Reconstruction of large-scale peculiar velocity fields

Details Reconstruction of large-scale peculiar velocity fields Reconstruction of large-scale peculiar velocity fields

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cic..book..123m&link_type=abstract

In: Current issues in cosmology. Edited by Jean-Claude Pecker and Jayant Narlikar. Cambridge, UK: Cambridge University Press, IS

Physics

1

Universe: Large-Scale Structure

Scientific paper

A reconstruction method for recovering the initial conditions of the Universe starting from the present galaxy distribution is presented, which guarantees uniqueness of solutions. We show how our method can be used to obtain the peculiar velocities of a large number of galaxies, hence trace galaxies' orbits back in time and obtain the entire past dynamical history of the Universe above scales where multi-streaming has not occurred. When tested against a 1283 ΛCDM simulation in a box of 200 h-1 Mpc length, we obtain 60% exact reconstruction on scales above 6 h-1 Mpc. We apply our method to a real galaxy redshift catalog, the updated NBG (Nearby Galaxies), containing 1483 groups, and clusters in a radius of 30 Mpc h-1, and reconstruct the peculiar velocity fields in the local neighborhood. Our reconstructed distances are well matched to the observed values outside the collapsed regions if Ωm(t)=0.20exp(-0.26(t-13)), where t is the age of the Universe in Gyrs.

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