The First 3$\pi$ 3D Map of ISM Dust Temperature

Understand

We present the first large-scale 3D map of interstellar dust temperature.

• We build upon existing 3D reddening maps derived from starlight absorption (Bayestar19), covering 3/4 of the sky.
• Starting with the column density for each of 500 million 3D voxels, we propose a temperature and emissivity power-law slope ($\beta$) for each of them, and integrate along the line of sight to synthesize an emission map in five frequency bands observed by \emph{Planck} and \emph{IRAS}.
• The reconstructed emission map is constrained to match observations on a $10'$ scale, and does so with good fidelity.