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CO in M82 and Other Mildly Active Galaxies

Published online by Cambridge University Press:  14 August 2015

R. Wielebinski
R. Wielebinski*
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-5300 Bonn 1, West Germany

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A large project of studying various transitions and isotopie species of CO in M82 has been carried out with the 30-m IRAM radio telescope. A 1.′6×1.′0 area was mapped in 12CO(2→1) with 13″ resolution (Loiseau et al., 1988a). The purpose of these observations was to obtain high signal-to-noise, high resolution data for comparison with the 12CO(1→0) observations of Nakai et al. (1987). A 13CO(2→1) observation covered the central 110×017 region (Loiseau et al., 1988b) and allowed to establish the velocity field of CO in the inner nuclear region. The position angle of the rotation axis of 13CO is aligned with the optical rotation and at some 30° relative to the 12CO velocity field. The 13CO map also shows the existence of clumped emission in the central region. All data show the rotating molecular ring. At some selected points (nucleus, major axis) 12CO/13CO ratios in both the (1→0) and (2-H) transition have been determined. The earlier suggestion that optical depth plays an important role in M82 has been confirmed. Variations of optical depth have been determined in the sources that there are several extended (>100pc) molecular complexes.

Type
Joint Commission Meeting
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 595 - 596
Copyright
Copyright © Kluwer 1989

References

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