At multiplicities lower than solar, this would increase to an even large age.

\[sec:MLdiscussion\]

Decomposition Strategy
----------------------

We start with the assumption that there are three components, stars, gas+dust and dark matter. Each of these components add to the gravitational potential, so ideally one would need to write down and solve the combined Poisson-Boltzmann equation. This is internally consistent, but requires simplifying assumptions such as on the properties of the stellar velocity tensor (e.g. that it is Gaussian and isothermal or a superposition of such components) and its variation in space. This approach, which indeed is self-consistent, has been used by the earlier workers referred to above, starting with @Olling1996A.

Our stategy is the following. We infer the radial force near the plane of the galaxy from the [ <span style="font-variant:small-caps;">HI</span> ]{}rotation curve, assuming that due to the relative low velocity dispersion of order 10 [[km s$^{-1}$]{}]{}the asymetric drift term in the Jeans equation can be ignored. Next we model the light distribution and assuming a constant mass-to-light ratio estimate the contribution of the disk up the a free parameter $M/L$. We do the same from the inferred mass distribution of gas, adding the usual contribution (25% of the total) 