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We combine HST/WFC3 imaging and G141 grism observations from the CANDELS and3D-HST surveys to produce a catalog of grism spectroscopic redshifts forgalaxies in the CANDELS/GOODS-South field. The WFC3/G141 grism spectra cover awavelength range of 1.1<lambda<1.7 microns with a resolving power of R~130 forpoint sources, thus providing rest-frame optical spectra for galaxies out toz~3.5. The catalog is selected in the H-band (F160W) and includes both galaxieswith and without previously published spectroscopic redshifts. Grism spectraare extracted for all H-band detected galaxies with H<24 and a CANDELSphotometric redshift z_phot > 0.6. The resulting spectra are visually inspectedto identify emission lines and redshifts are determined using cross-correlationwith empirical spectral templates. To establish the accuracy of our redshifts,we compare our results against high-quality spectroscopic redshifts from theliterature. Using a sample of 411 control galaxies, this analysis yields aprecision of sigma_NMAD=0.0028 for the grism-derived redshifts, which isconsistent with the accuracy reported by the 3D-HST team. Our final catalogcovers an area of 153 square arcmin and contains 1019 redshifts for galaxies inGOODS-S. Roughly 60% (608/1019) of these redshifts are for galaxies with nopreviously published spectroscopic redshift. These new redshifts span a rangeof 0.677 < z < 3.456 and have a median redshift of z=1.282. The catalogcontains a total of 234 new redshifts for galaxies at z>1.5. In addition, wepresent 20 galaxy pair candidates identified for the first time using the grismredshifts in our catalog, including four new galaxy pairs at z~2, nearlydoubling the number of such pairs previously identified.

A WFC3 Grism Emission Line Redshift Catalog in the GOODS-South Field