NGC 3115 MUSE images

We emphasise an observed correlation between the radial stellar velocity, V, and the Gauss-Hermite moment, h_3_, which creates a butterfly shape in the central 15" of the h_3_ map. We further detect the previously reported weak spiral- and ring-like structures, and find evidence that these features can be associated with regions of younger mean stellar ages. We provide tentative evidence for the presence of a bar, although the V-h_3_ correlation can be reproduced by a simple axisymmetric dynamical model.

Finally, we present a reconstruction of the two-dimensional star formation history of NGC 3115 and find that most of its current stellar mass was formed at early epochs (>12Gyr ago), while star formation continued in the outer (kpc-scale) stellar disc until recently. Since z~2 and within ~4R_e_, we suggest that NGC 3115 has been mainly shaped by secular processes.