First results from the IllustrisTNG simulations: matter and galaxy clustering
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- 22 December 2017
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 475 (1), 676-698
- https://doi.org/10.1093/mnras/stx3304
Abstract
Hydrodynamical simulations of galaxy formation have now reached sufficient volume to make precision predictions for clustering on cosmologically relevant scales. Here, we use our new IllustrisTNG simulations to study the non-linear correlation functions and power spectra of baryons, dark matter, galaxies, and haloes over an exceptionally large range of scales. We find that baryonic effects increase the clustering of dark matter on small scales and damp the total matter power spectrum on scales up to k ∼ 10 h Mpc−1 by 20 per cent. The non-linear two-point correlation function of the stellar mass is close to a power-law over a wide range of scales and approximately invariant in time from very high redshift to the present. The two-point correlation function of the simulated galaxies agrees well with Sloan Digital Sky Survey at its mean redshift z ≃ 0.1, both as a function of stellar mass and when split according to galaxy colour, apart from a mild excess in the clustering of red galaxies in the stellar mass range of109–1010 h−2 M⊙. Given this agreement, the TNG simulations can make valuable theoretical predictions for the clustering bias of different galaxy samples. We find that the clustering length of the galaxy autocorrelation function depends strongly on stellar mass and redshift. Its power-law slope γ is nearly invariant with stellar mass, but declines from γ ∼ 1.8 at redshift z = 0 to γ ∼ 1.6 at redshift z ∼ 1, beyond which the slope steepens again. We detect significant scale dependences in the bias of different observational tracers of large-scale structure, extending well into the range of the baryonic acoustic oscillations and causing nominal (yet fortunately correctable) shifts of the acoustic peaks of around ∼ 5 per cent.Keywords
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Funding Information
- European Research Council (EXAGAL-308037)
- NASA (NNX17AG29G)
- NSF (AST-1402480)
This publication has 110 references indexed in Scilit:
- THE DEEP2 GALAXY REDSHIFT SURVEY: CLUSTERING DEPENDENCE ON GALAXY STELLAR MASS AND STAR FORMATION RATE ATz∼ 1The Astrophysical Journal, 2013
- Galacticus: A semi-analytic model of galaxy formationNew Astronomy, 2012
- The zCOSMOS survey. The dependence of clustering on luminosity and stellar mass at $z=0.2$–1Astronomy & Astrophysics, 2009
- The VIMOS-VLT Deep Survey (VVDS)Astronomy & Astrophysics, 2007
- Observational Evidence for an Age Dependence of Halo BiasThe Astrophysical Journal, 2006
- Detection of the Baryon Acoustic Peak in the Large‐Scale Correlation Function of SDSS Luminous Red GalaxiesThe Astrophysical Journal, 2005
- Galaxy Clustering and Galaxy Bias in a ΛCDM UniverseThe Astrophysical Journal, 2004
- The Clustering of High‐Redshift Galaxies in the Cold Dark Matter ScenarioThe Astrophysical Journal, 1999
- Redshift Evolution of the Nonlinear Two‐Point Correlation FunctionThe Astrophysical Journal, 1999
- Clusters, filaments, and voids in a universe dominated by cold dark matterThe Astrophysical Journal, 1987