The closest spiral galaxy, M31, is certainly a key target to study the properties of molecular clouds outside the Milky Way. In this contribution, we use the millimeter CO data obtained with the IRAM 30m telescope and Plateau de Bure interferometer to derive the properties of the GMCs in M31, with a special focus on their mass and on the CO to H2conversion factor.
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Muller, S., Guélin, M., Ungerechts, H., Loinar, L., Lucas, R., Wielebinski, R. (2008). Molecular Gas in the Andromeda Galaxy: Properties of the Molecular Clouds. In: Wada, K., Combes, F. (eds) Mapping the Galaxy and Nearby Galaxies. Astrophysics and Space Science Proceedings. Springer, New York, NY. https://doi.org/10.1007/978-0-387-72768-4_29
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