Infrared luminosity functions and dust mass functions in the EAGLE simulation

Maarten Baes*, Ana Trcka, Peter Camps, James Trayford, Antonios Katsianis, Lucia Marchetti, Tom Theuns, Mattia Vaccari, Bert Vandenbroucke

*Corresponding author for this work

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Abstract

We present infrared luminosity functions and dustmass functions for the EAGLE cosmological simulation, based on synthetic multiwavelength observations generated with the SKIRT radiative transfer code. In the local Universe, we reproduce the observed infrared luminosity and dust mass functions very well. Some minor discrepancies are encountered, mainly in the high luminosity regime, where the EAGLE-SKIRT luminosity functions mildly but systematically underestimate the observed ones. The agreement between the EAGLE-SKIRT infrared luminosity functions and the observed ones gradually worsens with increasing lookback time. Fittingmodified Schechter functions to the EAGLE-SKIRT luminosity and dust mass functions at different redshifts up to z = 1, we find that the evolution is compatible with pure luminosity/mass evolution. The evolution is relatively mild: within this redshift range, we find an evolution of L∗,250 ∝ (1 + z)1.68, L∗,TIR ∝ (1 + z)2.51 and M∗,dust ∝ (1 + z)0.83 for the characteristic luminosity/mass. For the luminosity/mass density we find ∈250 ∝ (1 + z)1.62, ∈TIR ∝ (1 + z)2.35, and pdust ∝ (1 + z)0.80, respectively. The mild evolution of the dust mass density is in relatively good agreement with observations, but the slow evolution of the infrared luminosity underestimates the observed luminosity evolution significantly.We argue that these differences can be attributed to increasing limitations in the radiative transfer treatment due to increasingly poorer resolution, combined with a slower than observed evolution of the SFR density in the EAGLE simulation and the lack of AGN emission in our EAGLE-SKIRT post-processing recipe.

Original languageEnglish
Pages (from-to)2912-2924
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume494
Issue number2
Early online date13 Apr 2020
DOIs
Publication statusPublished - 1 May 2020

Keywords

  • Cosmology: Observations
  • Galaxies: Evolution
  • Hydrodynamics
  • Radiative transfer
  • UKRI
  • STFC
  • ST/K00042X/1
  • ST/H008519/1
  • ST/K00087X/1
  • ST/K003267/1

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