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Tuesday, May 5, 2009

Dark matter 'highway' funnels gas into galactic pileup

The remnants of four different galaxy clusters comprise the large cluster MACSJ0717. The galaxy cluster labelled "C" is thought to be the "original" cluster, while the motions (arrows) of clusters B, D, and A are all thought to have been funnelled into the cluster from an attached filament (lower left). (The cluster labelled "A" is thought to have moved through the larger cluster once and is now falling back towards its centre.) (Image: X-ray (NASA/CXC/IfA/C Ma et al.); Optical (NASA/STScI/IfA/C Ma et al.))The first tantalizing signs of gas within a filament of dark matter have been glimpsed at the site of a cataclysmic collision between galaxy clusters.

Dark matter 'highway'

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