CO observations of M31 with 100 PC resolution

Details CO observations of M31 with 100 PC resolution CO observations of M31 with 100 PC resolution

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140l...5b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

17

Andromeda Galaxy, Carbon Monoxide, Molecular Clouds, Spiral Galaxies, Emission Spectra, Hydrogen Clouds, Molecular Spectra, Spatial Distribution

Scientific paper

Results of CO observations with the Onsala 20m telescope towards one spiral arm of the Andromeda galaxy are presented. Comparison with lower resolution data reveals a high degree of inhomogeneity of the molecular emission on the 100 pc scale. Inside the spiral arm two components are observed: CO complexes giving narrow bright lines and a diffuse component showing up when adjacent spectra are averaged. This diffuse emission, very broad in velocity, can be interpreted as coming from a lot of small clouds. The narrow bright emission is just resolved by the beam and corresponds to giant molecular complexes of at least 100 pc in size and of total mass that is approximately one million solar masses. These complexes are located at the center of the spiral arm, are associated with maxima of HI emission and are gravitationally bound.

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