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Formation of Galaxies

Formation of Galaxies. Spiral versus elliptical Young Universe Collisions and Interactions Starbursts Elliptical galaxies. Formation of a Spiral Galaxy. Formation of an Elliptical Galaxy. Stellar Birthrate in Galaxies. Formation of Galaxies. This picture of galaxy formation is incomplete

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Formation of Galaxies

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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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