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) |