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We performed a deep wide-field (6.76 deg^2) near-infrared survey with theVISTA telescope that covers the entire extent of the Carina nebula complex(CNC). The point-source catalog created from these data contains around fourmillion individual objects down to masses of 0.1 M_sun. We present astatistical study of the large-scale spatial distribution and an investigationof the clustering properties of infrared-excesses objects, which are used totrace disk-bearing young stellar objects (YSOs). We find that a (J - H) versus(Ks - [4.5]) color-color diagram is well suited to tracing the population ofYSO-candidates (cYSOs) by their infrared excess. We identify 8781 sources withstrong infrared excess, which we consider as cYSOs. This sample is used toinvestigate the spatial distribution of the cYSOs with a nearest-neighboranalysis. The surface density distribution of cYSOs agrees well with the shapeof the clouds as seen in our Herschel far-infrared survey. The strong declinein the surface density of excess sources outside the area of the cloudssupports the hypothesis that our excess-selected sample consists predominantlyof cYSOs with a low level of background contamination. This analysis allows usto identify 14 groups of cYSOs outside the central area. Our results suggestthat the total population of cYSOs in the CNC comprises about 164000 objects,with a substantial fraction (~35%) located in the northern, still not wellstudied parts. Our cluster analysis suggests that roughly half of the cYSOsconstitute a non-clustered, dispersed population.

The VISTA Carina Nebula Survey II. Spatial distribution of the infrared-excess-selected young stellar population