Analytical and Numerical Models of Turnaround Densities in ΛCDM

Details Analytical and Numerical Models of Turnaround Densities in ΛCDM Analytical and Numerical Models of Turnaround Densities in ΛCDM

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.5307p&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #53.07; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We will present numerical calculations of gravitating systems in a ΛCDM universe and determine the range of densities required to achieve turnaround. We use the Numerical Action Method to examine realistic models of up to 5 galaxies forming a group originating in a nearly homogeneous expanding medium. We show the effects of tidal fields and nonspherical, nonlinear interactions. We provide a fitting formula for the turnaround mass as a function of Λ based on analytical calculation of spherical infall. The fitting formula provides a ratio of the turnaround density with Λ to that given by the conventional formula for Λ=0. This work is part of an effort to study the mass distributions in nearby groups to model future SIM observations of transverse motions of galaxies.

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