Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304l..11l&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 304, May 1, 1986, p. L11-L15.
Astronomy and Astrophysics
Astronomy
17
Astronomical Models, Celestial Mechanics, Galactic Clusters, Galactic Evolution, Many Body Problem, Algorithms, Cosmology, Local Group (Astronomy), Spatial Distribution, Velocity Distribution
Scientific paper
The application of a spherical, nonlinear infall model to the Local Supercluster (LSC), and in particular its reliability as a cosmological probe of Omega(0), are studied by means of N-body simulations. An N-body model of a flat universe with an initial Poisson distribution has been analyzed by identifying objects similar to the LSC, and calculating the apparent values of Omega(0), Omega(st), by the standard (nonlinear spherical infall) model. The distribution of the values of Omega(st) ranges from 0.65 to 1.05 with a mean of 0.92, compared to the Omega(0) = 1.0 of the simulation. The value Omega(st) is correlated with the structure of the velocity field and the more spherical superclusters are found to underestimate Omega(0) by 20 percent-40 percent. The derived values of Omega(0) are in the same range of values predicted by the 1985 quasi-linear model of Hoffman. An implication of the present study is that the standard cosmological scenario of a flat universe is incompatible with the observed LSC.
Ftaclas Chris
Hoffman Yehuda
Lee Hyunyoung
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