Molecules in external galaxies

Mathematics – Logic

Scientific paper

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Interstellar Matter, Molecular Clouds, Spiral Galaxies, Stellar Evolution, Carbon Monoxide, Radial Distribution, Supermassive Stars

Scientific paper

Studies of the interstellar medium in late spiral galaxies are discussed. The one-to-one proportionality between H2 mass and optical luminosity as a function of radius and from galaxy to galaxy within a single morphological class suggests that the bulk of star formation may occur in molecular clouds independently of their location within the galaxy. The clouds are enormously massive, so if most of the star forming material is within them, it is well shielded and insulated from the external environment. The rate of star formation throughout most of a given cloud cannot therefore be easily influenced by external effects such as spiral shocks or even supernovae. However, formation of massive stars is correlated with spiral arms, suggesting that a fraction of the overall rate of star formation is triggered by the external environment.

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