Searching for satellite galaxies of low-mass hosts

Daniella Roberts (OSU)
Friday, December 10, 2021 - 2:00pm to 3:00pm

The observation of the satellite galaxy population of the Milky Way (MW), and other MW-mass galaxies in the local universe, has been well studied and successful at constraining dark-matter and hierarchical structure formation. However, we worry that solutions are overtuned, with environmental effects being not well understood. Therefore, by shifting to lower-mass hosts, which are far less studied even though they are more abundant than high-mass hosts, we can test environmental quenching mechanisms and test hierarchical assembly on yet another scale.

In this talk I will present the first study of satellite systems of low-mass hosts across half the age of the universe in the COSMOS survey. This allows us to understand hierarchical structure formation as a function of time and uncover the bright end of the satellite luminosity function (SLF), while further constraining the stellar mass-halo mass relation. I will follow up with our ongoing study of visible low-surface-brightness satellite galaxies of low-mass hosts at distances ~10 Mpc in the DES and IMAGINE survey respectively. This study allows us to further understand galaxy formation physics by doing an in-depth study on each satellite galaxy and its interaction with the host, while also providing additional insights on the faint end of the SLF.

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