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Reproducing the Universe: a comparison between the EAGLE simulations and the nearby DustPedia galaxy sample

Journal
Date Issued
2020
Author(s)
Trčka, Ana
•
Baes, Maarten
•
Camps, Peter
•
Meidt, Sharon E.
•
Trayford, James
•
•
•
•
De Looze, Ilse
•
De Vis, Pieter
•
Dobbels, Wouter
•
Fritz, Jacopo
•
Galametz, Maud
•
Galliano, Frédéric
•
Katsianis, Antonios
•
Madden, Suzanne C.
•
Mosenkov, Aleksandr V.
•
Nersesian, Angelos
•
Viaene, Sébastien
•
Xilouris, Emmanuel M.
DOI
Abstract
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.
Volume
494
Issue
2
Start page
2823
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2020MNRAS.494.2823T
Rights
open.access
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