Program: GN-2016A-Q-8

We propose high-resolution spectroscopic observation on the background QSO with intervening MgII absorption line from the foreground cluster galaxies using GRACES on Gemini-North. MgII absorption lines, probing metal-enriched cool gas halos provide valuable information on the spatial distribution and physical condition of the circumgalactic medium of galaxies that are crucial to understanding of baryon cycle involved in galaxy evolution. Study of complex kinematics and physical status of the circumgalactic medium is limited with the moderate resolution SDSS spectrum, therefore high resolution spectroscopy that can resolve structures as precise as \Delta v~10km/s is required. Variation of the MgII absorption kinematics as a function of environment where the host galaxy lies in is poorly constrained. Our unique target, background QSO associated with two foreground absorbers which are possibly members of galaxy clusters, would provide a starting point to understand how star-forming galaxies in dense environment maintain the cool gas halo around themselves and what dynamical processes are ongoing in their circumgalactic region.