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dark-cosmology.dk /~pela

Dust. Ly  Galaxies. Nyborg, 2008. Dark Cosmology Centre | Niels Bohr Institutet | Københavns Universitet. www.dark-cosmology.dk /~pela. Lyman a. Cooling radiation (~10%). Stellar sources (~90%). Metagalactic field (~1%).  Young galaxies should be

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dark-cosmology.dk /~pela

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  1. Dust. LyGalaxies Nyborg, 2008 Dark Cosmology Centre| Niels Bohr Institutet | Københavns Universitet www.dark-cosmology.dk/~pela

  2. Lyman a • Cooling radiation (~10%) • Stellar sources (~90%) • Metagalactic field (~1%) •  • Young galaxies should be • visible (Partridge & Peebles, 1967)

  3. Analytical models • Osterbrock (1962) • Harrington (1973) • Neufeld (1990)

  4. Analytical models • Dijkstra (2006)

  5. Reality

  6. Razoumov & Sommer-Larsen (2006) Cosmological simulations • Sommer-Larsen et al. (2003) • Sommer-Larsen (2006)

  7. Monte Carlo • L, T, nHI , • vbulk , Zi • i = C, N, O, Mg, • Si, S, Ca, Fe

  8. Monte Carlo • Emit photon

  9. Monte Carlo • Emit photon •  • Determine t

  10. Monte Carlo • Emit photon •  • Determine t •  • Determine uatom

  11. Determinen • ^ • Escape! Monte Carlo • Emit photon •  • Determine t •  • Determine uatom • 

  12. Selection effects? LBGs/DLAs probe two diff. ends of hi-z LF Viewing angle? Galaxies. Multifarious Evolutionary sequence? DLA  LAE  LBG  DRG  SMG?

  13. Surface brightness profiles

  14. Surface brightness profiles

  15. Spectra

  16. Spectra

  17. Inhomogeneous medium

  18. SMC/LMC dust

  19. Preliminary, shit-hot new results fesc = 0.11

  20. Preliminary, shit-hot new results fesc = 0.10

  21. Preliminary, shit-hot new results fesc = 0.21

  22. Preliminary, shit-hot new results fesc = 0.21

  23. Summary • Ly scattering responsible for extended halo • Ly line profile may reveal gas kinematics • Line is broadened ~1000 km s-1 • Anisotropic escape of radiation may explain differences in observed properties, and may even link different types of galaxies • This effect is strengthened by dust • Escape fraction may vary from 10% to 40% (but don’t put your money on this yet)

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