Journal Article

Precision constrained simulation of the local Universe

G. Lavaux

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 2, pages 1007-1013
Published in print August 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16719.x
Precision constrained simulation of the local Universe

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We use the formalism of constrained Gaussian random fields to compute a precise large-scale simulation of the 60 h−1 Mpc volume of our local Universe. We derive the constraints from the reconstructed peculiar velocities of the 2MASS (Two Micron All-Sky Survey) Redshift Survey (2MRS). We obtain a correlation of 0.97 between the log density field of the dark matter distribution of the simulation and the log density of observed galaxies of the local Universe. We achieve a good comparison of the simulated velocity field to the observed velocity field obtained from the galaxy distances of the Nearby Galaxy Catalog 3000 km s−1 (NBG-3k, Tully et al.). At the end, we compare the two-point correlation function of both the 2MRS galaxies and the dark matter particles of the simulation. We conclude that this method is a very promising technique for exploring the dynamics and structure of the Universe in our neighbourhood.

Keywords: methods: numerical; galaxies: statistics; dark matter; large-scale structure of Universe

Journal Article.  4654 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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