Abstract
Molecular absorption in front of radio-loud quasars is a unique tool to probe cold gas at high redshifts, with the benefit of high angular and velocity resolutions. Up to 30 molecular lines have been detected in a single object, and 4 absorbing systems have been detected until now. Molecular abundances, and excitation temperatures can be studied at length in remote galaxies. The column densities sampled by this technique are between N (H2) = 1020 to 1024 cm-2; since the cross section for absorption is very small around a galaxy, the absorbing systems are either internal, or coming from a gravitational lens. The molecular measurements can then contribute to cosmographic studies.
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Combes, F., Wiklind, T. (1996). Absorption Measurements of Molecular Gas. In: Bremer, M.N., van der Werf, P.P., Röttgering, H.J.A., Carilli, C.L. (eds) Cold Gas at High Redshift. Astrophysics and Space Science Library, vol 206. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1726-2_22
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DOI: https://doi.org/10.1007/978-94-009-1726-2_22
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