Subhalos in the real Universe: satellite galaxy-galaxy lensing

Tue, November 03, 2015

I present galaxy-galaxy lensing measurements of the total masses of satellite galaxies in galaxy groups and clusters, obtained by combining high-quality imaging data with large spectroscopic galaxy catalogs. I focus on the overlap between the Kilo-Degree Survey (KiDS) and the Galaxy And Mass Assembly (GAMA) survey and present preliminary results on massive clusters from the Canadian Cluster Comparison Project (CCCP). The high purity of the resulting satellite catalogs allow us to cleanly interpret the galaxy-galaxy lensing signal as coming from the subhalos that host these galaxies. I compare these results with predictions from numerical simulations and results for central galaxies, and discuss the potential of satellite galaxy-galaxy lensing measurements as probes of galaxy formation and cosmology.