Peculiar velocities in large-scale structure - The problem of incomplete sampling

Details Peculiar velocities in large-scale structure - The problem of incomplete sampling Peculiar velocities in large-scale structure - The problem of incomplete sampling

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..344b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 20, 1990, p. 344-353.

Astronomy and Astrophysics

Astrophysics

7

Galactic Clusters, Galactic Structure, Many Body Problem, Mass Distribution, Velocity Distribution, Group Velocity, Red Shift

Scientific paper

Using N-body simulations of gravitational clustering scenarios with various amounts of power on large scales, the nature of observed peculiar velocity field that arises when incompletely sampling a distant but very large structure is examined. Consideration is given to the effect of placing the centroid of a large mass distribution at a distance of 45/h Mpc from the observer and imposing a distance cutoff such that only the near side of this mass distribution is actually sampled. Under these circumstances, simulations with significant large-scale power produce clusters which can have mean peculiar velocities of as high as 600 km/s, but this is rare. A more typical value is 300-400 km/s. The effects of projection, distance errors, and cluster internal velocity dispersion on the observed peculiar velocity field are evaluated. It is concluded that much of the cluster peculiar velocities are due to infall at or near the turnaround radius of the largest structure at the simulation center.

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