Galaxy formation in the PLANCK cosmology - III. The high-redshift universe

Abstract

We present high-redshift predictions of the star-formation-rate distribution function (SFR DF), UV luminosity function (UV LF), galactic stellar mass function (GSMF), and specific star-formation rates (sSFRs) of galaxies from the latest version of the Munich semi-analytic model L-Galaxies. We find a good fit to both the shape and normalisation of the SFR DF at $z=4-7$, apart from a slight under-prediction at the low SFR end at $z=4$. Likewise, we find a good fit to the faint number counts for the observed UV LF; at brighter magnitudes our predictions lie below the observations, increasingly so at higher redshifts. At all redshifts and magnitudes, the raw (unattenuated) number counts for the UV LF lie above the observations. Because of the good agreement with the SFR we interpret our under-prediction as an over-estimate of the amount of dust in the model for the brightest galaxies, especially at high-redshift. While the shape of our GSMF matches that of the observations, we lie between (conflicting) observations at $z=4-5$, and under-predict at $z=6-7$. The sSFRs of our model galaxies show the observed trend of increasing normalisation with redshift, but do not reproduce the observed mass dependence. Overall, we conclude that the latest version of L-Galaxies, which is tuned to match observations at $z\le 3$, does a fair job of reproducing the observed properties of galaxies at $z\ge 4$. More work needs to be done on understanding observational bias at high-redshift, and upon the dust model, before strong conclusions can be drawn on how to interpret remaining discrepancies between the model and observations.

Updated to reflect the published version in MNRAS (12 pages, 7 figures). Note that this was previously paper IV, but was renamed to III by the journal. Some references have been fixed, and the Bowler2014b observational errors in Figure 3 have been corrected to their proper values

References in corpus (10)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The hierarchical formation of the brightest cluster galaxies
• Properties of galaxies reproduced by a hydrodynamic simulation
• Introducing the Illustris Project: the evolution of galaxy populations across cosmic time
• A Dust-Obscured Massive Maximum-Starburst Galaxy at a Redshift of 6.34
• The mass evolution of the first galaxies: stellar mass functions and star formation rates at $4<z<7$ in the CANDELS GOODS-South field
• z~7-10 Galaxies in the HUDF and GOODS fields, and their UV Luminosity Functions
• The high redshift galaxy population in hierarchical galaxy formation models
• The UDF05 Follow-up of the HUDF: II. Constraints on Reionization from z-dropout Galaxies
• A Confirmation of the Strong Clustering of Distant Red Galaxies at 2 < z <3

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