Speaker
Description
Satellite galaxies are observable tracers of the dark matter subhalos, and are subject to the same gravitational influence of the main halo. Hence, the radial distribution of the satellite galaxies can probe the main halo’s density profile and the associated physical boundary. In this talk, I will discuss the observed satellite radial profiles of Milky Way-mass systems from the SAGA Survey, and how this result connects to our theoretical understanding. In addition, at a fixed host halo mass, it is well known that the number of subhalos is correlated with other secondary halo properties such as the halo formation time and the concentration parameter. We found such correlation varying with the radial ranges of the selected subhalos, and showing an interesting connection to the physical halo boundary. This result can inform future observations on satellite systems to better probe the physical halo boundary and unobservable halo properties.
