High-resolution synthetic UV-submm images for simulated Milky Way-type
  galaxies from the Auriga project
  We present redshift-zero synthetic observational data considering dust
attenuation and dust emission for the thirty galaxies of the Auriga project,
calculated with the SKIRT radiative transfer code. The post-processing
procedure includes components for star-forming regions, stellar sources, and
diffuse dust taking into account stochastic heating of dust grains. This allows
us to obtain realistic high-resolution broadband images and fluxes from
ultraviolet to sub-millimeter wavelengths. For the diffuse dust component, we
consider two mechanisms for assigning dust to gas cells in the simulation. In
one case, only the densest or the coldest gas cells are allowed to have dust,
while in the other case this condition is relaxed to allow a larger number of
dust-containing cells. The latter approach yields galaxies with a larger radial
dust extent and an enhanced dust presence in the inter-spiral regions. At a
global scale, we compare Auriga galaxies with observations by deriving dust
scaling relations using SED fitting. At a resolved scale, we make a
multi-wavelength morphological comparison with nine well-resolved spiral
galaxies from the DustPedia observational database. We find that for both dust
assignment methods, although the Auriga galaxies show a good overall agreement
with observational dust properties, they exhibit a slightly higher specific
dust mass. The multi-wavelength morphological analysis reveals a good agreement
between the Auriga and the observed galaxies in the optical wavelengths. In the
mid and far-infrared wavelengths, Auriga galaxies appear smaller and more
centrally concentrated in comparison to their observed counterparts. We
publicly release the multi-observer images and fluxes in 50 commonly used
broadband filters.
