The Milky Way - PowerPoint PPT Presentation

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The Milky Way

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  1. The Milky Way

  2. Structure of the Milky Way

  3. The Milky Way

  4. Components of the Milky Way • Disk • Population I stars • Open clusters • HII regions • Bulge • Population II stars • Halo • Globular clusters

  5. Omega Centauri

  6. Stellar Populations M100

  7. Finding Our Place Globular Clusters evenly distributed Early view Sun at center Sun Globular Clusters unevenly distributed Harlow Shapley

  8. Mapping the Galaxy • Visible Light • Strong interstellar absorption • We can see only 4000 - 5000 pcs • Radio Light • Can observe entire galaxy

  9. 21-cm Radiation Electron Proton

  10. Wavelength Mapping the Galaxy • H clouds in different spiral arms will have different Doppler Shifts Sun

  11. 21-cm Data

  12. Galactic Rotation Curve

  13. Observed Rotation Curve Keplerian Orbits

  14. Dark Matter Halo

  15. Dark Matter • There must be significant amount of mass in the Galaxy in an underluminous form (perhaps as much as 90% of total) • Compact Objects - White Dwarf, Neutron Stars, Black Holes • MACHO’s - MAssive Compact Halo Objects • Planets, Brown Dwarfs • WIMP’s • Weakly Interacting Massive Particles