Properties of Galaxies
Spring 2002
    Unique No. 45655 TTH 12:30-2:00 RLM 15.216B


7.1 Historical Introduction

  • Dark matter in the Galactic disk (Oort)
  • Dark matter in the Coma cluster (Zwicky)
  • Stability of cold disks versus bars (Ostriker &Peebles)

7.2 Observational Evidence for Dark Matter

  • HI rotation curves
  • Velocity dispersions in dSph galaxies
  • Satellites of our Galaxy
  • X-ray gas in galaxies and clusters: hydrostatic equilibrium of a hot gas
  • Velocity dispersions of clusters of galaxies
  • Gravitational lenses
  • Large-scale velocity fields

7.3 Regularities in DM Halo Properties

  • Conspiracy between luminous and dark matter to make flat V (r )
  • Parameter correlations
    • Rotation curve decomposition into visible and dark matter components
    • Fundamental plane for dark matter halos
    • Evidence for baryonic compression of dark matter halos
    • Implications for galaxy formation

7.4 What is Dark Matter?

  • MOND: Modified Newtonian Dynamics?
  • Disk dark matter is baryonic: it dissipated
  • Primordial nucleosynthesis constraints on baryonic dark matter
  • Baryonic halos?
    • Things that won’t work: snowballs, M dwarfs, white dwarfs, neutron stars
    • Things that might work: brown dwarfs, black holes of mass 105±1
  • Gravitational microlensing surveys
  • Hot, warm, and cold elementary particles
  • Constraints on neutrino dark matter from dwarf galaxies
  • Direct detection of particle dark matter

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08 November 2001
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