All-sky angular power spectra from cleaned WISE$times$SuperCOSMOS galaxy number counts. (arXiv:1812.08182v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Xavier_H/0/1/0/all/0/1">H. S. Xavier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Costa_Duarte_M/0/1/0/all/0/1">M. V. Costa-Duarte</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Balaguera_Antolinez_A/0/1/0/all/0/1">A. Balaguera-Antolínez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bilicki_M/0/1/0/all/0/1">M. Bilicki</a>
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 $elllesssim15$ 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
$ellgeq 15$ agrees with a $Lambda$CDM model with parameters from the Planck
satellite and gives $Omega_{mathrm{c}}=0.254pm0.020$ and
$Omega_{mathrm{b}}<0.065$ at 95% confidence limit when combined with priors
on $H_0$, $A_s$ and $n_s$.
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 $elllesssim15$ 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
$ellgeq 15$ agrees with a $Lambda$CDM model with parameters from the Planck
satellite and gives $Omega_{mathrm{c}}=0.254pm0.020$ and
$Omega_{mathrm{b}}<0.065$ at 95% confidence limit when combined with priors
on $H_0$, $A_s$ and $n_s$.
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