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Dwarf spheroidal galaxies as targets for indirect dark matter searches Ewa L. Łokas (Copernicus Center, Warsaw)

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Presentation on theme: "Dwarf spheroidal galaxies as targets for indirect dark matter searches Ewa L. Łokas (Copernicus Center, Warsaw)"— Presentation transcript:

1 Dwarf spheroidal galaxies as targets for indirect dark matter searches Ewa L. Łokas (Copernicus Center, Warsaw)

2 Indirect dark matter searches Gamma rays predicted as annihilation products of SUSY dark matter Imaging Atmospheric Cherenkov Telescope (IACT) arrays: HESS, VERITAS, MAGIC, CACTUS Satellites: GLAST (planned for 2007)

3 Targets for dark matter searches Milky Way (galactic centre, substructure) Very near so flux should be high, but crowded Andromeda galaxy clusters dwarf spheroidal galaxies

4 Dwarf spheroidal galaxies They are believed to be strongly dark matter dominated with M/L > 100 M  /L  Few of them are within 100 kpc Their masses and mass distributions are important for the solution of the overabundance problem and the cusp/core problem They are perfect targets for indirect dark matter searches

5 Draco dwarf Well–studied dwarf at 80 kpc with high M/L > 100 M  /L  Local Group

6 Stellar kinematics in Draco Velocity moments:Dark matter distribution estimated by modelling velocity distribution from kinematic data for 207 stars

7 Dark matter distribution in Draco Dark matter distribution model based on N–body simulations of tidal stripping of dwarfs in the Milky Way potential: α=1 (cusp) α=0 (core) M tot : M  M 

8 CACTUS γ–ray excess from Draco Profumo & Kamionkowski (2006)


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