Dependence of the dynamical properties of light-cone simulation dark matter halos on their environment

Abstract: We study the dependence of a variety of DM halo properties (shape, spin, virialisation status) on different environments in a whole-sky ΛCDM light-cone halo catalogue extending to z ∼ 0.65, using a simple and well-defined halo isolation criterion. Using this definition of the environment we study if and how the DM halo-properties and their interrelations depend on their environment. We also study the relative orientations of the spin- and shape- vectors of DM halos with their isolation, as well as the alignment of the shape- and the spin- vectors of neighbouring DM halos for a vast range of separations. Lastly, we focus on halo pairs, which are encountered in a variety of isolation states in our catalogue and, specifically, we study how the shape- and spin- alignments of halo-pairs is dependent on the isolation of the pair. The latter can give insight in the formation and evolution of halos formed under the dynamical interaction of their nearest neighbour in a region devoid of other massive halos, i.e. not affected by the ambient tidal field.

general relativity and quantum cosmologyHEP - latticeHEP - phenomenologyHEP - theorymathematical physics

Audience: researchers in the topic

High Energy Theory, Gravity and Cosmology Seminars @ NTUA