Halal et al. 2023 3D HI-based Stokes Parameter Maps

The HI-based Stokes parameter maps used in "Filamentary Dust Polarization and the Morphology of HI Structures," Halal et al. 2023. Use of these data must cite that paper and Clark & Hensley 2019. There are four sets of data cubes: one at Nside=1024 based on the 4' GALFA-HI data computed using the Spherical RHT algorithm, one at Nside=2048 based on the 4' GALFA-HI data smoothed to 7' computed using the Hessian algorithm, and two at Nside=1024 based on the 16.2' HI4PI data (one computed using the Spherical RHT algorithm and the other using the Hessian algorithm). A map based on the Hessian algorithm and the 16.2' HI4PI data, integrated over the velocity range -13 km/s to 16 km/s (Section 4.1 in Halal et al. 2023), is also available. The provided data cubes can be used to produce integrated maps over any velocity range desired. These maps are given in units of K km/s and follow the Galactic IAU polarization convention. Multiply U by -1 to obtain maps corresponding to the COSMO convention as those provided by Planck. Multiply both Q and U by -1 to obtain maps corresponding to the magnetic field orientation in the IAU convention. Please see this repository for code that demonstrates the use of data of the same format. The velocity binning of this data follows that of Clark & Hensley 2019 and can be found here.