Astrophys. J., 850, 207-207 (2017/December-1)
Action dynamics of the Local Supercluster.
SHAYA E.J., TULLY R.B., HOFFMAN Y. and POMAREDE D.
Abstract (from CDS):
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 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 that 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 H0 to the CosmicFlows value of 75 km s–1 Mpc–1 and the WMAP value for Ωm = 0.244 consistent with that H0, occurs with the following parameters: Ωorphan = 0.077 ± 0.016, M/LK=40±2L100.15M☉/L☉ (L10 is the K-band luminosity in units of 1010 L☉), a Virgo mass of 6.3 ± 0.8 x 1014 M☉ (M/LK = 113 ± 15 M☉/L☉), and a mass for the MW plus M31 of 5.15 ± 0.35 x 1012 M☉. The best constant mass-to-light ratio is M/LK = 58 ± 3 M☉/L☉. The Virgocentric turnaround radius is 7.3 ± 0.3 Mpc. We explain several interesting trends in peculiar motions for various regions now that we can construct the 3D orbital histories.
© 2017. The American Astronomical Society. All rights reserved.
cosmological parameters - galaxies: distances and redshifts - galaxies: kinematics and dynamics - large-scale structure of universe - Local Group - Local Group
VizieR on-line data:
<Available at CDS (J/ApJ/850/207): table2.dat>
Table 2: [T2015] nest 3NNNNN N=58 among (Nos 300001-300426) added.
View the references in ADS
To bookmark this query, right click on this link: simbad:2017ApJ...850..207S and select 'bookmark this link' or equivalent in the popup menu