: Astronomía: mass-to-light ratio

physical parameter > mass-to-light ratio

mass-to-light ratio

In astrophysics and physical cosmology the mass-to-light ratio, normally designated with the Greek letter upsilon, ϒ, is the quotient between the total mass of a spatial volume (typically on the scales of a galaxy or a cluster) and its luminosity. These ratios are often reported using the value calculated for the Sun as a baseline ratio which is a constant ϒ_☉ = 5133 kg/W: equal to the solar mass M_☉ divided by the solar luminosity L_☉, M_☉/L_☉. The mass-to-light ratios of galaxies and clusters are all much greater than ϒ_☉ due in part to the fact that most of the matter in these objects does not reside within stars and observations suggest that a large fraction is present in the form of dark matter. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Mass-to-light_ratio)

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