Speaker
Description
Whether we try to observe the splashback, edge, or depletion radius (as well as sub-definitions thereof), the vast majority of experimental inferences are based on some type of spherically averaged, projected density profile. Commonly, the radius where the density slope is steepest is taken as the halo boundary, but this definition is particularly sensitive to the observational tracer and to methodological details. In this talk, I propose a new parameter space that includes a so-called truncation radius. This scale can be measured more robustly via a novel fitting function, exhibits fewer degenracies than previous parameters of the same kind, and correlates tightly with theoretical definitions of the halo boundary such as the splashback radius. This new framework has already been successfully applied to data.
