Papers › The 3D-HST Survey: Hubble Space Telescope WFC3/G141 grism spectra, redshifts, and...

The 3D-HST Survey: Hubble Space Telescope WFC3/G141 grism spectra, redshifts, and emission line measurements for ∼100,000 galaxies

7 Oct 2015arXiv:1510.02106links table onlyarchive 2025-07-28

Ivelina G. Momcheva, Gabriel B. Brammer, Pieter G. van Dokkum, Rosalind E. Skelton, Katherine E. Whitaker, Erica J. Nelson, Mattia Fumagalli, Michael V. Maseda, Joel Leja, Marijn Franx, Hans-Walter Rix, Rachel Bezanson, Elisabete Da Cunha, Claire Dickey, Natascha M. Förster Schreiber, Garth Illingworth, Mariska Kriek, Ivo Labbé, Johannes Ulf Lange, Britt F. Lundgren, Daniel Magee, Danilo Marchesini, Pascal Oesch, Camilla Pacifici, Shannon G. Patel, Sedona Price, Tomer Tal, David A. Wake, Arjen van der Wel, Stijn Wuyts

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We present reduced data and data products from the 3D-HST survey, a 248-orbit HST Treasury program. The survey obtained WFC3 G141 grism spectroscopy in four of the five CANDELS fields: AEGIS, COSMOS, GOODS-S, and UDS, along with WFC3 H₁₄₀ imaging, parallel ACS G800L spectroscopy, and parallel I₈₁₄ imaging. In a previous paper (Skelton et al. 2014) we presented photometric catalogs in these four fields and in GOODS-N, the fifth CANDELS field. Here we describe and present the WFC3 G141 spectroscopic data, again augmented with data from GO-1600 in GOODS-N. The data analysis is complicated by the fact that no slits are used: all objects in the WFC3 field are dispersed, and many spectra overlap. We developed software to automatically and optimally extract interlaced 2D and 1D spectra for all objects in the Skelton et al. (2014) photometric catalogs. The 2D spectra and the multi-band photometry were fit simultaneously to determine redshifts and emission line strengths, taking the morphology of the galaxies explicitly into account. The resulting catalog has 98,663 measured redshifts and line strengths down to JH_(IR)≤26 and 22,548 with JH_(IR)≤24, where we comfortably detect continuum emission. Of this sample 5,459 galaxies are at z>1.5 and 9,621 are at 0.7<z<1.5, where Hα falls in the G141 wavelength coverage. Based on comparisons with ground-based spectroscopic redshifts, and on analyses of paired galaxies and repeat observations, the typical redshift error for JH_(IR)≤24 galaxies in our catalog is σ_z ≈0.003 ×(1+z), i.e., one native WFC3 pixel. The 3σ limit for emission line fluxes of point sources is 1.5×10⁻¹⁷ ergs s⁻¹ cm⁻². We show various representations of the full dataset, as well as individual examples that highlight the range of spectra that we find in the survey.

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