Galactic Rotation Curve

• a familiar example: Solar System rotation curve
• the Milky Way data: here and here (Przemek+ 2019)

Milky Way Dark Matter

• Wut?!?
• list of candidates from the conventional to the exotic

Galaxies

The Realm of the Nebulae

• What are these nebulae? are they like these nebulae?
• Curtis-Shapley debate (1920)
• Hubble (the man) discovers a Cephied variable star in M31
• Hubble (the telescope): Cephieds in M100

Galaxy Demographics

• sprial: face-on, edge-on
• elliptical
• Irregular: LMC, SMC

Galaxy Rotation Curves

• Data: M33, M31
  Some examples of typical rotation curves
• Interpretation