Action Dynamics of the Local Supercluster
  The fully nonlinear gravitationally induced trajectories of a nearly complete
set of galaxies, groups, and clusters in the Local Supercluster are constructed
in a Numerical Action Method (NAM) model constrained by data from the
CosmicFlows survey and various distance indicators. We add the gravity field
due to inhomogeneities external to the sample sphere by making use of larger
scale peculiar flow measurements. Assignments of total masses were made to find
the best overall set of mutual attractions, as determined by a goodness
criterion based on present day radial velocities, individually for the Virgo
Cluster, M31, and the Milky Way (MW), and via a mass-to-light ratio
relationship for other masses. The low median chi-square found indicates the
model fits the present day velocity flow well, but a slightly high mean
chi-square may indicate that some masses underwent complex orbits. The best
fit, when setting the value of $H_0$ to the CosmicFlows value of 75 km/s/Mpc
and the WMAP value for $\Omega_m=0.244$ consistent with that $H_0$, occurs with
the following parameters: $\Omega_{orphan} = 0.077\pm0.016$, $M/L_K $= $40 \pm
2$ $L_{10}^{0.15}$ $M_\odot/L_\odot$ ($L_{10}$ is K-band luminosity in units of
$10^{10} L_\odot$), a Virgo mass of $6.3\pm0.8 \times 10^{14} M_\odot$ ($M/L_K
= 113\pm15 M_\odot/L_\odot$), and a mass for the MW plus M31 of $5.15\pm0.35
\times 10^{12} M_\odot$. The best constant mass-to-light ratio is $M/L_K =
58\pm3 M_\odot/L_\odot$. The Virgocentric turnaround radius is $7.3\pm0.3$ Mpc.
We explain several interesting trends in peculiar motions for various regions
now that we can construct the 3D orbital histories.
