Περίληψη:
We compare the spectral energy distributions (SEDs) and inferred physical properties for simulated and observed galaxies at low redshift. We exploit UV-submillimetre mock fluxes of ∼7000 z = 0 galaxies from the EAGLE suite of cosmological simulations, derived using the radiative transfer code SKIRT. We compare these to ∼800 observed galaxies in the UV-submillimetre range, from the DustPedia sample of nearby galaxies. To derive global properties, we apply the SED fitting code CIGALE consistently to both data sets, using the same set of ∼80 million models. The results of this comparison reveal overall agreement between the simulations and observations, both in the SEDs and in the derived physical properties, with a number of discrepancies. The optical and far-infrared regimes, and the scaling relations based upon the global emission, diffuse dust, and stellar mass, show high levels of agreement. However, the mid-infrared fluxes of the EAGLE galaxies are overestimated while the far-UV domain is not attenuated enough, compared to the observations. We attribute these discrepancies to a combination of galaxy population differences between the samples and limitations in the subgrid treatment of star-forming regions in the EAGLE-SKIRT post-processing recipe. Our findings show the importance of detailed radiative transfer calculations and consistent comparison, and provide suggestions for improved numerical models. © 2020 The Author(s)
Συγγραφείς:
Trčka, A.
Baes, M.
Camps, P.
Meidt, S.E.
Trayford, J.
Bianchi, S.
Casasola, V.
Cassarà, L.P.
de Looze, I.
de Vis, P.
Dobbels, W.
Fritz, J.
Galametz, M.
Galliano, F.
Katsianis, A.
Madden, S.C.
Mosenkov, A.V.
Nersesian, A.
Viaene, S.
Xilouris, E.M.
