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Galactic Evolution: Collisions, Interactions, and Formation

Explore the dynamic process of galaxy formation through mergers, collisions, and interactions in the early Universe. Witness the growth of spiral and elliptical galaxies amidst starbursts and stellar birthrates.

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Galactic Evolution: Collisions, Interactions, and Formation

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  1. Formation of Galaxies • Spiral versus elliptical • Young Universe • Collisions and Interactions • Starbursts • Elliptical galaxies

  2. Formation of a Spiral Galaxy

  3. Formation of an Elliptical Galaxy

  4. Stellar Birthrate in Galaxies

  5. Formation of Galaxies • This picture of galaxy formation is incomplete • Mergers, collisions, and interactions between galaxies are very important in their formation, particularly in the early stages of the Universe (why?)

  6. Expansion of the Universe • The Universe is expanding • This means that the Universe used to be smaller • In the early stages of the Universe • there were more galaxies • they were closer together • therefore, they interacted more

  7. Young Universe

  8. Young Universe

  9. Young Universe

  10. Young Universe

  11. In which type of galaxy are star’s orbits distributed in random directions? • elliptical galaxies • spiral galaxies • barred spiral galaxies • blue galaxies

  12. Colliding galaxies

  13. The Mice

  14. Cartwheel galaxy

  15. Seyfert’s Sextet

  16. Interacting galaxies

  17. Interacting galaxies

  18. Starburst galaxy – M82

  19. Starburst galaxy – M82

  20. Colliding galaxies Movie

  21. Galaxy interactions • Interactions can rip stars out of galaxies, producing tidal tails • Interactions can disturb gas in and between galaxies, producing starbursts • Collisions can randomize stellar orbits leading to the formation of elliptical galaxies

  22. Formation of an Elliptical Galaxy Movie

  23. Galaxy growth via interactions • Galaxies initially form from mergers of several gas clouds • Galaxies then are changed by interactions • Galaxies grow gradually by galactic cannibalism • Interactions disturb gas leading to starbursts • Collisions can randomize stellar orbits leading to the formation of elliptical galaxies

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