H2 and H all-sky column density maps from HI4PI Gaussians

Argelander Institut für Astronomie - HEALPix nside=1024 data server, release 1 May 2020

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Data products:

HEALPix nside=1024 all-sky column density maps for the specified velocity range are generated from HI4PI Gaussian components based on EBHIS and GASS observations. Calculated are the distributions for CO-dark molecular hydrogen (H2), the total estimated CO-dark and CO-bright molecular hydrogen (H2tot), and the total atomic hydrogen (Htot). Only Gaussian components with center velocities vmin < vLSR < vmax are used. For a detailed explanation see the references below.

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Velocity properties
Velocity Range (vLSR) Constraint: (vmax-vmin) > 1 vmin [km/s]
vmax [km/s]

EBHIS is based on observations with the 100-m telescope of the MPIfR (Max-Planck-Institut für Radioastronomie) at Effelsberg. GASS was observed with the Parkes Radio Telescope as part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.


If you use data products from our server in your research or publications, please reference the following:

Kalberla, P. M. W., Kerp, J. and Haud, U. (2020) A&A in press, HI filaments are cold and associated with dark molecular gas, HI4PI based estimates of the local diffuse CO-dark H2

Haud, U. (2000) A&A, 364, 83 Gaussian decomposition of the Leiden/Dwingeloo survey. I. Decomposition algorithm


HI4PI Collaboration, N. Ben Bekhti, L. Flöer, et al. (2016) A&A, 594, A116 HI4PI: a full-sky H i survey based on EBHIS and GASS


B. Winkel, J. Kerp, L. Flöer, P. M. W. Kalberla, N. Ben Bekhti, R. Keller and D. Lenz, (2016) A&A 585, A41 The Effelsberg-Bonn H i Survey: Milky Way gas


Kalberla, P.M.W. and Haud, U. (2015) A&A 578, A78 (Highlight: Gass: The Parkes Galactic All-Sky Survey. III)

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