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arXiv · 1006.2336

The Wyoming Survey for H-alpha. III. A Multi-wavelength Look at Attenuation by Dust in Galaxies out to z~0.4

Carolynn A. Moore·Daniel A. Dale·Rebecca J. Barlow·Seth A. Cohen·David O. Cook·L. C. Johnson·ShiAnne M. Kattner·Janice C. Lee·Shawn M. Staudaher
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Abstract

We report results from the Wyoming Survey for H-alpha (WySH), a comprehensive four-square degree survey to probe the evolution of star-forming galaxies over the latter half of the age of the Universe. We have supplemented the H-alpha data from WySH with infrared data from the Spitzer Wide-area Infrared Extragalactic (SWIRE) Survey and ultraviolet data from the Galaxy Evolution Explorer (GALEX) Deep Imaging Survey. This dataset provides a multi-wavelength look at the evolution of the attenuation by dust, and here we compare a traditional measure of dust attenuation (L(TIR)/L(FUV)) to a diagnostic based on a recently-developed robust star formation rate (SFR) indicator, [H-alpha_obs+24-micron]/H-alpha_obs. With such data over multiple epochs, the evolution in the attenuation by dust with redshift can be assessed. We present results from the ELAIS-N1 and Lockman Hole regions at z~0.16, 0.24, 0.32 and 0.40. While the ensemble averages of both diagnostics are relatively constant from epoch to epoch, each epoch individually exhibits a larger attenuation by dust for higher star formation rates. Hence, an epoch to epoch comparison at a fixed star formation rate suggests a mild decrease in dust attenuation with redshift.

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Carolynn A. Moore, Daniel A. Dale, Rebecca J. Barlow, Seth A. Cohen, David O. Cook, L. C. Johnson, ShiAnne M. Kattner, Janice C. Lee, Shawn M. Staudaher. 2010-06-11. The Wyoming Survey for H-alpha. III. A Multi-wavelength Look at Attenuation by Dust in Galaxies out to z~0.4. https://doi.org/10.1088/0004-6256%2F140%2F1%2F253

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