The Rest-frame Ultraviolet Structure of 0.5 < z < 1.5 Galaxies
Abstract
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.
Additional Information
© 2014 The American Astronomical Society. Received 2013 November 25; Accepted 2014 March 26; Published 2014 July 22. Support for program number HST-GO-12534 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.Attached Files
Published - 0004-637X_791_1_18.pdf
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Additional details
- Eprint ID
- 49072
- Resolver ID
- CaltechAUTHORS:20140829-123212997
- NAS5-26555
- NASA
- Created
-
2014-08-29Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)