Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136...17o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 1, July 1984, p. 17-30.
Astronomy and Astrophysics
Astronomy
59
Carbon Monoxide, Galactic Structure, Interstellar Gas, Molecular Clouds, Radio Galaxies, Brightness Distribution, Emission Spectra, Galactic Nuclei, Galactic Rotation, Infrared Astronomy, Millimeter Waves, Optical Thickness, Radial Velocity
Scientific paper
The CO J = (1-0) emission of M82 is characterized on the basis of observations obtained with a cooled Schottky-barrier-diode mixer on the 20-m mm-wave telescope at Onsala Space Observatory during winter, 1983, with pointing accuracy 4 arcsec or better, full width at half power 33 arcsec, velocity resolution 2.6 km/s, and intensity accuracy within 20 percent. The data are presented in spectra, tables, and contour maps and discussed in detail. A sharp peak in the CO distribution found at the IR nucleus has half-power size 1.2 x 0.8 kpc and position angle 80 deg, and the mass within 500 pc is estimated at 60 million solar mass. The M82 molecular cloud is shown to comprise a large number of small hot low-mass clouds unlikely to support star formation. The system velocity is calculated as 220 + or - 10 km/s, and the rotation curve of the molecular-gas motion beyond a radius of about 1 kpc is described as highly asymmetric.
Olofsson Hans
Rydbeck Gustaf
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