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Galaxy clusters as laboratories for dark matter studies

Galaxy clusters as laboratories for dark matter studies. DM exists ! (Zwicky 1933, Clowe et al. 2006) Constraints on DM self-interaction Cluster collisions segregate DM from baryons -- search for emission from DM annihilation/decay

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Galaxy clusters as laboratories for dark matter studies

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  1. Galaxy clusters as laboratories for dark matter studies • DM exists ! (Zwicky 1933, Clowe et al. 2006) • Constraints on DM self-interaction • Cluster collisions segregate DM from baryons -- search for emission from DM annihilation/decay • (weak and strong) gravitational lensing probes total matter distribution, allows mapping of DM distribution Håkon Dahle, ITA, UiO

  2. Gravitational lensing DM in massive galaxy clusters is more concentrated than predicted from N-body simulations of cold dark matter particles (Oguri et al. 2008) DM properties Source population (window to early universe) Cluster “gastrophysics” Håkon Dahle, ITA, UiO

  3. Requirements • Multiwavelength studies (optical, X-ray, IR…etc.) • Use of data from both ground- and space-based observatories • General-purpose, “open”-access, (0.5-1 yr) proposal-cycle based observatories • Ground-based (most often optical/near-IR) studies required from access to space Oslo: • Direct access to 2.56m Nordic Optical Telescope • Current priorities in Oslo are CMB and theory Håkon Dahle, ITA, UiO

  4. ASTRONET and E-ELT • Initiated by European research councils • Science-driven prioritization for ALL of European astronomy on a ~15 year time scale • Science vision and Infrastructure roadmap • Highest priority (ground) : European extremely large telescope (E-ELT), SKA E-ELT: • 42m optical/NIR telescope (ESFRI project) • Decision on construction 2010 • Major construction phase 2012-2017 • <1h at E-ELT = 1 year at Nordic Optical Telescope • Project led by European Southern Observatory (ESO) • ESO currently has 14 member states, runs observatories at 3 sites in Chile (La Silla, Paranal, Atacama Large Millimetre Array in construction), is playing a CERN-like role for European astronomy • Membership cost: ~20-25% of CERN Håkon Dahle, ITA, UiO

  5. Utfordring Håkon Dahle, ITA, UiO

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