Galaxy luminosity functions from far-UV to submillimetre at z=0 in the COLIBRE simulations

@misc{lu2026galaxy,
  title = {{Galaxy luminosity functions from far-UV to submillimetre at $z=0$ in the COLIBRE simulations}},
  author = {Shengdong Lu and Carlos S. Frenk and Cedric G. Lacey and Andrea Gebek and Joop Schaye and Shaun Cole and Sownak Bose and Nick Andreadis and Maarten Baes and Alejandro Benítez-Llambay and Evgenii Chaikin and Robert A. Crain and Anna Durrant and Filip Huško and Sylvia Ploeckinger and Alexander J. Richings and Matthieu Schaller and James W. Trayford},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2605.02022},
  eprint = {2605.02022},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.02022},
}

TY  - UNPB
TI  - Galaxy luminosity functions from far-UV to submillimetre at z=0 in the COLIBRE simulations
AU  - Shengdong Lu
AU  - Carlos S. Frenk
AU  - Cedric G. Lacey
AU  - Andrea Gebek
AU  - Joop Schaye
AU  - Shaun Cole
AU  - Sownak Bose
AU  - Nick Andreadis
AU  - Maarten Baes
AU  - Alejandro Benítez-Llambay
AU  - Evgenii Chaikin
AU  - Robert A. Crain
AU  - Anna Durrant
AU  - Filip Huško
AU  - Sylvia Ploeckinger
AU  - Alexander J. Richings
AU  - Matthieu Schaller
AU  - James W. Trayford
PY  - 2026
DA  - 2026/09/30
PB  - arXiv
DO  - 10.48550/arxiv.2605.02022
UR  - https://arxiv.org/abs/2605.02022
AB  - We present predictions from the COLIBRE cosmological hydrodynamical simulations of galaxy formation for the present-day galaxy luminosity functions (LFs) at wavelengths ranging from the far-ultraviolet (FUV) to the submillimetre. The simulations are post-processed with the radiative transfer code SKIRT, accounting for dust attenuation and emission using the distribution and properties of dust grains predicted directly by COLIBRE. Results from simulations varying in mass resolution by a factor of ∼ 10^2 (∼ 10^5 − 10^7 M_⊙) show very good convergence over most luminosity ranges. The COLIBRE-SKIRT LFs match the data remarkably well from the FUV to 3.4 μm and also in the far-infrared and submillimetre wavelength range (70−850 μm). In the mid-infrared (MIR; 8−24 μm), COLIBRE-SKIRT matches the data well at low luminosities but significantly underpredicts the luminosities of MIR-bright galaxies, with the discrepancy increasing towards longer wavelengths. The total infrared LF, obtained by integrating the spectral energy distributions over 8−1000 μm, also matches observations well at the faint end but underpredicts the number of very bright galaxies. The unprecedented agreement at all other wavelengths indicates that COLIBRE, coupled with this calibration-free SKIRT post-processing framework, successfully predicts the properties of stellar populations at the present day and the amount and distribution of interstellar dust.
ER  -