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)

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?