The rest-frame ultraviolet structure of 0.5 < z < 1.5 galaxies

Nicholas A. Bond, Jonathan P. Gardner, Duilia F. De Mello, Harry I. Teplitz, Marc Rafelski, Anton M. Koekemoer, Dan Coe, Norman Grogin, Eric Gawiser, Swara Ravindranath, Claudia Scarlata

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9 Scopus citations


We present the rest-frame UV wavelength dependence of the Petrosian-like half-light radius (r 50), and the concentration parameter for a sample of 198 star-forming galaxies at 0.5 < z < 1.5. We find a ∼5% decrease in r 50 from 1500 Å to 3000 Å, with half-light radii at 3000 Å ranging from 0.6 kpc to 6 kpc. We also find a decrease in concentration of ∼0.07 (1.9 < C 3000 < 3.9). The lack of a strong relationship between r 50 and wavelength is consistent with a model in which clumpy star formation is distributed over length scales comparable to the galaxy's rest-frame optical light. While the wavelength dependence of r 50 is independent of size at all redshifts, concentration decreases more sharply in the far-UV (∼1500 Å) for large galaxies at z ∼ 1. This decrease in concentration is caused by a flattening of the inner ∼20% of the light profile in disk-like galaxies, indicating that the central regions have different UV colors than the rest of the galaxy. We interpret this as a bulge component with older stellar populations and/or more dust. The size-dependent decrease in concentration is less dramatic at z ∼ 2, suggesting that bulges are less dusty, younger, and/or less massive than the rest of the galaxy at higher redshifts.

Original languageEnglish (US)
Article number18
JournalAstrophysical Journal
Issue number1
StatePublished - Aug 10 2014


  • cosmology
  • formation - galaxies
  • high-redshift - galaxies
  • observations - galaxies
  • structure


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