Tress, M;
Marmol-Queralto, E;
Ferreras, I;
Perez-Gonzalez, PG;
Barro, G;
Alcalde Pampliega, B;
Cava, A;
... Rodriguez-Munoz, L; + view all
(2018)
SHARDS: constraints on the dust attenuation law of star-forming
galaxies at z ∼ 2.
Monthly Notices of the Royal Astronomical Society
, 475
(2)
pp. 2363-2374.
10.1093/mnras/stx3334.
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Abstract
We make use of the Survey of High-z Absorption Red and Dead Sources, an ultradeep (<26.5AB) galaxy survey that provides optical photospectra at resolution R ∼ 50, via mediumband filters (FWHM ∼ 150 Å). This data set is combined with ancillary optical and NIR fluxes to constrain the dust attenuation law in the rest-frame NUV region of star-forming galaxies within the redshift window 1.5 < z < 3. We focus on the NUV bump strength (B) and the total-to-selective extinction ratio (RV), targeting a sample of 1753 galaxies. By comparing the data with a set of population synthesis models coupled to a parametric dust attenuation law, we constrain RV and B, as well as the colour excess, E(B − V). We find a correlation between RV and B, which can be interpreted either as a result of the grain size distribution, or a variation of the dust geometry among galaxies. According to the former, small dust grains are associated with a stronger NUV bump. The latter would lead to a range of clumpiness in the distribution of dust within the interstellar medium of star-forming galaxies. The observed wide range of NUV bump strengths can lead to a systematic in the interpretation of the UV slope β typically used to characterize the dust content. In this study, we quantify these variations, concluding that the effects are β ∼ 0.4.
| Type: | Article |
|---|---|
| Title: | SHARDS: constraints on the dust attenuation law of star-forming galaxies at z ∼ 2 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx3334 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stx3334 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript/version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Dust, extinction, galaxies: high-redshift, galaxies: ISM, galaxies: stellar content, INITIAL MASS FUNCTION, INTERSTELLAR EXTINCTION, FORMATION HISTORIES, STARBURST GALAXIES, ULTRAVIOLET, STELLAR, SPITZER, CATALOGS, OPACITY, M82 |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10046288 |
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