Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...200l...1l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 200, no. 1-2, July 1988, p. L1-L4.
Astronomy and Astrophysics
Astrophysics
50
Carbon Monoxide, Carbon 13, Interstellar Gas, Starburst Galaxies, X Ray Sources, Carbon Isotopes, Emission Spectra, H I Regions, Line Spectra, Supernova Remnants
Scientific paper
The C-13O(2-1) transition in M82 was mapped. This is the first map of the C-13O isotope of any external galaxy and covers the central 1.0 x 0.7 arcmin region of M82. The beamwidth was 13 arcsec and the field was covered in 6 arcsec steps. The C-13O(2-1) distribution in M82 is quite different from that of C-12O both in the (1-0) and (2-1) transitions. The strongest C-13O(2-1) emission is seen in the center of M82, superposed on the torus 'ring' structure known from the C-12O(1-0) and (2-1) maps. This C-13O(2-1) maximum seems to coincide with the maximum of the SNR distribution and X-ray emission, a secondary maximum in the HI line absorption and with the peak of the radio recombination line emission. Two other prominent C-13O features are found which lack any C-12O counterpart. These differences are interpreted as mainly due to variations in optical depth. The velocity field of the C-13O(2-1) emission shows, in contrast to previous kinematical studies, the rotation axis to be aligned with the optical minor axis. This can be ascribed to the optically thin nature of the C-13O emission.
Klein Ulf
Loiseau Nora
Reuter H.-P.
Wielebinski Richard
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