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Detection of CO in the inner part of M31's bulge

A. -L. Melchior·F. Viallefond·M. Guelin·N. Neininger
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Abstract

We report the first detection of CO in M31's bulge. The 12CO (1-0) and (2-1) lines are both detected in the dust complex D395A/393/384, at 1.3" (~0.35 kpc) from the centre. From these data and from visual extinction data, we derive a CO-luminosity to reddening ratio (and a CO-luminosity to H_2 column density ratio) quite similar to that observed in the local Galactic clouds. The (2-1) to (1-0) line intensity ratio points to a CO rotational temperature and a gas kinetic temperature > 10 K. The molecular mass of the complex, inside a 25' (100 pc) region, is 1.5 10^4 Mo.

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A. -L. Melchior, F. Viallefond, M. Guelin, N. Neininger. 2000-03-03. Detection of CO in the inner part of M31's bulge. https://doi.org/10.1046/j.1365-8711.2000.03326.x

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