NH
Calculate the Total Galactic H I Column Density
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R.A. and Dec. can be entered in ddd.ddd/[s]dd.ddd or hh mm ss.s/[s]dd mm ss.s .
References: Kalberla et al. 2005, Astronomy & Astrophysics, 440, 775 (LAB Map).
Dickey & Lockman, 1990, ARAA, 28, 215 (DL Map).
nH is a Web version of the nH FTOOL, which was developed by Lorella Angelini at the HEASARC. The Web interface is maintained by Edward J. Sabol of the HEASARC.
Note: An alternative tool to calculate the neutral hydrogen column density out to a specified distance within our galaxy is available at the MAST web site. This tool was originally created and hosted by the now-closed Center for Extreme-Ultraviolet Astrophysics (CEA).
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