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THE RADIAL DISTRIBUTION OF STAR FORMATION IN GALAXIES AT z similar to 1 FROM THE 3D-HST SURVEY

Nelson, Erica June; van Dokkum, P.G.; Momcheva, Ivelina; Brammer, Gabriel; Lundgren, Britt; Skelton, Rosalind E; Whitaker, Katherine; da Cunha, Elisabete; Forster Schreiber, Natascha; Franx, Marijn; Nelson, Erica; da Cunha, E; Rix, Hans-Walter; van der Wel, Arjen

Description

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 the Hubble Space Telescope (HST) it is now possible to measure this beyond the local Universe. Here we present the spatial distribution of Hα emission for a sample of 54 strongly star-forming galaxies at z ~ 1 in the 3D-HST Treasury survey. By stacking the Hα emission, we find that star formation occurred in approximately exponential distributions at z...[Show more]

dc.contributor.authorNelson, Erica June
dc.contributor.authorvan Dokkum, P.G.
dc.contributor.authorMomcheva, Ivelina
dc.contributor.authorBrammer, Gabriel
dc.contributor.authorLundgren, Britt
dc.contributor.authorSkelton, Rosalind E
dc.contributor.authorWhitaker, Katherine
dc.contributor.authorda Cunha, Elisabete
dc.contributor.authorForster Schreiber, Natascha
dc.contributor.authorFranx, Marijn
dc.contributor.authorNelson, Erica
dc.contributor.authorda Cunha, E
dc.contributor.authorRix, Hans-Walter
dc.contributor.authorvan der Wel, Arjen
dc.date.accessioned2018-11-29T22:56:37Z
dc.date.available2018-11-29T22:56:37Z
dc.identifier.issn2041-8205
dc.identifier.urihttp://hdl.handle.net/1885/153583
dc.description.abstractThe 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 the Hubble Space Telescope (HST) it is now possible to measure this beyond the local Universe. Here we present the spatial distribution of Hα emission for a sample of 54 strongly star-forming galaxies at z ~ 1 in the 3D-HST Treasury survey. By stacking the Hα emission, we find that star formation occurred in approximately exponential distributions at z ~ 1, with a median Sérsic index of n = 1.0 ± 0.2. The stacks are elongated with median axis ratios of b/a = 0.58 ± 0.09 in Hα 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 90-330 km s–1. 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(Hα) ~ 100 Å out to the solar orbit and they have star formation surface densities above the threshold for driving galactic scale winds.
dc.format.mimetypeapplication/pdf
dc.publisherInstitute of Physics Publishing Ltd.
dc.sourceAstrophysical Journal Letters
dc.titleTHE RADIAL DISTRIBUTION OF STAR FORMATION IN GALAXIES AT z similar to 1 FROM THE 3D-HST SURVEY
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume763
dc.date.issued2013
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationa383154xPUB8698
local.type.statusPublished Version
local.contributor.affiliationNelson, Erica June, Yale University
local.contributor.affiliationvan Dokkum, P.G., Yale University
local.contributor.affiliationMomcheva, Ivelina, Yale University
local.contributor.affiliationBrammer, Gabriel, European Southern Observatory
local.contributor.affiliationLundgren, Britt, University of Wisconsin-Madison
local.contributor.affiliationSkelton, Rosalind E, Yale University
local.contributor.affiliationWhitaker, Katherine, Yale University
local.contributor.affiliationda Cunha, Elisabete, College of Science, ANU
local.contributor.affiliationForster Schreiber, Natascha, Max-Planck-Institut f¨ur extraterrestrische Physik,
local.contributor.affiliationFranx, Marijn, Leiden University
local.contributor.affiliationNelson, Erica, Yale University
local.contributor.affiliationda Cunha, E, Max Planck Institute for Astronomy
local.contributor.affiliationRix, Hans-Walter, Max Planck Institute for Astronomy
local.contributor.affiliationvan der Wel, Arjen, Max-Planck-Institute fur Astronomie
local.bibliographicCitation.issue1
local.identifier.doi10.1088/2041-8205/763/1/L16
dc.date.updated2018-11-29T08:13:28Z
local.identifier.scopusID2-s2.0-84872312031
local.identifier.thomsonID000313564500016
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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