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the Milky Way is a messy eater

the Milky Way is a messy eater

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)

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  2. The Milky Way

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  3. The Milky Way
    Disk

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  4. The Milky Way
    Disk
    Spheroid

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  6. The Milky Way
    Disk

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  7. The Milky Way
    Disk
    Spheroid

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  8. The Milky Way
    Disk
    Spheroid
    You are here

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  9. The Milky Way
    Halo

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  10. Dark Matter

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  11. Dark Matter
    F = ma

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

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

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

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  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

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

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

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

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

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  20. Dark Matter
    v /
    r
    1
    r
    v
    r

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

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

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

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

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

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

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

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

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

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  37. Questions?

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