A not negligible fraction (similar to 15%) of X-ray sources detected in the 1 Msec observation of the Chandra Deep Field South (CDFS) are not detected down to Rsimilar or equal to 27. however they are registered in deep near-IR imaging. We use deep multicolor photometry from the VLT (FORS+ISAAC instruments), covering a broad wavelength range, to discuss the adequacy of such techniques for X-ray selected sources and to constrain the nature of this optically faint population.
Chandra Deep Field South: the optically faint population
ROSATI, Piero;
2003
Abstract
A not negligible fraction (similar to 15%) of X-ray sources detected in the 1 Msec observation of the Chandra Deep Field South (CDFS) are not detected down to Rsimilar or equal to 27. however they are registered in deep near-IR imaging. We use deep multicolor photometry from the VLT (FORS+ISAAC instruments), covering a broad wavelength range, to discuss the adequacy of such techniques for X-ray selected sources and to constrain the nature of this optically faint population.File in questo prodotto:
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