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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
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
Astrophysical Journal Letters, Volume 747, No. 2, Article L28, Year 2012
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Description
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 ± 0.1kpc but the sizes span a large range, from compact objects with re (Hα) 1.0kpc to extended disks with re (Hα) 15kpc. Comparing Hα sizes to continuum sizes, we find
=1.3 ± 0.1 for the full sample. That is, star formation, as traced by Hα, typically occurs out to larger radii than the rest-frame R-band stellar continuum; galaxies are growing their radii and building up from the inside out. This effect appears to be somewhat more pronounced for the largest galaxies. Using the measured Hα sizes, we derive star formation rate surface densities, ΣSFR. We find that ΣSFR ranges from 0.05 M yr-1kpc-2 for the largest galaxies to 5 M yr-1kpc-2 for the smallest galaxies, implying a large range in physical conditions in rapidly star-forming z 1 galaxies. Finally, we infer that all galaxies in the sample have very high gas mass fractions and stellar mass doubling times <500Myr. Although other explanations are also possible, a straightforward interpretation is that we are simultaneously witnessing the rapid formation of compact bulges and large disks at z 1. © 2012. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Nelson, Erica June
United States, New Haven
Yale University
Van Dokkum, Pieter G.
United States, New Haven
Yale University
Brammer, Gabriel B.
Chile, Santiago
European Southern Observatory Santiago
Förster-Schreiber, Natascha M.F.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Franx, Marijn
Netherlands, Leiden
Universiteit Leiden
Fumagalli, Mattia
Netherlands, Leiden
Universiteit Leiden
Patel, Shannon G.
Netherlands, Leiden
Universiteit Leiden
Rix, Hans Walter R.
Germany, Heidelberg
Max Planck Institute for Astronomy
Skelton, Rosalind E.
United States, New Haven
Yale University
Bezanson, Rachel S.
United States, New Haven
Yale University
da Cunha, Elisabete
Germany, Heidelberg
Max Planck Institute for Astronomy
Kriek, Mariska T.
United States, Berkeley
University of California, Berkeley
Labbé, Ivo
Netherlands, Leiden
Universiteit Leiden
Lundgren, Britt Fisher
United States, New Haven
Yale University
Quadri, Ryan F.
United States, Pasadena
Carnegie Observatories
Schmidt, Kasper Borello
Germany, Heidelberg
Max Planck Institute for Astronomy
Statistics
Citations: 103
Authors: 16
Affiliations: 7
Identifiers
Doi:
10.1088/2041-8205/747/2/L28
ISSN:
20418213
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative