Aiming to extract cosmological information from linear scales of the WISE \times SuperCOSMOS photometric redshift catalog , we perform a characterization of the systematic effects associated with stellar content , evidencing the presence of contamination and obscuration .
We create an integrated model for these effects ( which together we call ‘ ‘ usurper contamination ’ ’ ) , devise a method to remove both of them simultaneously and show its functionality by applying it to a set of mock catalogs .
When administered to WISE \times SuperCOSMOS data , our method shows to improve the measurements of angular power spectra on scales \ell \lesssim 15 and the extraction of cosmological parameters therefrom , even though a significant excess of power remains at these scales .
When ignoring scales \ell < 15 , we still find strong indications of systematics , albeit these can be localized in the southern equatorial hemisphere .
An independent analysis of the northern hemisphere at \ell \geq 15 agrees with the \Lambda CDM model with parameters from the Planck satellite and gives \Omega _ { c } = 0.254 \pm 0.020 and \Omega _ { \mathrm { b } } < 0.065 at 95 % confidence limit when combined with priors on H _ { 0 } , A _ { s } and n _ { s } .