Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2012-02-08
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
ApJ Letters, in press. The public 3D-HST website is http://3dhst.research.yale.edu/Home.html
Scientific paper
We investigate the build-up of galaxies at z~1 using maps of Halpha and stellar continuum emission for a sample of 57 galaxies with rest-frame Halpha equivalent widths >100 Angstroms in the 3D-HST grism survey. We find that the Halpha 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 Halpha effective radius r_e(Halpha) is 4.2+-0.1 kpc but the sizes span a large range, from compact objects with r_e(Halpha) ~ 1.0 kpc to extended disks with r_e(Halpha) ~ 15 kpc. Comparing Halpha sizes to continuum sizes, we find
Bezanson Rachel
Brammer Gabriel
da Cunha Elisabete
Forster Schreiber Natascha
Franx Marijn
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