Bulletin of the Astronomical Society of India
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Ganeshkhind, Pune 411007, India
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I describe results from Hi 21cm absorption studies of neutral hydrogen in the Galaxy and damped Lyman-α systems, and the implications for physical conditions in the interstellar medium of the Milky Way and high-z galaxies.
Keywords : quasars: absorption lines - galaxies: evolution - galaxies: ISM