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We describe the Carnegie-Spitzer-IMACS (CSI) Survey, a wide-field, near-IRselected spectrophotometric redshift survey with IMACS on Magellan-Baade. CSIuses a flux-limited sample of galaxies in Spitzer IRAC 3.6micron imaging ofSWIRE fields to efficiently trace the stellar mass of average galaxies toz~1.5. This paper provides an overview of the survey selection, observations,and processing of the photometry and spectrophotometry. We also describe theanalysis of the data: new methods of fitting synthetic SEDs are used to deriveredshifts, stellar masses, emission line luminosities, and coarse informationon recent star-formation. Our unique methodology for analyzing low-dispersionspectra taken with multilayer prisms in IMACS, combined with panchromaticphotometry from the ultraviolet to the IR, has yielded high quality redshiftsfor 43,347 galaxies in our first 5.3 sq. degs of the SWIRE XMM-LSS field. A newapproach to assessing data quality is also described, and three differentapproaches are used to estimate our redshift errors, with robust agreement.Over the full range of 3.6micron fluxes of our selection, we find typicalredshift uncertainties of sigma_z/(1+z) < 0.015. In comparisons with previouslypublished spectroscopic redshifts we find scatters of sigma_z/(1+z) = 0.011 forgalaxies at 0.7< z< 0.9, and sigma_z/(1+z) = 0.014 for galaxies at 0.9< z< 1.2.For galaxies brighter and fainter than i=23 mag, we find sigma_z/(1+z) = 0.008and sigma_z/(1+z) = 0.022, respectively. Notably, our low-dispersionspectroscopy and analysis yields comparable redshift uncertainties and successrates for both red and blue galaxies, largely eliminating color-basedsystematics that can seriously bias observed dependencies of galaxy evolutionon environment.

The Carnegie-Spitzer-IMACS Redshift Survey of Galaxy Evolution since z=1.5: I. Description and Methodology and More!