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Spatially resolved Hα maps and sizes of 57 strongly star-forming galaxies at z ~ 1 from 3D-HST: evidence for rapid inside-out assembly of disk galaxies

Nelson, Erica; van Dokkum, P.G.; Brammer, Gabriel; Forster Schreiber, Natascha; Franx, Marijn; Fumagalli, Mattia; Patel, Shannon; Rix, Hans-Walter; Skelton, Rosalind E; Bezanson, Rachel; da Cunha, Elisabete


We investigate the buildup of galaxies at z ~ 1 using maps of Hα and stellar continuum emission for a sample of 57 galaxies with rest-frame Hα equivalent widths >100 Å in the 3D-HST grism survey. We find that the Hα emission broadly follows the rest-frame R-band light but that it is typically somewhat more extended and clumpy. We quantify the spatial distribution with the half-light radius. The median Hα effective radius re (Hα) is 4.2 ± 0.1 kpc but the sizes span a large range, from compact...[Show more]

CollectionsANU Research Publications
Date published: 2012
Type: Journal article
Source: Astrophysical Journal Letters
DOI: 10.1088/2041-8205/747/2/L28


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