First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies
Top Cited Papers
- 1 December 2017
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 475 (1), 648-675
- https://doi.org/10.1093/mnras/stx3112
Abstract
The IllustrisTNG project is a new suite of cosmological magneto-hydrodynamical simulations of galaxy formation performed with the AREPO code and updated models for feedback physics. Here we introduce the first two simulations of the series, TNG100 and TNG300, and quantify the stellar mass content of about 4000 massive galaxy groups and clusters (1013 ≤ M200c/M⊙ ≤ 1015) at recent times (z ≤ 1). The richest clusters have half of their total stellar mass bound to satellite galaxies, with the other half being associated with the central galaxy and the diffuse intra-cluster light. Haloes more massive than about 5 × 1014M⊙ have more diffuse stellar mass outside 100 kpc than within 100 kpc, with power-law slopes of the radial mass density distribution as shallow as the dark matter’s ($$-3.5 {\lesssim} \alpha _{\rm 3D} {\lesssim} -3$$). Total halo mass is a very good predictor of stellar mass, and vice versa: at z = 0, the 3D stellar mass measured within 30 kpc scales as ∝(M500c)0.49 with a ∼0.12 dex scatter. This is possibly too steep in comparison to the available observational constraints, even though the abundance of TNG less massive galaxies ($${\lesssim} 10^{11}{\rm M}_{\odot }$$ in stars) is in good agreement with the measured galaxy stellar mass functions at recent epochs. The 3D sizes of massive galaxies fall too on a tight (∼0.16 dex scatter) power-law relation with halo mass, with $$r^{\rm stars}_{\rm 0.5} \propto (M_{\rm 200c})^{0.53}$$. Even more fundamentally, halo mass alone is a good predictor for the whole stellar mass profiles beyond the inner few kpc, and we show how on average these can be precisely recovered given a single mass measurement of the galaxy or its halo.
Keywords
Funding Information
- ERC (EXAGAL-308037)
- NASA (HST-HF-51384.001-A)
- Simons Foundation (HST-HF2-51384.001-A)
- NSF (AST-1402480)
This publication has 111 references indexed in Scilit:
- THE SIZE-VIRIAL RADIUS RELATION OF GALAXIESThe Astrophysical Journal Letters, 2013
- A low-scatter survey-based mass proxy for clusters of galaxiesAstronomy & Astrophysics, 2012
- Cosmological Simulations of Galaxy ClustersAdvanced Science Letters, 2011
- STELLAR AND TOTAL BARYON MASS FRACTIONS IN GROUPS AND CLUSTERS SINCE REDSHIFT 1*The Astrophysical Journal, 2009
- MOIRCS DEEP SURVEY. IV. EVOLUTION OF GALAXY STELLAR MASS FUNCTION BACK TOz∼ 3The Astrophysical Journal, 2009
- The Hierarchical Build‐Up of Massive Galaxies and the Intracluster Light sincez= 1The Astrophysical Journal, 2007
- The hierarchical formation of the brightest cluster galaxiesMonthly Notices of the Royal Astronomical Society, 2007
- Diffuse Light in the Virgo ClusterThe Astrophysical Journal, 2005
- Galaxy Clusters in Hubble Volume Simulations: Cosmological Constraints from Sky Survey PopulationsThe Astrophysical Journal, 2002
- Galaxy harassment and the evolution of clusters of galaxiesNature, 1996