File:Abell 1689.jpg

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Original file ‎(3,853 × 3,902 pixels, file size: 4.14 MB, MIME type: image/jpeg)

Captions

Captions

The galaxy cluster Abell 1689, with the mass distribution of the dark matter in the gravitational lens overlaid (in purple)

Summary[edit]

Description
English: This image shows the galaxy cluster Abell 1689, with the mass distribution of the dark matter in the gravitational lens overlaid (in purple). The mass in this lens is made up partly of normal (baryonic) matter and partly of dark matter. Distorted galaxies are clearly visible around the edges of the gravitational lens. The appearance of these distorted galaxies depends on the distribution of matter in the lens and on the relative geometry of the lens and the distant galaxies, as well as on the effect of dark energy on the geometry of the Universe.
Date
Source http://www.spacetelescope.org/images/heic1014a/
Author NASA, ESA, E. Jullo (JPL/LAM), P. Natarajan (Yale) and J-P. Kneib (LAM).
Other versions http://hubblesite.org/newscenter/archive/releases/2010/26/image/a/

Description from File:Dark_matter_map_in_Abell_1689_(based_on_a_Hubble_Space_Telescope_image).jpg This is the Hubble Space Telescope image of the inner region of Abell 1689, an immense cluster of galaxies located 2.2 billion light-years away. Dark matter in the cluster is mapped by plotting the plethora of arcs produced by the light from background galaxies that is warped by the foreground cluster's gravitational field. Dark matter cannot be photographed, but its distribution is shown in the blue overlay. The dark matter concentration and distribution is then used to better understand the nature of dark energy, a pressure that is accelerating the expansion of the universe. The imaging data used in the natural-color photo was taken in 2002 with Hubble's Advanced Camera for Surveys.

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