Thursday 14/03/2019 @ 11:30, Sala IV piano Battiferro
Michele Cignoni (Università di Pisa), "Star formation histories of the LEGUS dwarf galaxies"
I will present the detailed recent star formation history (SFH) of dwarf galaxies between 3 and 12 Mpc from the Legacy ExtraGalactic UV Survey (LEGUS). This sample includes a variety of morphologies and densities, such as the diffuse and low density Holmberg II, the Magellanic irregular NGC4449 and the Blue Compact NGC1705. The SFHs are derived by comparing deep UV color-magnitude diagrams (CMDs) with state-of-the-art synthetic CMDs. In order to assess the uncertainties related to stellar evolution modelling, two independent sets of stellar isochrones are used: PARSEC-COLIBRI and MIST. The SFHs derived with the two different sets of stellar models are consistent with each other, except for some quantitative details, attributable to their input assumptions. I will discuss how these SFHs compare with previous optical CMD studies and integrated SFR measurements (H? and UV). Critical insights into the star cluster disruption rate in dwarf galaxies will be provided.