Monday

Understanding the build-up of stellar mass is one of the primary goals of extra-galactic astronomy. Various theoretical and observational studies find that star formation activity for galaxies in high density region peaks between redshift z=3-5, whereas for galaxies in the low density environment it peaks between redshift z=1-2. I will present the first measurements of star formation histories of galaxies in a proto-cluster at z~2 using SED fitting code Prospector. I will demonstrate that environment affects the stellar mass build-up in high stellar mass galaxies and show early signs of star formation suppression. I will also present a comparison of star formation histories from Prospector to star formation histories from IllustrisTNG cosmological simulations and using IllustrisTNG, show how the environment of the galaxy itself pushes the massive galaxies towards their end (quenching).