Galactic maps of HI, reconstructed from the HI4PI 21-cm line survey

Maps of galactic HI, reconstructed from the HI4PI 21-cm line survey data (HI4PI Collaboration 2016, A&amp;A 594, A116), Strasbourg astronomical Data Center, using a Bayesian variational inference approach. Here, we provide the mean and standard deviation of the gas density (in cm^-3) on a three-dimensional 768\(\times\)768\(\times\)64 grid, spanning -24 kpc &lt; x &lt; 24 kpc, -24 kpc &lt; y &lt; 24 kpc and -2 kpc &lt; z &lt; 2 kpc, both for the BEG03 and the SBM15 gas flow models: HI_dens_mean_BEG03.fits HI_dens_stddev_BEG03.fits HI_dens_mean_SBM15.fits HI_dens_stddev_SBM15.fits In addition, we also publish the mean and standard deviation of the mass surface density (in M_sun pc^-2) on a two-dimensional 768\(\times\)768 grid, spanning -24 kpc &lt; x &lt; 24 kpc and -24 kpc &lt; y &lt; 24 kpc, again for both gas flow models: HI_surf_mass_dens_mean_BEG03.fits HI_surf_mass_dens_stddev_BEG03.fits HI_surf_mass_dens_mean_SBM15.fits HI_surf_mass_dens_stddev_SBM15.fits Throughout, we have assumed the optically thin limit for the gas and adopted the conversion factor \(X_{{\rm HI}}\simeq 1.823\times 10^{18}\) molecules cm^-2 (K km s^-1)^-1. Refer to the FITS headers for more detailed information and see arXiv:2202.02341 for a detailed description of the reconstruction as well as a comparison with earlier studies. When using the deprojected gas maps in your research work, please refer to this Zenodo dataset and the following publication<br> P. Mertsch and V.H.M. Phan, "Bayesian inference of three-dimensional gas maps: II. Galactic HI", arXiv:2202.02341.