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The Oort Limit

Published online by Cambridge University Press:  14 August 2015

J.J. Binney
J.J. Binney*
Affiliation:
Theoretical Physics Keble Road, Oxford 0X1 3NP, U.K.

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During galaxy formation non-baryonic dark matter is not expected to pack down into a thin disk. Hence the mass-to-light ratio ϒd of the Galactic disk is a key number as the mass-to-light ratio of a purely baryonic system. If ϒd proves to be large, it suggests that the large values of ϒ that are detected elsewhere in the Universe are due to dark baryonic matter rather than some exotic form of matter. Conversely, a small value ϒd lends credence to the idea that most of the mass in the Universe is non-baryonic by suggesting that baryonic systems are well endowed with luminous stars.

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