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21 February 2010
Dark Matter in Distant Galaxy Groups Mapped for the First Time

Galaxy density in the Cosmic Evolution Survey (COSMOS) field, with colors representing the redshift of the galaxies, ranging from redshift of 0.2 (blue) to 1 (red). Pink x-ray contours show the extended x-ray emission as observed by XMM-Newton. Dark matter (actually cold, dark – non-baryonic – matter) can be detected only by its gravitational influence. In [...]

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Filed under: Astronomy, Dark Matter, Dark Energy, Cosmology, esa, XMM-Newton, Gravitational Lensing, galaxies, X-ray astronomy, clusters