The Milky Way

MT

• Draw a sketch of the galaxy edge-on

• what's the rotation curve if there were only the supremassive BH, if it were constant density, the one actually measured?

• What is Sag A*? How do we know its properties? How can you constrain the compactness?

• what does this imply? about the density of DM? do you know of any physical process which would lead to this r-dependence of density?

• where are the globular clusters? how many are there?

• Draw a sketch of the Milky Way? Label distances. What are the stellar populations and scale heights (4 of them not including globular clusters)?
  • What is the density of halo stars?
  • What is the density of stars in the solar neighborhood? (AB)

• How are Milky Way rotation curves measured?
  • Inside the solar orbit?
  • Outside the solar orbit?
  • How do the error bars compare?

Astrophysics