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The Milky Way - PowerPoint PPT Presentation


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The Milky Way Structure of the Milky Way The Milky Way Components of the Milky Way Disk Population I stars Open clusters HII regions Bulge Population II stars Halo Globular clusters Omega Centauri Stellar Populations M100 Finding Our Place Globular Clusters evenly distributed

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Presentation Transcript
components of the milky way
Components of the Milky Way
  • Disk
    • Population I stars
    • Open clusters
    • HII regions
  • Bulge
    • Population II stars
  • Halo
    • Globular clusters
finding our place
Finding Our Place

Globular Clusters evenly distributed

Early view

Sun at center

Sun

Globular Clusters unevenly distributed

Harlow Shapley

mapping the galaxy
Mapping the Galaxy
  • Visible Light
    • Strong interstellar absorption
    • We can see only 4000 - 5000 pcs
  • Radio Light
    • Can observe entire galaxy
21 cm radiation
21-cm Radiation

Electron

Proton

mapping the galaxy11

Wavelength

Mapping the Galaxy
  • H clouds in different spiral arms will have different Doppler Shifts

Sun

observed rotation curve
Observed Rotation Curve

Keplerian Orbits

dark matter
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