21_-_The_Milky_Way - The Plan 21 - The Milky Way Galaxy The...

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21 - The Milky Way Galaxy Harold Shapley Fritz Zwicky Harvard Caltech 2 The Plan • The “discovery” of the Milky Way • The components of the MW • Its size and shape • Some rotation models. • The dreaded dark matter. • The local neighborhood 3 4 “Side” View
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5 “Top” View • Why and how did the spiral arms form? • What is “in” the central bulge? A 4x10 6 Mo black hole. 6 Galactic Profile ~50kpc 8.5kpc Large Halo, ~200kpc dia, of dark matter of unknown material. 7 The Anatomy of the Milky Way 8 Spirals Rotate
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9 Typical Rotation Curves 10 Astro 410 (20min exp.) 2006 11 Milky Way Parameters PARAMETER DISK HALO • Mass 6.6x10 10 Mo 50x10 10 Mo • Diameter 50 kpc ~200kpc • L B 2x10 10 Lo dark • Scale height ~1kpc >2.8kpc • Age <12Gyr pre-galactic 12 Rotation Curve Basics Kepler 3 rd law Recast as a function of M, R and V Mass within radius R ( ) 2 3 2 2 1 2 2 0 2 2 ( ) 4 ( ) R G MP R R P V GM R V GM V R M M r x x dx π π ρ = = = = = =
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21_-_The_Milky_Way - The Plan 21 - The Milky Way Galaxy The...

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