A WFC3 GRISM emission line Redshift catalog in the Goods-South Field
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506 (United States)
- Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)
- Steward Observatory, 933 N. Cherry Street, University of Arizona, Tucson, AZ 85721 (United States)
- Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, F-13388, Marseille (France)
- UCO/Lick Observatory and Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)
- Space Telescope Science Institute, Baltimore, MD 21218 (United States)
- The University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712 (United States)
- INAF Osservatorio Astronomico di Roma, Via Frascati 33, I-00040 Monteporzio (RM) (Italy)
- School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD (United Kingdom)
- Max-Planck-Institut für extraterrestrische Physik, Giessen-bachstrasse D-85748 Garching (Germany)
- Department of Physics and Astronomy, Colby College, Waterville, ME (United States)
- Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth PO1 3FX (United Kingdom)
We combine Hubble Space Telescope (HST)/Wide Field Camera3 (WFC3) imaging and G141 grism observations from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (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⩽λ⩽1.7 μm 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{sub 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 spectroscopic redshifts from the literature. Using a sample of 411 control galaxies, this analysis yields a precision of σ{sub NMAD}=0.0028 for the grism-derived redshifts, which is consistent with the accuracy reported by the 3D-HST team. Our final catalog covers an area of 153 arcmin{sup 2} and contains 1019 redshifts for galaxies in GOODS-S. Roughly 60% (608/1019) of these redshifts are for galaxies with no previously published spectroscopic redshift. These new redshifts span a range of 0.677⩽z⩽3.456 and have a median redshift of z = 1.282. The catalog contains a total of 234 new redshifts for galaxies at z>1.5. In addition, we present 20 galaxy pair candidates identified for the first time using the grism redshifts in our catalog, including four new galaxy pairs at z∼2, nearly doubling the number of such pairs previously identified.
- OSTI ID:
- 22879503
- Journal Information:
- The Astronomical Journal (Online), Vol. 149, Issue 6; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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