Characterizing the Nature of Optical Drop-Outs and z >= 6-10 Galaxies Behind the Lensing Cluster Abell 1835

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Chandra Proposal Id #07700830

Scientific paper

We propose to obtain deep, high angular resolution images with ACIS of the gravitational lensing cluster Abell 1835 in which our recent ultra-deep optical to near-IR observations have revealed an interesting sample of faint optical dropouts. These observations (detections or upper limits) will provide crucial information to characterize the nature of these sources (intermediate redshift ERO, possibly some faint EXO, or true z>7 starbursts) and possibly to confirm the suspected AGN nature of the high-z (originally z=10., now z~7-8) galaxy candidate of Pello et al. (2004). The combined dataset of X-ray, optical and near-IR imaging from Chandra, VLT, HST, and SPITZER will offer us - thanks to strong gravitational lensing - a unique insight into faint optical dropout objects.

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