Molecular absorption lines toward the nucleus of Centaurus A

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

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..522e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. 522-531.

Astronomy and Astrophysics

Astronomy

31

Absorption Spectra, Elliptical Galaxies, Galactic Nuclei, Interstellar Matter, Molecular Clouds, Molecular Spectra, Radio Sources (Astronomy), X Ray Sources, Abundance, Carbon Monoxide, Cyanogen, Formyl Ions, Hydrocyanic Acid, Line Spectra, Molecular Absorption, Sulfides

Scientific paper

Measurements of absorption in the lines of (C-12)O, (C-13)O, HCO(+), HCN, CN, and CS toward the nuclear continuum source in Centaurus A are reported. The spectra show a number of features which can be attributed to individual molecular clouds with properties similar to dense molecular clouds in the Galaxy. The deepest absorption at the systemic velocity of Cen A originates in quiescent molecular clouds that are cold, dense, and clumped, and happen to lie along the line of sight to the central compact continuum source. A (C-12)O fractional abundance is obtained which is in excellent agreement with typical values derived for the dense ISM in the Galaxy. For the central absorption feature, the (C-12)O and (C-13)O J = 2-1 to J = 1-0 line ratio and the limit on this ratio for CN indicate that the absorption occurs in very cold and/or subthermlly excited gas.

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