Chapter 8 Structure Formation Particle Astrophysics Cosmology SS
- Slides: 14
Chapter 8 Structure Formation Particle Astrophysics & Cosmology SS 2008 1
Galaxy distribution Particle Astrophysics & Cosmology SS 2008 2
Galaxy distribution Simulated and observed galaxy distributions: which is which? Particle Astrophysics & Cosmology SS 2008 3
Galaxy distribution … the answer Particle Astrophysics & Cosmology SS 2008 4
Numerical CDM simulations Simulated large-scale structure for different cosmologies Particle Astrophysics & Cosmology SS 2008 5
Numerical CDM simulations The Millennium simulation Particle Astrophysics & Cosmology SS 2008 6
Numerical CDM simulations Computational efforts … Particle Astrophysics & Cosmology SS 2008 7
Numerical CDM simulations Movies cluster large galaxy Particle Astrophysics & Cosmology SS 2008 8
Simulations and observations Power spectrum of galaxy distribution is accurately reproduced by simulations Particle Astrophysics & Cosmology SS 2008 9
Simulations and observations hot dark matter is out! Particle Astrophysics & Cosmology SS 2008 10
Problems with CDM Tully-Fischer relation is offset Particle Astrophysics & Cosmology SS 2008 11
Problems with CDM galaxy Milky Way possesses too few satellite halos cluster (“missing satellites”) works for Virgo Cluster Particle Astrophysics & Cosmology SS 2008 12
Problems with CDM galaxy cluster Rotation curve of a dwarf galaxy: NFW profile ovepredicts central densities of DM in galaxies (‘cusp problem’) dashed: yellow: red: magenta: blue: Particle Astrophysics & Cosmology SS 2008 NFW halo stars gas Burkert halo total 13
Web sites for numerical simulations http: //www. mpa-garching. mpg. de/~volker/gadget/index. html 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 Particle Astrophysics & Cosmology SS 2008 14
