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Pérez González, Pablo Guillermo and otros, ... (2016) Breaking the curve with candels: a Bayesian approach to reveal the non-universality of the dust-attenuation law at high redshift. Astrophysical journal, 827 (1). ISSN 0004-637X
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Official URL: http://dx.doi.org/10.3847/0004-637X/827/1/20
Abstract
Dust attenuation affects nearly all observational aspects of galaxy evolution, yet very little is known about the form of the dust-attenuation law in the distant universe. Here, we model the spectral energy distributions of galaxies at z ~ 1.5–3 from CANDELS with rest-frame UV to near-IR imaging under different assumptions about the dust law, and compare the amount of inferred attenuated light with the observed infrared (IR) luminosities. Some individual galaxies show strong Bayesian evidence in preference of one dust law over another, and this preference agrees with their observed location on the plane of infrared excess (IRX, L_TIR/L_UV) and UV slope (β). We generalize the shape of the dust law with an empirical model, A_ λ,σ =E(B-V)k_ λ (λ / λ v)^ σ where k_λ is the dust law of Calzetti et al., and show that there exists a correlation between the color excess E(B-V) and tilt δ with δ =(0.62±0.05)log(E(B-V))+(0.26±0.02). Galaxies with high color excess have a shallower, starburst-like law, and those with low color excess have a steeper, SMC-like law. Surprisingly, the galaxies in our sample show no correlation between the shape of the dust law and stellar mass, star formation rate, or β. The change in the dust law with color excess is consistent with a model where attenuation is caused by scattering, a mixed star–dust geometry, and/or trends with stellar population age, metallicity, and dust grain size. This rest-frame UV-to-near-IR method shows potential to constrain the dust law at even higher redshifts (z>3).
Item Type: | Article |
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Additional Information: | © 2016. The American Astronomical Society. |
Uncontrolled Keywords: | Star-forming galaxies; ~ 2; Spectral energy-distribution; Origins deep survey; Goods-south field; Stellar population synthesis; Extragalactic legacy survey; Luminous infrared galaxies; Active galactic nuclei; Small-magellanic-cloud |
Subjects: | Sciences > Physics > Astrophysics Sciences > Physics > Astronomy |
ID Code: | 39993 |
Deposited On: | 11 Nov 2016 15:27 |
Last Modified: | 10 Dec 2018 15:04 |
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