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An X-Ray Detected Group of Quiescent Early-Type Galaxies at<i>z</i>= 1.6 in the Chandra Deep Field South
Abstract We report the discovery of an X-ray group of galaxies located at a high redshift of $ z$$ =$ 1.61 in the Chandra Deep Field South. Based on 4 Ms Chandra data, the group is first identified as an extended X-ray source. We have used a wealth of deep …