Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...322..419w&link_type=abstract
Astronomy and Astrophysics, v.322, p.419-426
Astronomy and Astrophysics
Astrophysics
17
Galaxies: Individual: Ngc 5128, Galaxies: Nuclei, Galaxies: Ism, Radio Lines: Galaxies
Scientific paper
We present a fully sampled map of the ^13^CO J=1-0 emission in the dust lane of Centaurus A as well as ^13^CO 2-1 and for the first time C^18^O 1-0 spectra at selected positions. The morphology of the ^13^CO map is similar to the ^12^CO 1-0 and 2-1 maps. Maps of the ^12^CO 2-1/1-0 and ^12^CO/^13^CO 1-0 ratios show small variations of the ratios throughout the disk with a rise of the ^12^CO 2-1/1-0 ratio towards the southeast. The values found are within the range as found in other galaxies. Radiative transfer calculations indicate a kinetic temperature of 10-15K and H_2_ densities on the order of 3x10^4^cm^-3^. In the southeastern part of the dust lane, the gas appears to be warmer (20-30K) which may be due to a greater star formation activity. The total molecular mass is about 1.2 x 10^8^Msun_. The observed ^12^CO 2-1 intensity is consistent with the molecular gas being distributed in a thin, warped disk as modelled by Quillen et al. (1992ApJ...391..121Q). Comparison of the measurements with the kinematic model shows good agreement.
Eckart Andreas
Wiklind Thomas
Wild Walter
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