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Extreme X-ray/Optical ratio sources (EXOs) are a class of source that are robustly detected in our Chandra Deep Field X-ray data, while being completely undetected in our deep multi-band GOODS HST/ACS data, including the long-wavelength z-band data, yet are detected in the deep GOODS near-IR VLT imaging. These sources have values of Fx/Fopt that are factors of 10–100 times higher than those...
The compilation of the cosmic star formation history suggests that no particular epoch of star formation is seen at redshifts z > 1 (Madau et al. 1996). The rise of the volume-averaged star formation rate from z = 0 to 1 has been attributed to a disk epoch when gaseous galactic disks were converting into stars. In order to search for these predictions deep high resolution images of large...
The first Spitzer images from the GOODS survey have revealed detections of all the Extreme X-ray / Optical sources (‘EXO’s) in the CDF-South. These X-ray sources are completely undetected in our deep optical GOODS HST/ACS imaging, to limits that place them at the extreme end of the Fx/Fopt parameter space, with values about 100 to 1000 times higher than generally found for Active...
In this paper, we address whether the growth of supermassive black-holes has kept pace with the process of galaxy assembly. For this purpose, we first searched the Hubble Ultra Deep Field (HUDF) for “tadpole galaxies”, which have a knot at one end plus an extended tail. They appear dynamically unrelaxed—presumably early-stage mergers—and make up ∼6% of the field galaxy population. Their redshift distribution...
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