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A large fraction of early-type galaxies (ETGs) host prominent dust features,and central dust rings are arguably the most interesting among them. We presenthere `Lord Of The Rings' (LOTR), a new methodology which allows to integratethe extinction by dust rings in a 2D fitting modelling of the surfacebrightness distribution. Our pipeline acts in two steps, first using thesurface fitting software GALFIT to determine the unabsorbed stellar emission,and then adopting the radiative transfer code SKIRT to apply dust extinction.We apply our technique to NGC 4552 and NGC 4494, two nearby ETGs. We show thatthe extinction by a dust ring can mimic, in a surface brightness profile, acentral point source (e.g. an unresolved nuclear stellar cluster or an activegalactic nucleus; AGN) superimposed to a `core' (i.e. a central flattening ofthe stellar light commonly observed in massive ETGs). We discuss how properlyaccounting for dust features is of paramount importance to derive correctfluxes especially for low luminosity AGNs (LLAGNs). We suggest that thegeometries of dust features are strictly connected with how relaxed is thegravitational potential, i.e. with the evolutionary stage of the host galaxy.Additionally, we find hints that the dust mass contained in the ring relates tothe AGN activity.

Modelling dust rings in early-type galaxies through a sequence of radiative transfer simulations and 2D image fitting