1. Galaxy Interactions Intro to Astrophysics James Carroll
Elon University

2. Angular Momentum
Density
Conditions in Protogalactic Clouds

3. Centaurus A Elliptical Galaxy

4. NGC3370 Spiral Galaxy

5. NGC 55 – irregular galaxy
Pink star forming regions and blue (new) star clusters.

6. Leo A – dwarf irregular galaxy

7. Arp 243 – Tidal Tails

8. Whirlpool Galaxy

9. Antennae Galaxy

10. Antennae Galaxies – The dark dust detailes massive molecular clouds that are being compressed during collision. The blue is caused by newly formed stars, formed is a starburst caused by the galactic collision. There are also the pinkish star forming regions.

11. Cartwheel Galaxy

12. Computer Simulations
In 1972, Alar and Jüri Toomre conducted the first computer simulations of galaxy interactions.
They were able to reproduce tidal tails of galaxies.
Their process of collision evolution became known as the Toomre Sequence.