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We present first results from the 3D-HST program, a near-IR spectroscopic survey performed with the Wide Field Camera 3 (WFC3) on the HST. We have used 3D-HST spectra to measure redshifts and Hα equivalent widths (EW Hα) for a complete, stellar mass-limited sample of 34 galaxies at 1 < z < 1.5 with M star > 10 11 M in the COSMOS, GOODS, and AEGIS fields. We(More)
We perform a comprehensive estimate of the frequency of galaxy mergers and their impact on star formation over z ∼ 0.24–0.80 (lookback time T b ∼ 3–7 Gyr) using ∼ 3600 (M ≥ 1 × 10 9 M ⊙) galaxies with GEMS HST , COMBO-17, and Spitzer data. Our results are: (1) Among ∼ 790 high mass (M ≥ 2.5 × 10 10 M ⊙) galaxies, the visually-based merger fraction over z ∼(More)
We present 3D-HST, a near-infrared spectroscopic Treasury program with the Hubble Space Telescope for studying the physical processes that shape galaxies in the distant universe. 3D-HST provides rest-frame optical spectra for a sample of ∼7000 galaxies at 1 < z < 3.5, the epoch when ∼60% of all star formation took place, the number density of quasars(More)
Most massive galaxies are thought to have formed their dense stellar cores in early cosmic epochs. Previous studies have found galaxies with high gas velocity dispersions or small apparent sizes, but so far no objects have been identified with both the stellar structure and the gas dynamics of a forming core. Here we report a candidate core in the process(More)
The Open University's repository of research publications and other research outputs 3D-HST: a wide-field grism spectroscopic survey with the ¡i¿Hubble Space Telescope¡/i¿ Journal Article Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research(More)
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