the Milky Way is a messy eater

the Milky Way is a messy eater

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Adrian Price-Whelan

April 09, 2013
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  1. The Milky Way is a messy eater. The Milky Way

    is a messy eater. Adrian Price-Whelan (Columbia University)
  2. The Milky Way

  3. The Milky Way Disk

  4. The Milky Way Disk Spheroid

  5. None
  6. The Milky Way Disk

  7. The Milky Way Disk Spheroid

  8. The Milky Way Disk Spheroid You are here

  9. The Milky Way Halo

  10. Dark Matter

  11. Dark Matter F = ma

  12. Dark Matter F = ma Force = mass x acceleration

  13. Dark Matter F = ma Force = mass x acceleration

    GM1M2 r2 Gravity
  14. Dark Matter F = ma Force = mass x acceleration

    GM1M2 r2 Gravity Circular motion = M1⇥ v2 r
  15. Dark Matter F = ma Force = mass x acceleration

    GM1M2 r2 e.g. M2 could be the mass of the Sun M1 could be the mass of a planet Gravity Circular motion = M1⇥ v2 r r M1 M2
  16. Dark Matter F = ma Force = mass x acceleration

    GM1M2 r2 Gravity Circular motion = M1⇥ v2 r r M1 M2
  17. Dark Matter F = ma Force = mass x acceleration

    GM1M2 r2 Gravity Circular motion = M1⇥ v2 r r M1 M2
  18. Dark Matter F = ma Force = mass x acceleration

    GM1M2 r2 Gravity Circular motion = M1⇥ v2 r r M1 M2
  19. Dark Matter F = ma Force = mass x acceleration

    GM1M2 r2 Gravity Circular motion = M1⇥ v2 r r M1 M2 v / r 1 r
  20. Dark Matter v / r 1 r v r

  21. Dark Matter v / r 1 r Predicted v r

  22. Dark Matter v / r 1 r Predicted v r

  23. Dark Matter v / r 1 r Predicted v r

  24. Dark Matter v / r 1 r Predicted v r

    Observed
  25. Dark Matter v / r 1 r Predicted v r

    Observed
  26. Dark Matter v / r 1 r Predicted Dark Matter!

    v r Observed
  27. None
  28. None
  29. None
  30. None
  31. We can use the orbits of streams to learn about

    dark matter!
  32. None
  33. In the neighborhood •What would one of these streams look

    like from the inside?
  34. In the neighborhood •What would one of these streams look

    like from the inside?
  35. None
  36. None
  37. Questions?