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We apply the radiative transfer (RT) code SKIRT on a sample of ~14000low-redshift (z<= 0.1) galaxies extracted from the TNG50 simulation to enablean apples-to-apples comparison with observations. The RT procedure iscalibrated via comparison of a subsample of TNG50 galaxies with the DustPediaobservational sample: we compare several luminosity and colour scalingrelations and spectral energy distributions in different specific SFR bins. Weconsistently derive galaxy luminosity functions for the TNG50 simulation in 14broadband filters from UV to submillimetre wavelengths and investigate theeffects of the aperture, orientation, radiative transfer recipe, and numericalresolution. We find that, while our TNG50+RT fiducial model agrees well withthe observed luminosity functions at the knee (+/- 0.04 dex typical agreement),the TNG50+RT luminosity functions evaluated within 5R_1/2 are generally higherthan observed at both the faint and bright ends, by 0.004 (total IR)-0.27(UKIDSS H) dex and 0.12 (SPIRE250)-0.8 (GALEX FUV) dex, respectively. A changein the aperture does affect the bright end of the luminosity function, easilyby up to 1 dex depending on the choice. However, we also find that the galaxyluminosity functions of a worse-resolution run of TNG50 (TNG50-2, with 8 timesworse mass resolution than TNG50, similar to TNG100) are in better quantitativeagreement with observational constraints. Finally, we publicly release thephotometry for the TNG50 sample in 53 broadbands from FUV to submillimetre, inthree orientations and four apertures, as well as galaxy spectral energydistributions.

UV to submillimetre luminosity functions of TNG50 galaxies