Mapping of a molecular complex in a northern spiral arm of M 31

Details Mapping of a molecular complex in a northern spiral arm of M 31 Mapping of a molecular complex in a northern spiral arm of M 31

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173...43c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 1, Feb. 1987, p. 43-48.

Astronomy and Astrophysics

Astrophysics

22

Andromeda Galaxy, Astronomical Maps, Carbon Monoxide, Molecular Clouds, Radio Spectra, Spiral Galaxies, Astronomical Spectroscopy, Galactic Structure, Line Spectra

Scientific paper

A restricted CO map at high resolution (22arcsec) has been obtained with the IRAM 30 m telescope towards a North-East spiral arm of M31. The authors have detected 12CO emission in 17 positions out of 41 observed. All the detected lines appear at the same LSR velocity, which implies that they come from a well-defined entity: a giant molecular complex. It has an H2 mass of about 1.3×106M_sun; and extends over roughly 160 pc. This complex is gravitationally bound; its structure is elongated and inhomogeneous on the 35 pc scale. The authors have also obtained a 13CO spectrum towards one point of the map, and confirmed an earlier determination of the ratio of 12CO to 13CO integrated emissivities around 10.

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