Cold molecular gas and history of the Universe.

Details Cold molecular gas and history of the Universe. Cold molecular gas and history of the Universe.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997crasb.325..297c&link_type=abstract

Comptes Rendus de l'Academie des Sciences, Sér. II, Fasc. b, Tome 325, No. 5, p. 297 - 306

Mathematics

Logic

Molecular Abundances: Quasars, Cosmic Microwave Background: Temperatures

Scientific paper

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. Molecular abundances, and excitation temperatures can be studied at length in remote galaxies. The diffuse components allow to obtain an upper limit on the temperature of the cosmic background radiation as a function of redshift. 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 cosmological determination.

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