dark-cosmology.dk /~pela
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
www.dark-cosmology.dk/~pela
Nyborg, 2008
Dust. LyGalaxies
Dark Cosmology Centre | Niels Bohr Institutet | Københavns Universitet
2
Lyman Cooling radiation (~10%)
Stellar sources (~90%)
Metagalactic field (~1%)
Young galaxies should bevisible (Partridge & Peebles, 1967)
3
Analytical models
Osterbrock (1962)Harrington (1973)Neufeld (1990)
4
Analytical models
Dijkstra (2006)
5
Reality
6
Cosmological simulations
Sommer-Larsen et al. (2003)Sommer-Larsen (2006)
Razoumov & Sommer-Larsen (2006)
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Monte CarloL, T, nHI ,
vbulk , Zi
i = C, N, O, Mg, Si, S, Ca, Fe
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Emit photon
Monte Carlo
9
Emit photon
Determine
Monte Carlo
10
Emit photon
Determine uatom
Determine
Monte Carlo
11
Emit photon
^Determine n
Determine uatom
Determine
Escape!
Monte Carlo
12
Galaxies. Multifarious
DLA LAE LBG DRG SMG?Evolutionary sequence?
Viewing angle?
Selection effects?LBGs/DLAs probe two diff. ends of hi-z LF
13
14
15
16
Surface brightness profiles
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Surface brightness profiles
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19
Spectra
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Spectra
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Inhomogeneous medium
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SMC/LMC dust
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Preliminary, shit-hot new results fesc =
0.11
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Preliminary, shit-hot new results fesc =
0.10
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Preliminary, shit-hot new results fesc =
0.21
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Preliminary, shit-hot new results fesc =
0.21
27
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)