The Consistency of Cosmic Flows on 100 Mpc/h Scales

Details The Consistency of Cosmic Flows on 100 Mpc/h Scales The Consistency of Cosmic Flows on 100 Mpc/h Scales

2003-11-04

arxiv.org/abs/astro-ph/0311072v1

Astronomy and Astrophysics

Astrophysics

Talk given at the 15th Rencontres De Blois: Physical Cosmology: New Results In Cosmology And The Coherence Of The Standard Mod

Scientific paper

We have compared the bulk flow of recent large-scale peculiar velocity surveys (SMAC, SC, Lauer and Postman, Willick, EFAR and Tonry's SNIa sample) to each other, allowing for the errors due to sparse sampling. We conclude that, contrary to the current perception, there is no significant conflict between these surveys. The combined peculiar velocity dataset samples a volume $\sim 100 \h^{-1}$ mpc in radius and has a bulk flow of $350 \pm 80 $ km/s. Allowing for the sparse sampling, we find that this result is not in conflict with the $\Lambda$CDM models. Structure(s) responsible for the large-scale motion have not yet been identified, but some likely suspects are presently under surveillance.

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