Pixel-by-pixel analysis of 90 clumps shows N2H+, HCO+, HCN and HNC abundances rise with falling H2 column density and rising temperature, with ratios varying systematically and 20 cm sources falling into four behavioral types.
& Henning, T.1994, A&A, 547, A49
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Spatial Variation of the Chemical Properties of Massive Star-forming Clumps
Pixel-by-pixel analysis of 90 clumps shows N2H+, HCO+, HCN and HNC abundances rise with falling H2 column density and rising temperature, with ratios varying systematically and 20 cm sources falling into four behavioral types.