Seminari di Sezione

Galactic Archeology: recovering the history of star formation in nearby galaxies with deep color-magnitude diagrams

by Michele Cignoni (PI)

Europe/Rome
Room 131 (Sala Galilei)

Room 131

Sala Galilei

Via ZOOM https://infn-it.zoom.us/j/84261721878?pwd=MDZNaGdBUlcvUUJXa2phSHZVZk5sdz09 ID riunione: 842 6172 1878 Passcode: 611379
Description
Abstract:
The premise of "Galactic Archeology" is that the study of nearby galaxies on a star-by-star basis has implications that extend far beyond the local Universe. In this talk I will discuss the technique of deriving the star formation history (SFH) of a galaxy through the comparison of state-of-the-art synthetic color-magnitude diagrams (CMD) with the observational counterpart. As a first example I will present the SFH of 23 star forming dwarf galaxies between 3 and 12 Mpc using Hubble Space Telescope data from the Legacy ExtraGalactic UV Survey (LEGUS). Approximately half of our galaxies show spatial progression of star formation in the last 60 Myr, and/or very recent diffuse and off-center activity compared to old stars. As a second example I will focus on the SFH of Local Group galaxies, in particular the Small Magellanic Cloud and the “fossil fragment” Liller 1 in the Galactic Bulge.