Abstract
Observing the neutral Hydrogen (HI) distribution across the Universe via
redshifted 21-cm line Intensity Mapping (IM) constitutes a powerful probe for
cosmology. However, this redshifted 21cm signal is obscured by the foreground
emission. This paper addresses the capabilities of the BINGO survey to separate
such signals. Specifically, this paper (a) looks in detail at the different
residuals left over by foreground components, (b) shows that a noise-corrected
spectrum is unbiased and (c) shows that we understand the remaining systematic
residuals by analyzing non-zero contributions to the three point function. We
use the Generalized Needlet Internal Linear Combination (GNILC), which we apply
to sky simulations of the BINGO experiment for each redshift bin of the survey.
We present our recovery of the redshifted 21-cm signal from sky simulations of
the BINGO experiment including foreground components. We test the recovery of
the 21-cm signal through the angular power spectrum at different redshifts, as
well as the recovery of its non-Gaussian distribution through a bispectrum
analysis. We find that non-Gaussianities from the original foreground maps can
be removed down to, at least, the noise limit of the BINGO survey with such
techniques. Our bispectrum analysis yields strong tests of the level of the
residual foreground contamination in the recovered 21-cm signal, thereby
allowing us to both optimize and validate our component separation analysis.
(Abridged)
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