On the application of a spherical infall model to the local supercluster

Abstract

view Abstract Citations (17) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the Application of a Spherical Infall Model to the Local Supercluster Lee, H. ; Hoffman, Y. ; Ftaclas, C. Abstract 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. Publication: The Astrophysical Journal Pub Date: May 1986 DOI: 10.1086/184660 Bibcode: 1986ApJ...304L..11L Keywords: Astronomical Models; Celestial Mechanics; Galactic Clusters; Galactic Evolution; Many Body Problem; Algorithms; Cosmology; Local Group (Astronomy); Spatial Distribution; Velocity Distribution; Astrophysics; COSMOLOGY; GALAXIES: CLUSTERING; GALAXIES: FORMATION full text sources ADS | data products SIMBAD (1)