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We present the Arizona CDFS Environment Survey (ACES), a recently completed spectroscopic redshift survey of the Chandra Deep Field‐South (CDFS) conducted using the Inamori‐Magellan Areal Camera and Spectrograph on the Magellan‐Baade telescope. In total, the survey targeted 7277 unique sources down to a limiting magnitude of  R  AB  = 24.1, yielding 5080 secure redshifts across the ∼30 arcmin × 30 arcmin extended CDFS region. The ACES data set delivers a significant increase to both the spatial coverage and the sampling density of the spectroscopic observations in the field. Combined with previously published spectroscopic redshifts, ACES now creates a highly complete survey of the galaxy population at  R  &lt; 23, enabling the local galaxy density (or environment) on relatively small scales (∼1 Mpc) to be measured at  z  &lt; 1 in one of the most heavily studied and data‐rich fields in the sky. Here, we describe the motivation, design and implementation of the survey and present a preliminary redshift and environment catalogue. In addition, we utilize the ACES spectroscopic redshift catalogue to assess the quality of photometric redshifts from both the COMBO‐17 and Multiwavelength Survey by Yale‐Chile imaging surveys of the CDFS.

The Arizona CDFS Environment Survey (ACES): A Magellan/IMACS Spectroscopic Survey of the Chandra Deep Field ‐South