Redshift-distortions

Redshift maps have two principal distortions

1. Fingers of God: Radial stretching pointed at the observer. They come about because of random velocities in clusters of galaxies.
2. Large over densities (walls) lead to a coherent "bulk" motion: Walls appear denser and fluffier, voids bigger and emptier.

For a few realistic simulations click here

These pages were made possible with the help of an NSF grant AST-0070702