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Published online by Cambridge University Press: 14 August 2015
There has been a great development in the past few years of observational data of various kinds:
(a) HI observations of high resolution and sensitivity (Cohen and Davies, Burton et al., Kerr et al.)
(b) Observations of molecules, in particular high-resolution observations of CO (Burton, Gordon, Bania, Liszt, Solomon et al.)
(c) Infrared and far-infrared
(d) Ionized gas: hydrogen recombination lines, and in particular Nell (with 4″ beam) (Mezger et al., Townes, Wollman et al.)