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    A WFC3 Grism Emission Line Redshift Catalog In The GOODS-South Field

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    wfc3grismemission.pdf (1.267Mb)
    Date
    2015-06
    Author
    Morris, Aaron M.
    Kocevski, Dale D.
    Trump, Jonathan R.
    Weiner, Benjamin J.
    Hathi, Nimish P.
    Barro, Guillermo
    Dahlen, Tomas
    Faber, Sandra M.
    Finkelstein, Steven L.
    Fontana, Adriano
    Ferguson, Henry C.
    Grogin, Norman A.
    Grutzbauch, Ruth
    Guo, Yicheng C.
    Hsu, Li-Ting
    Koekemoer, Anton M.
    Koo, David C.
    Mobasher, Bahram
    Pforr, Janine
    Salvato, Mara
    Wiklind, Tommy
    Wuyts, Stijn
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    Abstract
    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 <= lambda <= 1.7 mu m with a resolving power of R similar to 130 for point sources, thus providing rest-frame optical spectra for galaxies out to z similar to 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 spectroscopic redshifts from the literature. Using a sample of 411 control galaxies, this analysis yields a precision of sigma(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(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 similar to 2, nearly doubling the number of such pairs previously identified.
    Department
    Astronomy
    Subject
    catalogs
    galaxies: high-redshift
    techniques: spectroscopic
    hubble-space-telescope
    origins deep survey
    extragalactic legacy
    survey
    star-forming galaxies
    greater-than 1
    photometric redshift
    optical spectroscopy
    quiescent galaxies
    nuclear activity
    data
    reduction
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34502
    Citation
    Morris, Aaron M., Dale D. Kocevski, Jonathan R. Trump, Benjamin J. Weiner, Nimish P. Hathi, Guillermo Barro, Tomas Dahlen et al. >A WFC3 Grism Emission Line Redshift Catalog in the GOODS-South Field.> The Astronomical Journal, Vol. 149, No. 6 (Jun., 2015): 178.
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