  Recently, some very strong correlations between the distribution of dark
matter and baryons (the dark matter-baryon relations) in galaxies with very
different morphologies, masses, sizes, and gas fractions have been obtained.
Some models have been suggested to explain why the dark matter contribution is
fully specified by that of the baryons. In this article, we derive two analytic
expressions to explain the observed dark matter-baryon relations based on the
cold dark matter (CDM) model. The resultant expressions give excellent
agreement with the observational data. The parameters involved in the analytic
expressions are closely related to the amount of the baryon content. This model
can provide a theoretical understanding of the strong correlations observed. We
suggest that the observed relation represents the end product of galaxy
formation.
