  Wide-field and deep DECam multi-band photometry, combined with HST data for
the core of the Galactic globular cluster NGC 2808, allowed us to study the
distribution of various stellar sub-populations and stars in different
evolutionary phases out to the cluster tidal radius. We used the C_ugi =
(u-g)-(g-i) index to identify three chemically distinct sub-populations along
the red giant branch and compared their spatial distributions. The most
light-element enriched sub-population (P3) is more centrally concentrated;
however, it shows a more extended distribution in the external regions of the
cluster compared to the primordial (P1) and intermediate (P2) composition
populations. Furthermore, the P3 sub-population centroid is off-center relative
to those of the P1 and P2 groups. We also analyzed the spatial distribution of
horizontal branch stars and found that the relative fraction of red horizontal
branch stars increases for radial distances larger than ~ 1.5' while that of
the blue and hotter stars decreases. These new observations, combined with
literature spectroscopic measurements, suggest that the red horizontal branch
stars are the progeny of all the stellar sub-populations in NGC 2808, i.e.
primordial and light-element enhanced, while the blue stars are possibly the
result of a combination of the "hot-flasher" and the "helium-enhanced"
scenarios. A similar distribution of different red giant branch sub-populations
and horizontal branch stars was also found for the most massive Galactic
globular cluster, omega Cen, based on combined DECam and HST data, which
suggests the two may share a similar origin.
