www.dark-cosmology.dk/~pela

1
Lyman a impact of the intergalactic medium
DARS get-together, Ebeltoft, 2010
Dark Cosmology Centre Niels Bohr Institutet
Københavns Universitet
www.dark-cosmology.dk/pela
2
Lyman a
Put constraints on the epoch of reionization
Crucial for determing redshifts in the hi-z
Universe Map the Cosmic Web Explore young
galaxies and a multitude of of their
properties, e.g
Kinematics and dynamics
Star formation rates
Morphology
Stellar population
Outflows
Gas accretion
Maybe even more I cant think of right now...
3
Observed Ly? profiles
Tapken et al. (2008)
4
Modeling Ly? profiles
Verhamme et al. (2008)
5
Numerical approach
Cosmological N-body hydro simulation
6
IGM transmission
7
IGM transmission
8
Ly? forest
9
Gunn-Peterson trough
10
Homogeneous universe
11
Retarded Hubble flow
12
Retarded Hubble flow
13
Transmission as a function of redshift
z 3.6
14
Impact on the Lya profile
15
Probing the Epoch of Reionization
z 3.6
z 5.7
z 6.3
16
Probing the Epoch of Reionization
Songaila (2004)
17
Probing the Epoch of Reionization
WMAP zre 11.0 1.4
Thomson scattering optical depth
18
Probing the Epoch of Reionization
19
Summary

Retarded Hubble flow may explain at least some of
the asymmetric Ly? profiles