Earth Planets Space, Vol. 65 (No. 10), pp. 1095-1100, 2013
Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR7326, 13388, France
(Received October 25, 2012; Revised January 17, 2013; Accepted February 2, 2013; Online published October 24, 2013)
We want to study dust attenuation at ultraviolet (UV) wavelengths at high redshift, where the UV is redshifted to the observed visible light wavelength range. In particular, we search for a bump at 2175 Å.
We use photometric data in the Chandra Deep Field South (CDFS), obtained in intermediate
and broad band filters by the MUSYC project, to sample the UV rest-frame of 751 galaxies with 0.95
< z < 2.2. When available, infrared (IR) Herschel/PACS data from the GOODS-Herschel
project, coupled with Spitzer/MIPS measurements, are used to estimate the dust emission and to
constrain dust attenuation. The spectral energy distribution of each source is fit using the
CIGALE code. The average attenuation curve found for our sample galaxies
exhibits a UV bump whose amplitude is similar to that observed in the extinction curve of the LMC
super-shell region. The slope of the average attenuation curve at UV wavelength is found steeper
than that for local starburst galaxies. The amount of dust attenuation at UV wavelengths is found
to increase with stellar mass and to decrease as UV luminosity increases.
Key words: Galaxies: high-redshift, galaxies: ISM, ultraviolet:galaxies, dust: extinction.