Speaker: Helmut Jerjen
Affiliation: The Australian National University
Abstract:
The current structure formation model of Lambda Cold Dark Matter has been successful in explaining observational results mainly from galaxy redshift surveys on large cosmological scales. That has left us wanting more from LCDM, asking deeper questions, and expecting answers. After a brief overview about the achievements in 20th century cosmology, I will introduce the phenomenon of dwarf galaxies, an optical elusive type of galaxies dominated by non-baryonic dark matter only observable in the local universe. They are natural laboratories for confirming predictions from cosmological hydrodynamical simulations of galaxy formation on galaxy scales. However, on those scales the standard cold dark matter paradigm encounters several challenges. I review the “missing satellite problem”, explain some of the other discrepancies with near-field observations and discuss where we stand exploring the “satellite plane problem”, which we recently started to thoroughly study in the dark matter picture.
