Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56..431o&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.56, No.3, pp. 431-438
Astronomy and Astrophysics
Astronomy
4
Galaxies: Individual (Ngc 253, M 82), Galaxies: Starburst, Ism: Molecules, Molecular Processes, Radio Lines: Galaxies
Scientific paper
Several transitions of the cyclopropenylidene (cyclic-C3H2) molecule have been observed in the 83-218GHz region toward NGC 253 and M 82. Assuming local thermodynamic equilibrium, the rotational temperatures were determined to be 10.8 ± 2.4 K and 11.5 ± 3.0 K for NGC 253 and M 82, respectively, where the errors indicate three standard deviations (3 σ). The column densities of cyclic-C3H2 were determined to be N(NGC 253) = (2.7 ± 1.1) × 1013 cm-2. and N(M 82) = (1.9 ± 0.9) × 1013 cm-2. Large velocity gradient calculations were applied to estimate kinetic temperatures of around 60K for NGC 253 and M 82. Considering the present result and recent observations of NH3 in both galaxies, molecular production mechanisms are discussed.
Kawaguchi Kentarou
Nakai Naomasa
Oike Tomoko
Takano Shuro
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