High-red-shift molecular clouds and absorption-line spectra of quasars

Details High-red-shift molecular clouds and absorption-line spectra of quasars High-red-shift molecular clouds and absorption-line spectra of quasars

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982comap...9..199v&link_type=abstract

Comments on Modern Physics, Part C - Comments on Astrophysics, vol. 9, Mar. 1982, p. 199-209.

Astronomy and Astrophysics

Astrophysics

7

Absorption Spectra, Interstellar Chemistry, Line Spectra, Molecular Clouds, Quasars, Red Shift, Carbon Monoxide, Chemical Composition, Chronology, Cosmology, Hydrogen, Ion Production Rates, Light (Visible Radiation), Milky Way Galaxy, Spectrum Analysis, Universe

Scientific paper

A successful search was conducted for molecular lines in the published absorption-line spectra of quasars. To increase the probability of the accidental coincidence of a galactic molecular cloud with the line of sight of a quasar, more distant quasars were investigated. At large cosmological distances corresponding to red shifts z = 2-3, molecular clouds were found containing H2 and CO. The parameters of these clouds, abundances, H2 and CO column densities, excitation temperature and ionization degree are similar to those of the interstellar clouds with N(H) greater than 10 to the 19th per sq cm in our galaxy. There seems to be no significant deviation of the chemical composition of the matter from the present composition. The high probability of finding these clouds at the line of sight may indicate that the gas component of a galaxy was larger at an early time.

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