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Computing the X-Ray Universe Movie: text

Simulation in a 2-D, co-moving frame

To more clearly see the structure formation process, let's repeat the last sequence and view it in a frame which is comoving with the expanding universe. Here one sees how small fluctuations grow and cluster into larger coherent structures. This behavior is caused by gravity, which has overcome the cosmic expansion and pulled slightly overdense regions into dense filaments, seen here in green. The intersection of filaments, seen in red, locate where rich clusters of galaxies form, as well as their hot X-ray halos.


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NCSA. Last modified, 10/12/95