Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264...55c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 1, p. 55-67.
Astronomy and Astrophysics
Astrophysics
70
Carbon Monoxide, Galactic Evolution, Interacting Galaxies, Abundance, Astronomical Spectroscopy, Galactic Nuclei, Luminosity, Molecular Gases, Nuclear Astrophysics
Scientific paper
A comparison of the (C-12)O and (C-13)O emissions of six systems of merging galaxies - NGC 828, NGC 3256, Arp 220, NGC 4194, Arp 299, and NGC 6240 - is presented. The observations were made in both the J = 1-0 and J = 2-1 transitions with the IRAM 30-m and SEST 15-m telescopes. The ((C-12)O data on NGC 828 and NGC 4194 are presented. In all galaxies but NGC 828, the (C-13)O emission is much weaker than in spirals. The average values of the emissivity ratios observed at the few-kiloparsec scale are 30 and 40 in the (1-0) and (2-1) transitions, respectively. These values are significantly larger than those usually observed in normal spiral galaxies, which are always between 5 and 15 for the J = 1-0 line. It is shown that this peculiar behavior cannot be interpreted as being due to the dominant presence of diffuse gas, and it cannot be attributed to optically thin CO emission either. The faint (C-13)O lines in mergers are thus likely due either to an underabundance of (C-13)O or to an overabundance of (C-12)O.
Casoli Fabienne
Combes François
Dupraz Christophe
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