the Milky Way is a messy eater

Transcript

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

   View Slide

2. The Milky Way
   

   View Slide

3. The Milky Way
   Disk
   

   View Slide

4. The Milky Way
   Disk
   Spheroid
   

   View Slide

5. View Slide

6. The Milky Way
   Disk
   

   View Slide

7. The Milky Way
   Disk
   Spheroid
   

   View Slide

8. The Milky Way
   Disk
   Spheroid
   You are here
   

   View Slide

9. The Milky Way
   Halo
   

   View Slide

10. Dark Matter
    

    View Slide

11. Dark Matter
    F = ma
    

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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
    

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

19. Dark Matter
    F = ma
    Force = mass x acceleration
    GM1M2
    r2
    Gravity Circular
    motion
    = M1⇥
    v2
    r
    r
    M1
    M2
    v /
    r
    1
    r
    

    View Slide

20. Dark Matter
    v /
    r
    1
    r
    v
    r
    

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

27. View Slide

28. View Slide

29. View Slide

30. View Slide

31. We can use the orbits of streams
    to learn about dark matter!
    

    View Slide

32. View Slide

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

    View Slide

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

    View Slide

35. View Slide

36. View Slide

37. Questions?
    

    View Slide