  We produce simulations of emission of the atomic CII line in large sky fields
in order to determine the current prospects for mapping this line during the
high redshift Epoch of Reionization. We estimate the CII line intensity,
redshift evolution and spatial fluctuations using observational relations
between CII emission and the SFR in a galaxy for the frequency range of 200 GHz
to 300 GHz. We obtained a frequency averaged intensity of CII emission of ${\rm
I_{\rm CII}=(4 \pm 2)\times10^{2}\, Jy\, \rm sr^{-1}}$ in the redshift range
$z\, \sim\, 5.3\, -\, 8.5$. Observations of CII emission in this frequency
range will suffer contamination from emission lines at lower redshifts, in
particular from the CO rotation lines. For the relevant frequency range we
estimated the CO contamination (originated in emission from galaxies at $z\,
<\, 2.5$), using simulations, to be ${\rm I_{\rm CO} \approx 10^{3}\, Jy \,
sr^{-1}}$ and independently confirmed the result based in observational
relations. We generated maps as a function of angle and frequency using
detailed simulations of the CII and CO emission across several redshifts in
order to properly take into account the observational pipeline and light cone
effects. In order to reduce the foreground contamination we found that we
should mask galaxies below redshifts $\sim 2.5$ with a CO flux in one of the
CO(J:2-1) to CO(J:6-5) lines higher than ${\rm 5\times 10^{-22}\, W\ m^{-2}}$
or a AB magnitude lower than ${\rm m_{\rm K}\, =\, 22}$. We estimate that the
additional continuum contamination is of the order of ${\rm 10^{5}\, Jy\,
sr^{-1}}$. It is also considered the possibility of cross correlating
foreground lines with galaxies in order to probe the intensity of the
foregrounds.

Astrophysics of Galaxies;Cosmology and Nongalactic Astrophysics