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American Astronomical Society, Astrophysical Journal Supplement, 2(225), p. 27, 2016

DOI: 10.3847/0067-0049/225/2/27

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

Journal article published in 2015 by Ivelina G. Momcheva, Gabriel B. Brammer ORCID, Pieter G. van Dokkum ORCID, Rosalind E. Skelton ORCID, Katherine E. Whitaker ORCID, Erica J. Nelson, Mattia Fumagalli, Michael V. Maseda, Marijn Franx ORCID, Joel Leja ORCID, Hans-Walter Rix ORCID, Natascha M. Förster Schreiber, Rachel Bezanson ORCID, Elisabete Da Cunha, Claire Dickey and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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 $H_{140}$ imaging, parallel ACS G800L spectroscopy, and parallel $I_{814}$ imaging. In a previous paper, 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 (PI: B. Weiner). We developed software to automatically and optimally extract interlaced two-dimensional (2D) and one-dimensional (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 redshifts and line strengths (where available) for 22,548 unique objects down to ${{JH}}_{\mathrm{IR}}≤ 24$ (79,609 unique objects down to ${{JH}}_{\mathrm{IR}}≤ 26$). Of these, 5459 galaxies are at $z > 1.5$ and 9621 are at $0.7