The TNG50-SKIRT Atlas: Spatially resolved synthetic galaxies from the ultraviolet to the sub-millimetre (DR2)

We present the second data release (DR2) of the TNG50-SKIRT Atlas (TSA), a library of synthetic, spatially resolved galaxy observables. The atlas was constructed by post-processing a stellar-mass-complete (10 9.8 M ⊙ < M * < 10 12 M ⊙ ) sample of 1154 z = 0 galaxies from the TNG50 cosmological hydrodynamical simulation with the Monte Carlo radiative transfer code SKIRT . Compared to the first release, TSA DR2 extends the wavelength coverage from the ultraviolet to the sub-millimetre, including dust emission, and it incorporates updated stellar population models together with an improved treatment of dust-enshrouded star-forming regions. The atlas provides spatially resolved spectral energy distributions, broadband images, and physical property maps for multiple viewing orientations, as well as a catalogue of integrated properties enabling direct comparison with unresolved observations. We validated the data products through extensive quality control, including an assessment of Monte Carlo noise, and we demonstrated their internal consistency using diagnostic relations between luminosities and star formation rates. TSA DR2 provides a versatile resource for studies of dust attenuation and emission, star formation tracers, galaxy morphology, and multi-wavelength scaling relations across spatial scales. The atlas and associated data products are publicly released and are intended to support a wide range of observationally oriented studies of galaxy evolution.