Gas Rich Mergers and Disk Galaxy Formation
Mergers of galaxies are common in their evolution. This movie shows the evolution
of a galaxy with similar mass to our own Milky Way, commencing shortly after the Big Bang. The simulation is in a fully cosmological setting, according to our knowledge of Big Bang cosmology.
This particular galaxy has a rich merging history, including a major merger at redshift of ~1, i.e. at a time when the Universe was almost half
its current age. A large disk reforms from gas left over after the merger, and from subsequent gaseous accretion.