Department of Astronomy Center for Radiophysics & Space Research

Understanding the Effect of Environment on Chemical Evolution of Star-forming Galaxies

22Friday, Sep. 22
Anshu Gupta (Australian National University)
Space Sciences Building 622


The debate between nature versus nurture is still not over regarding the chemical evolution of cluster galaxies. In this talk, I will present our observations of a cluster-scale gradient in the metallicity of star-forming galaxies as a complementary method to discern the impact of environment on chemical evolution. Our observations for MACS J1115+0129 show that cluster galaxies near the cluster center are more metal-rich compared to galaxies in the cluster outskirts. Using a semi-analytic model of ram pressure stripping, we prove that removal of low-metallicity gas is not sufficient to reproduce the metallicity gradient. I will also present our recent results from IllustrisTNG simulations predicting the pre-processing of metals in groups before they merge into a galaxy cluster.