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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A candels-3D-hst synergy: Resolved star formation patterns at 0.7 < z < 1.5
Astrophysical Journal, Volume 779, No. 2, Article 135, Year 2013
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Description
We analyze the resolved stellar populations of 473 massive star-forming galaxies at 0.7 < z < 1.5, with multi-wavelength broadband imaging from CANDELS and Hα surface brightness profiles at the same kiloparsec resolution from 3D-HST. Together, this unique data set sheds light on how the assembled stellar mass is distributed within galaxies, and where new stars are being formed. We find the Hα morphologies to resemble more closely those observed in the ACS I band than in the WFC3 H band, especially for the larger systems. We next derive a novel prescription for Hα dust corrections, which accounts for extra extinction toward H II regions. The prescription leads to consistent star formation rate (SFR) estimates and reproduces the observed relation between the Hα/UV luminosity ratio and visual extinction, on both a pixel-by-pixel and a galaxy-integrated level. We find the surface density of star formation to correlate with the surface density of assembled stellar mass for spatially resolved regions within galaxies, akin to the so-called "main sequence of star formation" established on a galaxy-integrated level. Deviations from this relation toward lower equivalent widths are found in the inner regions of galaxies. Clumps and spiral features, on the other hand, are associated with enhanced Hα equivalent widths, bluer colors, and higher specific SFRs compared to the underlying disk. Their Hα/UV luminosity ratio is lower than that of the underlying disk, suggesting that the ACS clump selection preferentially picks up those regions of elevated star formation activity that are the least obscured by dust. Our analysis emphasizes that monochromatic studies of galaxy structure can be severely limited by mass-to-light ratio variations due to dust and spatially inhomogeneous star formation histories. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Wuyts, Stijn
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Förster-Schreiber, Natascha M.F.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
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
Chang, Yu Yen
Germany, Heidelberg
Max Planck Institute for Astronomy
Faber, Sandra M.
United States, Mount Hamilton
Lick Observatory
Ferguson, Henry C.
United States, Baltimore
Space Telescope Science Institute
Franx, Marijn
Netherlands, Leiden
Sterrewacht Leiden
Fumagalli, Mattia
Netherlands, Leiden
Sterrewacht Leiden
Genzel, Reinhardt
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Grogin, Norman A.
United States, Baltimore
Space Telescope Science Institute
Kocevski, Dale D.
United States, Lexington
University of Kentucky
Koekemoer, Anton M.
United States, Baltimore
Space Telescope Science Institute
Lundgren, Britt Fisher
United States, Madison
University of Wisconsin-madison
Lutz, Dieter
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
McGrath, Elizabeth J.
United States, Waterville
Colby College
Momcheva, Ivelina G.
United States, New Haven
Yale University
Rosario, David J.V.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Skelton, Rosalind E.
South Africa, Cape Town
South African Astronomical Observatory
Tacconi, Linda J.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
van der Wel, Arjen
Germany, Heidelberg
Max Planck Institute for Astronomy
Whitaker, Katherine E.
United States, Greenbelt
Nasa Goddard Space Flight Center
Statistics
Citations: 169
Authors: 23
Affiliations: 12
Identifiers
Doi:
10.1088/0004-637X/779/2/135
ISSN:
0004637X
e-ISSN:
15384357