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Jesper Sommer-Larsen Dark Cosmology Centre, Niels Bohr Institute, Copenhagen

Where are the "Missing" GalacticBaryons ?, The z~1 TF relation , Baryon “pinching” of DM haloes , Young Galaxies in Ly-alpha. Jesper Sommer-Larsen Dark Cosmology Centre, Niels Bohr Institute, Copenhagen. Collaborators on the projects:. Laura Portinari, Tuorla, Finland

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Jesper Sommer-Larsen Dark Cosmology Centre, Niels Bohr Institute, Copenhagen

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  1. Where are the "Missing" GalacticBaryons ?, The z~1 TF relation, Baryon “pinching” of DM haloes, Young Galaxies in Ly-alpha Jesper Sommer-Larsen Dark Cosmology Centre, Niels Bohr Institute, Copenhagen

  2. Collaborators on the projects: Laura Portinari, Tuorla, Finland Jesper Rasmussen, Birmingham, UK Kristian Pedersen, Dark, Copenhagen Sune Toft, ESO Kim Nilsson, ESO Johan Fynbo, Dark, Copenhagen Palle Moeller, ESO Peter Laursen, Dark, Copenhagen Richard Bower, Durham, UK Andrew Benson, Oxford, UK Malcolm Fairbairn, Stockholm, Sweden Michael Gustafsson, Stockholm, Sweden

  3. The missing baryons problems 1) Omega_b = <rho_b>/rho_crit = 0.04-0.045. Observed in the Ly-alpha forest at z~2-4, but Omega_* ~ 0.003 at z~0 !! • f_b ~ 0.15 Milky Way: M_vir ~ 8 x 10^11 Msun, so M_* ~ 1.2 x 10^11 Msun, but M_* ~ 6-7 x 10^10 Msun !!

  4. Growth of (Dark Matter) Density Fluctuations by Gravitational Instability in an expanding Universe

  5. The Cosmic Microwave Background

  6. Cosmological Dark Matter Simulation at z=0

  7. First detection ofextended, soft (T~0.4 keV) X-ray emission from the halo of a quiescent disk galaxy (V_c=307 km/s)Pedersen et al., New Astronomy, 11, 465 (2006)< <------------------ 100 kpc ---------------- >

  8. NGC5746:Theory versus Observations

  9. ”External” baryon fractionsSommer-Larsen (2006), ApJL, 644, L1

  10. ”External” baryon fractionsDependence on feedback physics

  11. Disk+bulge, Hot gas, and Virial Massesversus characteristic circular speed

  12. Contribution of baronic galaxy mass using the Gonzalez et al. (2000) velocity function

  13. Warm (T~10^4 K) halo clouds ”High Velocity Clouds”pppppppppppp (Putman & Sommer-Larsen 2006) p ppppTemperature: Density:

  14. Mass distribution of warm halo clouds (”High Velocity Clouds”)

  15. The I-band z=0 Tully-Fisher relation Portinari & Sommer-Larsen (2006, astro-ph/0606531)

  16. The stellar mass z=0 TF relation Portinari & Sommer-Larsen (2006, astro-ph/0606531)

  17. Contribution of baryons to total v_c(R)using Pizagno et al. (2005) observations of ~bulgeless disk galaxies

  18. Evolution of the B-band TF relation from z=1 to 0Portinari & SL (2006)

  19. Evolution of the stellar mass TF from z=1 to 0Portinari & SL (2006)

  20. Baryonic ”pinching” of the (cold) dark matter haloes of…..………...two Milky Way like disk galaxiesGustafsson, Fairbairn & SL (2006) V_c=245 km/s V_c=233 km/s

  21. Orbital structure of dark matter haloes <x> = A * x^w, x = r/r_vir ”Adiabatic” contraction parameters (A,w) = (1,1) Blumenthal et al. (1986) (A,w) ~ (0.8,0.8) Gnedin et al. (2004)

  22. ”Adiabatic” contraction ReconstructionGustafsson, Fairbairn & SL (2006) V_c = 233 km/s

  23. Determination of the (A,w) parametersGustafsson, Fairbairn & SL (2006) V_c = 233 km/s

  24. Detection of gamma-rays from DM annihilation Gustafsson, Fairbairn & SL (2006)

  25. LyResonant Scattering in Young Galaxies Laursen & Sommer-Larsen (2006) www.dark-cosmology.dk DARK Cosmology Centre| Niels Bohr Institutet | Københavns Universitet

  26. Motivation • Observational data from J. Fynbo • Simulation data from J. Sommer-Larsen

  27. Basis • Interpolation onto grid • Lyman-alpha resonant scattering RT by a Monte-Carlo approach Tasitsiomi (2006) Cantalupo et al. (2006) Dijkstra & Haiman (2006) • Data from J. Sommer-Larsen et al.

  28. Results • Imaging • No scattering; yz-plane

  29. Results • Imaging • Scattering; yz-plane

  30. Results • Scattering; xy-plane • Imaging

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