First detection of molecular gas near the center of M 81

Details First detection of molecular gas near the center of M 81 First detection of molecular gas near the center of M 81

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242..371s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 2, Feb. 1991, p. 371-375. Research supported by Kahlmeyer Foundation.

Astronomy and Astrophysics

Astrophysics

23

Galactic Nuclei, Molecular Gases, Spiral Galaxies, Astronomical Spectroscopy, Carbon Monoxide, Emission Spectra, Galactic Rotation

Scientific paper

(C-12)O J = 1 - 0 observations of 7 positions located in the inner 3 arcminutes of M 81 are presented. CO emission was detected at all positions. The peak intensities are less than those previously observed in the outer disk, but the integrated intensity of the center position is a factor of 2.5 stronger than at any position in the outer disk. The mass of molecular gas implied by the CO observations is a very small fraction (about 0.0017) of the dynamical mass within the same region. The CO line velocities are compared to optical and HI velocities and are found to agree well.

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