SIMBAD references

2018MNRAS.475.2363T - Mon. Not. R. Astron. Soc., 475, 2363-2374 (2018/April-1)

SHARDS: constraints on the dust attenuation law of star-forming galaxies at z ∼ 2.

TRESS M., MARMOL-QUERALTO E., FERRERAS I., PEREZ-GONZALEZ P.G., BARRO G., PAMPLIEGA B.A., CAVA A., DOMINGUEZ-SANCHEZ H., ELICHE-MORAL C., ESPINO-BRIONES N., ESQUEJ P., HERNAN-CABALLERO A., RODIGHIERO G. and RODRIGUEZ-MUNOZ L.

Abstract (from CDS):

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 medium-band 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 Δβ ∼ 0.4.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): dust, extinction - galaxies: high-redshift - galaxies: ISM - galaxies: stellar content

Simbad objects: 4

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2019.09.21-05:32:30

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