Molecules at high redshift. V - Improved limits on the column density of CO in two damped Lyman alpha absorption systems

Details Molecules at high redshift. V - Improved limits on the column density of CO in two damped Lyman alpha absorption systems Molecules at high redshift. V - Improved limits on the column density of CO in two damped Lyman alpha absorption systems

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.2052l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Dec. 1989, p. 2052-2055.

Astronomy and Astrophysics

Astronomy

9

Absorption Spectra, Carbon Monoxide, Lyman Alpha Radiation, Quasars, Red Shift, Hydrogen, Interstellar Matter, Molecular Clouds, Spectral Line Width

Scientific paper

Improved limits are presented on the ratio of the column density of carbon monoxide to that of neutral hydrogen in the high neutral hydrogen column density damped Lyman alpha absorption systems toward the QSOs PHL 957 and MC 1131 + 170. The ratio is more than two orders of magnitude lower than that found in diffuse clouds in the interstellar medium of the Galaxy.

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