Particle Astrophysics & Cosmology SS 20081 Chapter 7 Dark Matter.

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Presentation transcript:

Particle Astrophysics & Cosmology SS Chapter 7 Dark Matter

Particle Astrophysics & Cosmology SS Galaxies: face-on view a galaxy like our Milky Way: stars, ~ 50 kpc diameter NGC1232

Particle Astrophysics & Cosmology SS Galaxies: edge-on view central stellar bulge, stellar disk, interstellar medium (gas and dust) NGC4565

Particle Astrophysics & Cosmology SS Galaxy groups a few up to ~ 100 galaxies

Particle Astrophysics & Cosmology SS Galaxy clusters up to a few 1000 galaxies a few Mpc total size

Particle Astrophysics & Cosmology SS Density fluctuations without DM

Particle Astrophysics & Cosmology SS Rotation curves of galaxies rotating gaseous disk (HI) rotation velocity v(r) from Doppler shift

Particle Astrophysics & Cosmology SS Galaxy kinematics Isovelocity contours v(x,y) movie

Particle Astrophysics & Cosmology SS Galaxy kinematics a real galaxy (NGC2541)column density of neutral hydrogen optical image(grey/white) and isovelocity contours

Particle Astrophysics & Cosmology SS A movie of v(x,y) model galaxy real galaxy (NGC2541)

Particle Astrophysics & Cosmology SS Measured rotation curve radial distribution of stellar light rotation curve with stellar and gaseous contribution

Particle Astrophysics & Cosmology SS NFW profile vs. observation An extreme case: dwarf galaxy DDO 47 with mass M  M  NFW overpredicts central velocities  “cusp problem” NFW Burkert + obs. points dark gas stars

Particle Astrophysics & Cosmology SS X-ray halos of galaxy clusters Cluster A3528 black ellipses: optically visible galaxies colour: X-ray emission

Particle Astrophysics & Cosmology SS Total mass in galaxy clusters distribution of mass in a galaxy clusters

Particle Astrophysics & Cosmology SS Total mass in galaxy clusters rotation curve of a dwarf galaxy

Particle Astrophysics & Cosmology SS Gravitational lensing by galaxy clusters

Particle Astrophysics & Cosmology SS Gravitational lensing by galaxy clusters

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

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

Particle Astrophysics & Cosmology SS Observations

Particle Astrophysics & Cosmology SS Simulations and observations simulations and observations agree on large scales

Particle Astrophysics & Cosmology SS Tully-Fisher relation

Particle Astrophysics & Cosmology SS ‘Missing satellites’ galaxy cluster Virgo Cluster: agreement Milky Way: large discrepancy

Particle Astrophysics & Cosmology SS Web sites for numerical simulations

Particle Astrophysics & Cosmology SS WIMP search

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