Gravity Group Seminar, Cristobal Sifon (Princeton University) "Weak lensing masses of galaxies in galaxy clusters, from LRGs to UDGs"
We present a direct measurement of the masses of subhalos hosting galaxies in massive, low-redshift galaxy clusters using weak gravitational lensing. We constrain the average subhalo mass as a function of stellar mass to probe the total-to-stellar mass relation of satellite galaxies and discuss our results in the context of the analogous total-to-stellar mass relation for central galaxies, and numerical predictions for the total-to-stellar mass relation of subhalos. We separately constrain the total masses as a function of cluster-centric distance to assess any level of mass segregation and tidal stripping within clusters. Similar to the total-to-stellar mass relation, we put our results in context with the aid of semi-analytical predictions for the resulting mass segregation in numerical simulations. Finally, we present weak lensing constraints on the average mass of subhalos hosting UDGs in massive clusters, and discuss the implications of our results and possible ways forward.
Location: Jadwin A06
Date/Time: 04/21/17 at 11:50 pm - 04/21/17 at 1:15 pm
Category: Gravity Group Seminar