Speaker
Dr
Benoit Semelin
(Obs de Paris)
Description
It has been recognized from the start that the high redshift 21 cm signal from the
neutral IGM
during the Epoch of Reionization may been seen as a strong absorption against the CMB
early on as long as the IGM has undergone little heating from X-ray sources. The
difficulty
with simulating this stage of the Reionization is that the strength of the signal
depends on an
accurate computation of the spin temperature of neutral hydrogen including a proper
modeling
of the Wouthuysen-Field effect. We will present results from simulations combining
the full
radiative transfer of both the ionizing continuum and Lyman alpha photons, allowing us to
model the 21cm signal during the early absorption regime. We find a strong (>100 mK)
absorption
signal during a limited period even if we take into account a reasonable contribution
from X-ray
sources.
Primary author
Dr
Benoit Semelin
(Obs de Paris)
