%0 Journal Article %1 nelson2013radial %A Nelson, Erica June %A van Dokkum, Pieter %A Momcheva, Ivelina %A Brammer, Gabriel %A Lundgren, Britt %A Skelton, Rosalind %A Whitaker, Katherine %A Da Cunha, Elisabete %A Schreiber, Natascha Forster %A Franx, Marijn %A Fumagalli, Mattia %A Kriek, Mariska %A Labbe, Ivo %A Leja, Joel %A Patel, Shannon %A Rix, Hans-Walter %A Schmidt, Kasper %A van der Wel, Arjen %A Wuyts, Stijn %D 2013 %K Galaxy formation star z~1 %T The Radial Distribution of Star Formation in Galaxies at z~1 from the 3D-HST Survey %U http://arxiv.org/abs/1301.0320 %X The assembly of galaxies can be described by the distribution of their star formation as a function of cosmic time. Thanks to the WFC3 grism on HST it is now possible to measure this beyond the local Universe. Here we present the spatial distribution of Halpha emission for a sample of 54 strongly star-forming galaxies at z~1 in the 3D-HST Treasury survey. By stacking the Halpha emission we find that star formation occurred in approximately exponential distributions at z~1, with median Sersic index of n=1.0+-0.2. The stacks are elongated with median axis ratios of b/a=0.58+-0.09 in Halpha, consistent with (possibly thick) disks at random orientation angles. Keck spectra obtained for a subset of eight of the galaxies show clear evidence for rotation, with inclination-corrected velocities of 90 to 330 km/s. The most straightforward interpretation of our results is that star formation in strongly star-forming galaxies at z~1 generally occurred in disks. The disks appear to be "scaled-up" versions of nearby spiral galaxies: they have EW(Halpha)~100 Angstroms out to the solar orbit and they have star formation surface densities above the threshold for driving galactic scale winds.

@article{nelson2013radial, abstract = {The assembly of galaxies can be described by the distribution of their star formation as a function of cosmic time. Thanks to the WFC3 grism on HST it is now possible to measure this beyond the local Universe. Here we present the spatial distribution of Halpha emission for a sample of 54 strongly star-forming galaxies at z~1 in the 3D-HST Treasury survey. By stacking the Halpha emission we find that star formation occurred in approximately exponential distributions at z~1, with median Sersic index of n=1.0+-0.2. The stacks are elongated with median axis ratios of b/a=0.58+-0.09 in Halpha, consistent with (possibly thick) disks at random orientation angles. Keck spectra obtained for a subset of eight of the galaxies show clear evidence for rotation, with inclination-corrected velocities of 90 to 330 km/s. The most straightforward interpretation of our results is that star formation in strongly star-forming galaxies at z~1 generally occurred in disks. The disks appear to be "scaled-up" versions of nearby spiral galaxies: they have EW(Halpha)~100 Angstroms out to the solar orbit and they have star formation surface densities above the threshold for driving galactic scale winds.}, added-at = {2013-01-13T11:10:07.000+0100}, author = {Nelson, Erica June and van Dokkum, Pieter and Momcheva, Ivelina and Brammer, Gabriel and Lundgren, Britt and Skelton, Rosalind and Whitaker, Katherine and Da Cunha, Elisabete and Schreiber, Natascha Forster and Franx, Marijn and Fumagalli, Mattia and Kriek, Mariska and Labbe, Ivo and Leja, Joel and Patel, Shannon and Rix, Hans-Walter and Schmidt, Kasper and van der Wel, Arjen and Wuyts, Stijn}, biburl = {https://www.bibsonomy.org/bibtex/200f90beb7808c489ac30b7f56daa6f7d/geckojhl}, description = {The Radial Distribution of Star Formation in Galaxies at z~1 from the 3D-HST Survey}, interhash = {22c27035c04dc9da6beef797e34dfe3e}, intrahash = {00f90beb7808c489ac30b7f56daa6f7d}, keywords = {Galaxy formation star z~1}, note = {cite arxiv:1301.0320Comment: Accepted for publication in ApJ Letters}, timestamp = {2013-01-13T11:10:07.000+0100}, title = {The Radial Distribution of Star Formation in Galaxies at z~1 from the 3D-HST Survey}, url = {http://arxiv.org/abs/1301.0320}, year = 2013 }