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

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

2000-03-03

arxiv.org/abs/astro-ph/0003037v1

Mon.Not.Roy.Astron.Soc. 312 (2000) L29

Astronomy and Astrophysics

Astrophysics

5 pages including 4 figures (2 in colour)

Scientific paper

10.1046/j.1365-8711.2000.03326.x

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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