Predicting Resolved Dust Attenuation from Local Galaxy Properties Using MaNGA

TL;DR

This paper develops an empirical model to predict spatially resolved dust attenuation in star-forming galaxies using MaNGA data, enabling more accurate dust corrections and insights into galaxy structure.

Contribution

The study introduces a novel, scalable model for predicting dust attenuation from local galaxy properties, validated across diverse galaxy types and orientations.

Findings

Model achieves R^2 = 0.69 and RMSE = 0.22 mag in predicting A_V.

Iterative application recovers dust-corrected SFR surface density with minimal bias.

Accurately reproduces radial A_V profiles and their dependence on galaxy mass and activity.

Abstract

Accurate spatially resolved dust corrections are critical for interpreting the structure and evolution of star-forming galaxies (SFGs). We present an empirical model for predicting spatially resolved dust attenuation ($A_V$) in SFGs using integral field spectroscopy from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. Using a sample of 5,155 galaxies over $7.20<M_\ast<11.14$ and $0.0002 < z < 0.1444$, we derive $A_V$ maps from the Balmer decrement across more than 1,898,954 star-forming spaxels. Using local star formation rate surface density ($\Sigma_{\text{SFR}}$) as a predictor, the model achieves $R^2 = 0.69$ and RMSE $=0.22$ mag, with residuals that are approximately Gaussian and centred near zero. It predicts $A_V$ within a factor of $\sim$1.3 on kpc scales. We also demonstrate that the relation can be applied iteratively to recover dust-corrected $\Sigma_{\mathrm{SFR}}$ from uncorrected values, converging by the fourth iteration with minimal residual bias ($-0.01$ mag) and low RMSE ($0.42$ mag). The model accurately reproduces $A_V$ maps across diverse morphologies and orientations, including edge-on systems. It also recovers the observed radial $A_V$ profiles, capturing their dependence on stellar mass and relative star formation activity, with more massive and more strongly star-forming galaxies showing steeper gradients.