Journal Article

Dust attenuation in the rest-frame ultraviolet: constraints from star-forming galaxies at <i>z</i> ∼ 1

Charlie Conroy

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 404, issue 1, pages 247-252
Published in print May 2010 | ISSN: 0035-8711
Published online April 2010 | e-ISSN: 1365-2966 | DOI:
Dust attenuation in the rest-frame ultraviolet: constraints from star-forming galaxies at z ∼ 1

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A novel technique is employed for estimating attenuation curves in galaxies where only photometry and spectroscopic redshifts are available. This technique provides a powerful measure of particular extinction features such as the UV bump at 2175 Å, which has been observed in environments ranging from the Milky Way to high-redshift star-forming galaxies. Knowledge of the typical strength of the UV bump as a function of environment and redshift is crucial for converting rest-frame UV flux into star formation rates. The UV bump will impart a unique signature as it moves through various filters due to redshifting; its presence can therefore be disentangled from other stellar population effects. The utility of this technique is demonstrated with a large sample of galaxies drawn from the DEEP2 Galaxy Redshift Survey. The observed BR colour of star-forming galaxies at 0.6 < z < 1.4 disfavours the presence of a UV bump as strong as observed in the Milky Way, and instead favours rest-frame UV (1800 Å < λ < 3000 Å) attenuation curves similar to the Milky Way without a UV bump, a power law with index δ=−0.7, or a form advocated by Calzetti and collaborators. Stronger constraints on the strength of the UV bump in galaxies can be achieved if independent constraints on the V-band optical depth are available.

Keywords: galaxies: evolution; galaxies: general; galaxies: ISM

Journal Article.  4721 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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