Cosmological hydrogen recombination: Lyn line feedback and continuum escape
1
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85741 Garching bei München, Germany e-mail: jchluba@mpa-garching.mpg.de
2
Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117997 Moscow, Russia
Received:
20
February
2007
Accepted:
16
September
2007
We compute the corrections to the cosmological hydrogen
recombination history due to delayed feedback of Lyman-series photons
and the escape in the Lyman-continuum. The former
process is expected to slightly delay recombination, while the latter
should allow the medium to recombine a bit faster.
It is shown that the subsequent feedback of released Lyman-n
photons on the lower lying Lyman-
transitions yields a maximal
correction of 
at 
. Including only Lyman-β feedback onto the Lyman-α
transition, accounts for most of the effect.
We find corrections to the cosmic microwave background TT and EE
power spectra with typical peak to peak amplitude 
and 
at 
.
The escape in the Lyman-continuum and feedback of Lyman-α photons on
the photoionization rate of the second shell lead to modifications of
the ionization history which are very small (less than 
).
Key words: cosmic microwave background / cosmology: miscellaneous
© ESO, 2007