
dc.contributor.author Torrey, Paul
dc.contributor.author Vogelsberger, Mark
dc.contributor.author Alabi, Adebusola
dc.contributor.author Hernquist, Lars
dc.date.accessioned 2019-08-13T15:54:20Z
dc.date.available 2019-08-13T15:54:20Z
dc.date.issued 2018-08-25
dc.identifier.citation Mark R Lovell, Annalisa Pillepich, Shy Genel, Dylan Nelson, Volker Springel, Rüdiger Pakmor, Federico Marinacci, Rainer Weinberger, Paul Torrey, Mark Vogelsberger, Adebusola Alabi, Lars Hernquist, The fraction of dark matter within galaxies from the IllustrisTNG simulations, Monthly Notices of the Royal Astronomical Society, Volume 481, Issue 2, December 2018, Pages 1950–1975, https://doi.org/10.1093/mnras/sty2339
dc.identifier.issn 0035-8711
dc.identifier.issn 1365-2966 (eISSN)
dc.identifier.uri https://hdl.handle.net/20.500.11815/1213
dc.description Publisher's version (útgefin grein)
dc.description.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 (⁠rhalf⁠; M200c=1010−1013M⊙⁠, 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 fDM(<rhalf)≳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 rhalf 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 fDM(<rhalf)∼0.10--0.65 for 1010 ≲ Mstars/M⊙ ≲ 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.
dc.description.sponsorship MRL is supported by a COFUND/Durham Junior Research Fellowship under EU grant 609412. MRL acknowledges support by a Grant of Excellence from the Icelandic Research Fund (grant number 173929-051). VS, RP, and RW acknowledge support through the European Research Council under ERC-StG grant EXAGAL-308037, and would like to thank the Klaus Tschira Foundation. The Flatiron Institute is supported by the Simons Foundation.
dc.format.extent 1950-1975
dc.language.iso en
dc.publisher Oxford University Press (OUP)
dc.relation.ispartofseries Monthly Notices of the Royal Astronomical Society;481(2)
dc.rights info:eu-repo/semantics/openAccess
dc.subject Galaxy: kinematics and dynamics
dc.subject Galaxy: structure
dc.subject Cosmology: dark matter
dc.subject Vetrarbrautir
dc.subject Heimsfræði
dc.subject Stjarneðlisfræði
dc.title The fraction of dark matter within galaxies from the IllustrisTNG simulations
dc.type info:eu-repo/semantics/article
dc.description.version Peer Reviewed
dc.identifier.journal Monthly Notices of the Royal Astronomical Society
dc.identifier.doi 10.1093/mnras/sty2339
dc.relation.url http://academic.oup.com/mnras/article-pdf/481/2/1950/25728487/sty2339.pdf
dc.contributor.department Raunvísindastofnun (HÍ)
dc.contributor.department Science Institute (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)

Files in this item

This item appears in the following Collection(s)

Show simple item record