Fade to grey: systematic variation of the galaxy attenuation curves with galaxy properties in EAGLE

TL;DR

This paper introduces a simple, scalable model for galaxy attenuation that captures the variation with galaxy properties and reproduces observed attenuation relations in cosmological simulations.

Contribution

The authors develop a dust attenuation model based on the Charlot & Fall (2000) framework, calibrated with EAGLE simulation data, and demonstrate its ability to reproduce observed attenuation trends.

Findings

Attenuation parameters correlate tightly with dust surface density.

Relations are nearly independent of redshift in the EAGLE simulation.

The model accurately reproduces observed attenuation slopes and optical depths.

Abstract

We present a simple model for galaxy attenuation by distilling SKIRT radiative transfer calculations for ~100,000 EAGLE galaxies at redshifts z=2-0. Our model adapts the two component screen model of Charlot & Fall (2000), parametrising the optical depth and slope of the ISM screen using the average dust surface density, $\Sigma_{\rm dust}$. We recover relatively tight relations between these parameters for the EAGLE sample, but also provide the scatter in these parameter owing to the morphological variation and orientation of galaxies. We also find that these relations are nearly independent of redshift in the EAGLE model. By pairing our model with an empirical prescription for birth clouds below the resolution scale of the simulation, we reproduce the observed relation between attenuation slope and optical depth for the first time in a cosmological simulation. We demonstrate that this result is remarkably independent of the attenuation properties assumed for birth cloud screen, merely requiring a boosted attenuation for infant stars. We present this model with a view to interpreting observations, as well as processing semi-analytic models and other hydrodynamic simulations.