Molecular absorption lines towards the nucleus of Centaurus A

Details Molecular absorption lines towards the nucleus of Centaurus A Molecular absorption lines towards the nucleus of Centaurus A

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9116976e&link_type=abstract

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Absorption Spectra, Active Galactic Nuclei, Centaurus Constellation, Interstellar Matter, Celestial Bodies, Galaxies, Molecular Clouds, Stars

Scientific paper

The properties of the molecular interstellar medium in Centaurus A are examined through analysis of molecular absorption lines obtained using the Swedish ESO Submillimeter Telescope (SEST). The results indicate that: the absorption takes place against the compact nuclear continuum source in the line emitting clouds all along the line of sight through the molecular disk of Centaurus A; that the bulk of the absorbing gas is cold; that some absorptions at the systematic velocity of Centaurus A are comparable to typical values found for dense galactic clouds; that abundances, excitation temperature, and density of the absorbing and emitting molecular gas in the disk of Centaurus A are similar to the values obtained for the disk material in other galaxies; and that the absorbing molecular clouds are clumped. The fact that the absorbing molecular gas is cold and dense is in agreement with the finding that at the mean distance of the absorbing gas of 1 kpc radiative excitation from the nuclear source is not important. The molecular abundances found in Centaurus A are within the same range of values obtained for other well studied galaxies.

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