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Particle Astrophysics & Cosmology SS 20081 Chapter 8 Structure Formation.

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Presentation on theme: "Particle Astrophysics & Cosmology SS 20081 Chapter 8 Structure Formation."— Presentation transcript:

1 Particle Astrophysics & Cosmology SS 20081 Chapter 8 Structure Formation

2 Particle Astrophysics & Cosmology SS 20082 Galaxy distribution

3 Particle Astrophysics & Cosmology SS 20083 Galaxy distribution Simulated and observed galaxy distributions: which is which?

4 Particle Astrophysics & Cosmology SS 20084 Galaxy distribution … the answer

5 Particle Astrophysics & Cosmology SS 20085 Numerical  CDM simulations Simulated large-scale structure for different cosmologies

6 Particle Astrophysics & Cosmology SS 20086 Numerical  CDM simulations The Millennium simulation

7 Particle Astrophysics & Cosmology SS 20087 Numerical  CDM simulations Computational efforts …

8 Particle Astrophysics & Cosmology SS 20088 Numerical  CDM simulations cluster large galaxy Movies

9 Particle Astrophysics & Cosmology SS 20089 Simulations and observations Power spectrum of galaxy distribution is accurately reproduced by simulations

10 Particle Astrophysics & Cosmology SS 200810 Simulations and observations hot dark matter is out!

11 Particle Astrophysics & Cosmology SS 200811 Problems with  CDM Tully-Fischer relation is offset

12 Particle Astrophysics & Cosmology SS 200812 Problems with  CDM galaxy cluster Milky Way possesses too few satellite halos (“missing satellites”) works for Virgo Cluster

13 Particle Astrophysics & Cosmology SS 200813 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

14 Particle Astrophysics & Cosmology SS 200814 Web sites for numerical simulations http://www.mpa-garching.mpg.de/~volker/gadget/index.html http://www.mpa-garching.mpg.de/galform/http://www.mpa-garching.mpg.de/galform/millennium http://www.virgo.dur.ac.uk/new/index.php http://www.aip.de/People/MSteinmetz/Movies.html


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