Dark Matter separation from ordinary matter

Dark Matter separation from ordinary matter - Dark Matter...

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Dark Matter separation from ordinary matter The collision of the galaxy cluster 1E 0657-56, called the "bullet cluster", with another galaxy cluster has produced a clear separation of the ordinary matter from the dark matter. The ordinary matter of one cluster is slowed by a drag force as it interacts with the gas (ordinary matter) of the other cluster. The dark matter is not slowed by the impact because it responds only to gravity and is not affected by gas pressure. In the picture below, the ordinary matter is colored pink---it is hot gas imaged by the Chandra X-ray Observatory . The blue areas are where most of the mass in the clusters is found (the dark matter). The dark matter locations were determined by gravitational lensing of light from background galaxies. Select the Chandra link to view animations of how the separation happened. The more recent observation of the MACS J0025.4-1222 cluster collision has shown the same sort of separation of dark matter from ordinary matter.
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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Dark Matter separation from ordinary matter - Dark Matter...

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