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Gravitational Lens

Galaxy Cluster Abell 1689 Deflects Light

Galaxy Cluster Abell 1689 Deflects Light




Credit: NASA, ESA, Hubble Heritage Team (STScI/AURA), and J. Blakeslee (NRC Herzberg, DAO) & H. Ford (JHU)

Explanation: It is one of the most massive objects in the visible universe. In this view from the Hubble Space Telescope's Advanced Camera for Surveys, Abell 1689 is seen to warp space as predicted by Albert Einstein's theory of gravity - deflecting light from individual galaxies which lie behind the cluster to produce multiple, curved images. The power of this enormous gravitational lens depends on its mass, but the visible matter, in the form of the cluster's yellowish galaxies, only accounts for about one percent of the mass needed to make the observed bluish arcing images of background galaxies. In fact, most of the gravitational mass required to warp space enough to explain this cosmic scale lensing is in the form of still mysterious dark matter. As the dominant source of Abell 1689's gravity, the dark matter's unseen presence is mapped out by the lensed arcs and distorted background galaxy images. Surprisingly, close inspection of the above image has revealed the presence of over 100,000 globular star clusters in the galaxy cluster. from Astronomy Picture of the Day

Is this the lensing effect Russell wrote so much about?

See Also

Figure 3.4 - Focalizing Lenses at nested Cube faces
Lens
Mirrors and Lens of Cosmic Cinema

Page last modified on Tuesday 17 of September, 2013 04:33:14 MDT

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