Particle Astrophysics & Cosmology SS 20081 Chapter 8 Structure Formation.

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Presentation transcript:

Particle Astrophysics & Cosmology SS Chapter 8 Structure Formation

Particle Astrophysics & Cosmology SS Galaxy distribution

Particle Astrophysics & Cosmology SS Galaxy distribution Simulated and observed galaxy distributions: which is which?

Particle Astrophysics & Cosmology SS Galaxy distribution … the answer

Particle Astrophysics & Cosmology SS Numerical  CDM simulations Simulated large-scale structure for different cosmologies

Particle Astrophysics & Cosmology SS Numerical  CDM simulations The Millennium simulation

Particle Astrophysics & Cosmology SS Numerical  CDM simulations Computational efforts …

Particle Astrophysics & Cosmology SS Numerical  CDM simulations cluster large galaxy Movies

Particle Astrophysics & Cosmology SS Simulations and observations Power spectrum of galaxy distribution is accurately reproduced by simulations

Particle Astrophysics & Cosmology SS Simulations and observations hot dark matter is out!

Particle Astrophysics & Cosmology SS Problems with  CDM Tully-Fischer relation is offset

Particle Astrophysics & Cosmology SS Problems with  CDM galaxy cluster Milky Way possesses too few satellite halos (“missing satellites”) works for Virgo Cluster

Particle Astrophysics & Cosmology SS Problems with  CDM galaxy cluster Rotation curve of a dwarf galaxy: NFW profile ovepredicts central densities of DM in galaxies (‘cusp problem’) dashed: NFW halo yellow: stars red: gas magenta: Burkert halo blue: total

Particle Astrophysics & Cosmology SS Web sites for numerical simulations

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