HI Self - Absorption. Peculiar Puzzle and Potential Probe Predating the Arecibo Telescope Paul F. Goldsmith. The 21-cm Line of Atomic Hydrogen. Discovered in 1951 by Ewen and Purcell (2002 Gordon Lecture at Arecibo)
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Peculiar Puzzle and Potential Probe Predating
the Arecibo Telescope
Paul F. Goldsmith
Width of the HINSA features is so narrow that they must come from COLD (< 20K) gas!
Line minimum is so deep that in some cases the gas must again be below 20 K!