CO J = 1-0, 2-1 and 3-2 absorption and emission toward the nucleus of Centaurus A(asterisk) - Probing the circumnuclear disk

Details CO J = 1-0, 2-1 and 3-2 absorption and emission toward the nucleus of Centaurus A(asterisk) - Probing the circumnuclear disk CO J = 1-0, 2-1 and 3-2 absorption and emission toward the nucleus of Centaurus A(asterisk) - Probing the circumnuclear disk

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245l..13i&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 1, May 1991, p. L13-L16.

Astronomy and Astrophysics

Astrophysics

41

Absorption Spectra, Astronomical Spectroscopy, Carbon Monoxide, Galactic Nuclei, Molecular Spectra, Spectral Emission, Emission Spectra, Formyl Ions, Infrared Radiation, Quantum Numbers, Red Shift, Rotational Spectra, Signal To Noise Ratios

Scientific paper

High SNR of (C-12)O, (C-13)O and (C-18)O J = 1-0, (C-12)O 2-1 and (C-12)O 3-2 have been obtained toward the nucleus of Centaurus A. The (C-12)O profiles reveal the presence of two superposed emission components. The narrower component is due to CO emission from the dust lane. The broader component represents CO emission from the circumnuclear disk, whose presence was previously deduced from absorption line and infrared continuum observations. Analysis of the CO data suggests excitation temperatures of about 25 K in the circumnuclear disk. In both HCO(+) and CO spectra, weak absorption features are seen at red-shifted velocities, which probably represent warm and dense gas falling into the nucleus.

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