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

To see the causes for these distortions click here

To go back to my home page click here

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

Hume Feldman
Last modified: Tue Feb 13 00:41:02 MET 2001