Optical colours and spectral indices of <i>z</i>=0.1 EAGLE galaxies with the 3D dust radiative transfer code SKIRT

Simple item page
dc.contributor.authorTrayford, James W.
dc.contributor.authorCamps, Peter
dc.contributor.authorTheuns, Tom
dc.contributor.authorBaes, Maarten
dc.contributor.authorBower, Richard G.
dc.contributor.authorCrain, Robert A.
dc.contributor.authorGunawardhana, Madusha L. P.
dc.contributor.authorSchaller, Matthieu
dc.contributor.authorSchaye, Joop
dc.contributor.authorFrenk, Carlos S.
dc.date.accessioned2025-01-23T21:25:52Z
dc.date.available2025-01-23T21:25:52Z
dc.date.issued2017
dc.description.abstractWe present mock optical images, broad-band and H alpha fluxes, and D4000 spectral indices for 30 145 galaxies from the EAGLE hydrodynamical simulation at redshift z = 0.1, modelling dust with the SKIRT Monte Carlo radiative transfer code. The modelling includes a subgrid prescription for dusty star-forming regions, with both the subgrid obscuration of these regions and the fraction of metals in diffuse interstellar dust calibrated against far-infrared fluxes of local galaxies. The predicted optical colours as a function of stellar mass agree well with observation, with the SKIRT model showing marked improvement over a simple dust-screen model. The orientation dependence of attenuation is weaker than observed because EAGLE galaxies are generally puffier than real galaxies, due to the pressure floor imposed on the interstellar medium (ISM). The mock Ha luminosity function agrees reasonably well with the data, and we quantify the extent to which dust obscuration affects observed H alpha fluxes. The distribution of D4000 break values is bimodal, as observed. In the simulation, 20 per cent of galaxies deemed 'passive' for the SKIRT model, i.e. exhibiting D4000 > 1.8, are classified 'active' when ISM dust attenuation is not included. The fraction of galaxies with stellar mass greater than 10(10) M-circle dot that are deemed passive is slightly smaller than observed, which is due to low levels of residual star formation in these simulated galaxies. Colour images, fluxes and spectra of EAGLE galaxies are to be made available through the public EAGLE data base.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stx1051
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stx1051
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101339
dc.identifier.wosidWOS:000406842600048
dc.issue.numero1
dc.language.isoen
dc.pagina.final799
dc.pagina.inicio771
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectdust, extinction
dc.subjectgalaxies: star formation
dc.titleOptical colours and spectral indices of <i>z</i>=0.1 EAGLE galaxies with the 3D dust radiative transfer code SKIRT
dc.typeartículo
dc.volumen470
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
Files
Collections
Artículos de revistas