AI Insight
Researchers used COLIBRE cosmological simulations combined with SKIRT radiative transfer modeling to predict galaxy brightness distributions across wavelengths from far-ultraviolet to submillimeter at the present day. The simulations showed excellent agreement with observational data across most wavelengths, particularly from far-UV to near-infrared and in far-infrared/submillimeter ranges, though they underpredicted the brightness of mid-infrared luminous galaxies. The results demonstrate that COLIBRE simulations successfully reproduce current stellar populations and interstellar dust properties without requiring calibration adjustments.
Why it matters
This validation of simulation accuracy provides a powerful tool for understanding galaxy formation and evolution processes that cannot be directly observed. The framework can help interpret observations from current and future telescopes, though the mid-infrared discrepancies suggest some physical processes in very bright galaxies may need refinement in the models.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Abstract: 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 $sim 10^2$ ($sim 10^5 – 10^7,mathrm{M_{odot}}$) show very good convergence over most luminosity ranges. The COLIBRE-SKIRT LFs match the data remarkably well from the FUV to $3.4,mu rm m$ and also in the far-infrared and submillimetre wavelength range ($70-850,mu rm m$). In the mid-infrared (MIR; $8-24,mu rm m$), 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 $8-1000,mu rm m$, 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.
Source: Galaxy luminosity functions from far-UV to submillimetre at $z=0$ in the COLIBRE simulations