SHAO Astrophysics Colloquium

Title：Galaxy formation in the context of concordance cosmology: confront theory with observations 

Speaker: Qi Guo (National Astronomical Observatories, CAS.)

Time: 3:30 pm, June 07 (Thursday)

Location: Lecture Hall, 3rd floor

Abstract:

It has made great progress in the field of galaxy formation and cosmology in the past 30 years. Here I will highlight recent progresses  and challenges in galaxy formation models, by comparing model predictions with observations.  In particular, I will also present our recent work to use galaxy formation models to explain the formation of a special population of dwarf galaxies, the ultra-diffuse dwarf galaxies (UDG). The UDGs have luminosity of typical dwarf galaxy but with sizes as large as typical L* galaxies.  They are preferentially discovered in high dense region, yet lack of tidal features.  A great attention has been drawn on the origin of this population. I will show that the UDGs are genuine dwarf galaxies rather than failed L* galaxies.