Galactic Reddening in 3D from Stellar Photometry - An Improved Map
  We present a new 3D map of interstellar dust reddening, covering three
quarters of the sky (declinations greater than -30 degrees) out to a distance
of several kiloparsecs. The map is based on high-quality stellar photometry of
800 million stars from Pan-STARRS 1 and 2MASS. We divide the sky into
sightlines containing a few hundred stars each, and then infer stellar
distances and types, along with the line-of-sight dust distribution. Our new
map incorporates a more accurate average extinction law and an additional 1.5
years of Pan-STARRS 1 data, tracing dust to greater extinctions and at higher
angular resolutions than our previous map. Out of the plane of the Galaxy, our
map agrees well with 2D reddening maps derived from far-infrared dust emission.
After accounting for a 15% difference in scale, we find a mean scatter of 10%
between our map and the Planck far-infrared emission-based dust map, out to a
depth of 0.8 mag in E(r-z), with the level of agreement varying over the sky.
Our map can be downloaded at http://argonaut.skymaps.info, or by its DOI:
10.7910/DVN/LCYHJG.
