Clark & Hensley 3D HI-based Stokes Parameter Maps

HI-based Stokes parameter maps described in "Mapping the Magnetic Interstellar Medium in Three Dimensions over the Full Sky with Neutral Hydrogen," Clark & Hensley 2019, ApJ 887, 136. Use of these data must cite that paper. There are two sets of maps, one based on the 4' GALFA-HI data, and one based on the 16.2' HI4PI data. Details of the underlying HI data can be found in the respective publications for these surveys: GALFA-HI: Peek et al. 2018, ApJS 234, 2 HI4PI: Ben Bekhti et al. 2016, A&A 594, 116 Units are K km/s, as described in Clark & Hensley 2019. These maps are at full resolution, and there are pixels in the Q(v) and U(v) cubes with no data -- see Section 3.2 in Clark & Hensley. These are set to nan (python value None). The polarization convention is Galactic IAU, with the sense of polarization perpendicular to HI filaments on the plane of the sky. To obtain maps corresponding to polarized dust emission in the COSMO convention, multiply U by -1. To obtain maps corresponding to the magnetic field orientation in the IAU convention, multiply both Q and U by -1. Please see github.com/seclark/ClarkHensley2019 for code that demonstrates the use of these data.