Event

Understanding the complex relations between galaxies and their hosting dark-matter halos is important for theories of galaxy formation and evolution and for the extraction of cosmological information from galaxy surveys. In this talk, I will present recent results on several aspects of this fundamental connection that were obtained using a variety of techniques. First, I will show observational constraints on the halo mass —galaxy size relation for central and satellite galaxies in the SDSS (Rodriguez et al. 2020). Second, I will focus on the secondary dependencies of halo clustering at fixed halo mass, including assembly bias and spin bias. In particular, I will demonstrate that the inversion of the spin bias signal measured at the low mass end is due to the effect of splashback halos, which are distinct halos at the redshift under analysis that still lie in the vicinity of their recent massive hosts (Tucci et al. 2020). In the last part of this talk, I will discuss recent attempts to demonstrate the existence of secondary bias in the galaxy population and propose a potential observational probe for spin bias based on the kinetic Sunyaev Zel’dovich effect (Montero-Dorta et al. 2020).

https://upenn.zoom.us/j/96087984803?pwd=QzZOMjBpclczT00zSDljRFVtOEJwZz09

Meeting ID: 960 8798 4803

Passcode: 454536