2025/10/09 by Honor, Rachel, Cohen, Seth, Carleton, Timothy +27
#Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences
paper · doi:10.48550/arxiv.2510.08801
El Gordo (ACT-CL J0102-4915) is a massive galaxy cluster with two major mass components at redshift z=0.87. Using SED fitting results from JWST/NIRCam photometry, the fraction of quenched galaxies in this cluster was measured in two bins of stellar mass: 9<log(M_*/M\odot)<10 and 10≤log(M_*/M\odot)<12. While there is no correlation between the quenched fraction and angular separation from the cluster's overall center of mass, there is a correlation between the quenched fraction and angular separation from the center of the nearest of the two mass components for the less-massive galaxies. This suggests that environmental quenching processes are in place at z∼1, and that dwarf galaxies are more affected by those processes than massive galaxies.