A WFC3 Grism Emission Line Redshift Catalog in the GOODS-South Field
Aaron M. Morris, Dale D. Kocevski, Jonathan R. Trump, Benjamin J., Weiner, Nimish P. Hathi, Guillermo Barro, Tomas Dahlen, Sandra M. Faber,, Steven L. Finkelstein, Adriano Fontana, Henry C. Ferguson, Norman A. Grogin,, Ruth Gr\"utzbauch, Yicheng Guo, Li-Ting Hsu

TL;DR
This paper presents a new catalog of grism spectroscopic redshifts for over 1000 galaxies in the GOODS-South field, improving redshift accuracy and identifying new galaxy pairs at high redshift.
Contribution
The study provides a comprehensive grism-based redshift catalog in GOODS-South, including many new redshifts and galaxy pairs, enhancing the data available for galaxy evolution research.
Findings
Redshift accuracy of sigma_NMAD=0.0028 for grism data.
Identification of 234 new redshifts at z>1.5.
Discovery of 20 galaxy pair candidates, including four at z~2.
Abstract
We combine HST/WFC3 imaging and G141 grism observations from the CANDELS and 3D-HST surveys to produce a catalog of grism spectroscopic redshifts for galaxies in the CANDELS/GOODS-South field. The WFC3/G141 grism spectra cover a wavelength range of 1.1<lambda<1.7 microns with a resolving power of R~130 for point sources, thus providing rest-frame optical spectra for galaxies out to z~3.5. The catalog is selected in the H-band (F160W) and includes both galaxies with and without previously published spectroscopic redshifts. Grism spectra are extracted for all H-band detected galaxies with H<24 and a CANDELS photometric redshift z_phot > 0.6. The resulting spectra are visually inspected to identify emission lines and redshifts are determined using cross-correlation with empirical spectral templates. To establish the accuracy of our redshifts, we compare our results against high-quality…
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