Abstract Details
| Name: Aseem Paranjape Affiliation: IUCAA Pune Conference ID: ASI2018_1725 Title : Recent insights into dark halo assembly and implications for galaxy evolution Authors and Co-Authors : Ravi K. Sheth, UPenn; Oliver Hahn, OCA Nice; Isha Pahwa, IUCAA Abstract Type : Invited Abstract Category : Plenary Abstract : The gravitational potential wells of dark matter haloes form the cradles for the formation and evolution of galaxies and the IGM. The assembly history of dark haloes is therefore expected to affect the spatial distribution and properties of galaxies. With the advent of large volume surveys such as the Sloan Digital Sky Survey, this galaxy-halo connection is now being explored in great depth and with high accuracy. Although simple models connecting dark halo mass to observed galaxy properties work quite well in describing many properties of the observed Cosmic Web, some puzzles are yet to be explained. Among these is the observation of `galactic conformity', an effect in which satellite galaxies in groups `know about' the star formation properties of the central galaxy of their group. Potential explanations of this phenomenon that invoke halo mass assembly as the primary driver of group galaxy properties lead to predictions at large spatial scales that are not borne out by the data. In this talk I will introduce the basic phenomenology of halo mass assembly and lessons learnt from numerical simulations and analytical models, highlighting the successes of a dark halo-based model of the distribution of galaxies. I will then discuss the phenomenon of galactic conformity and its possible explanations. |