The SAGA Project: Satellite Galaxy Populations Around Milky Way-like Galaxies

Prof. Marla Geha (Yale)
Tuesday, December 11, 2018 - 4:00pm

The properties of the Milky Way's satellite galaxies provide critical clues to how galaxies form. However, the number of Milky Way satellites and their properties do not fully agree with well-established cosmological models. The SAGA (Satellites Around Galactic Analogs) survey is a long-term program to determine complete satellite luminosity functions around 100 Milky Way analogs down to Mr = -12. I will present recent results from the SAGA survey. Surprisingly, the majority (26/27) of our satellites are star-forming, as compared to 2 of 5 star-forming Milky Way satellites in the same luminosity range. I will discuss how SAGA results potentially change the physical interpretation of measurements based only on the Milky Way's satellites.

Talk Type: