THE OUTER DISK OF THE MILKY WAY SEEN IN λ21 cm ABSORPTION
THE OUTER DISK OF THE MILKY WAY SEEN IN λ21 cm ABSORPTION
Three recent surveys of 21-cm line emission in the Galactic plane, combining single dish and interferometer observations to achieve resolution of 1 arcmin to 2 arcmin, 1 km/s, and good brightness sensitivity, have provided some 650 absorption spectra with corresponding emission spectra for study of the distribution of warm and …