The recent progress in obtaining larger and deeper galaxy catalogues is of fundamental importance for cosmological studies , especially to robustly measure the large scale density fluctuations in the Universe .
The present work uses the Minkowski Functionals ( MF ) to probe the galaxy density field from the WISExSuperCOSMOS ( WSC ) all-sky catalogue by performing tomographic local analyses in five redshift shells ( of thickness \delta z = 0.05 ) in the total range of 0.10 < z < 0.35 .
Here , for the first time , the MF are applied to 2D projections of the galaxy number count ( GNC ) fields with the purpose of looking for regions in the WSC catalogue with unexpected features compared to \Lambda CDM mock realisations .
Our methodology reveals 1 – 3 regions of the GNC maps in each redshift shell with an uncommon behaviour ( extreme regions ) , i.e. , p -value < 1.4 % .
Indeed , the resulting MF curves show signatures that suggest the uncommon behaviour to be associated with the presence of over- or under-densities there , but contamination due to residual foregrounds is not discarded .
Additionally , even though our analyses indicate a good agreement among data and simulations , we identify 1 highly extreme region , seemingly associated to a large clustered distribution of galaxies .
Our results confirm the usefulness of the MF to analyse GNC maps from photometric galaxy datasets .