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This paper presents the observations of the Cloud D in the Vela MolecularRidge, obtained with the IRAC camera onboard the Spitzer Space Telescope at thewavelengths \lambda = 3.6, 4.5, 5.8, 8.0 {\mu}m. A photometric catalog of pointsources, covering a field of approximately 1.2 square degrees, has beenextracted and complemented with additional available observational data in themillimeter region. Previous observations of the same region, obtained with theSpitzer MIPS camera in the photometric bands at 24 {\mu}m and 70 {\mu}m, havealso been reconsidered to allow an estimate of the spectral slope of thesources in a wider spectral range. A total of 170,299 point sources, detectedat the 5-sigma sensitivity level in at least one of the IRAC bands, have beenreported in the catalog. There were 8796 sources for which good qualityphotometry was obtained in all four IRAC bands. For this sample, a preliminarycharacterization of the young stellar population based on the determination ofspectral slope is discussed; combining this with diagnostics in thecolor-magnitude and color-color diagrams, the relative population of youngstellar objects in the different evolutionary classes has been estimated and atotal of 637 candidate YSOs have been selected. The main differences in theirrelative abundances have been highlighted and a brief account for their spatialdistribution is given. The star formation rate has been also estimated andcompared with the values derived for other star forming regions. Finally, ananalysis of the spatial distribution of the sources by means of the two-pointcorrelation function shows that the younger population, constituted by theClass I and flat-spectrum sources, is significantly more clustered than theClass II and III sources.

The Spitzer-IRAC Point Source Catalog of the Vela-D Cloud