Titlebook: Galactic and Extragalactic Radio Astronomy; Gerrit L. Verschuur,Kenneth I. Kellermann Textbook 1988Latest edition Springer-Verlag New York

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Molecules as Probes of the Interstellar Medium and of Star Formation,was restricted to use of the 21-cm line of HI and to optical absorption lines of several atoms (Na, Ca, Fe, K, Ti) toward nearby hot stars. To avoid excessive extinction, the optical techniques were limited both to distances of < 1 kpc from the Sun and to diffuse clouds (visual extinction < 2 magn).

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Astronomical Masers,iding a fascinating astrophysical laboratory for the study of maser processes, the intense emissions have been used as probes of the dynamics and physical conditions of their surroundings on scales as small as one astronomical unit throughout the Galaxy and in nearby galaxies. Since masers are found

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The Structure of Our Galaxy Derived from Observations of Neutral Hydrogen,rticularly suitable. Neutral atomic hydrogen, HI, is the main observed constituent of the interstellar medium; its physical properties are closely related to the properties of other Galactic constituents, both stellar and interstellar. The interstellar medium is transparent enough to hydrogen emissi

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