Cosmological parameters from proper motion reconstruction

Details Cosmological parameters from proper motion reconstruction Cosmological parameters from proper motion reconstruction

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..679m&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

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The peculiar velocities of a large number of galaxies can be uniquely reconstructed using present redshift surveys. Our method, based on minimisation of Euler-Lagrange action, performs extremely well when tested against simulations. We apply our method to the updated NBG redshift galaxy catalogue and reconstruct the peculiar velocity field in our local supercluster. The requirement of the optimal correlation between the radial components of reconstructed velocities and the observed peculiar velocities derived from our extensive new catalog of distances puts stringent constraints on the values of the cosmological parameters. Our constraints intersect those from studies of microwave background fluctuations and statistical properties of galaxy clustering: the ensemble of constraints are consistent with Ωm=0.22±0.02.

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