CL0024+17

CL0024+17
The CL0024+17 cluster of galaxies Credit: NASA/ESA/HST
Observation data (Epoch J2000)
Constellation(s)	Pisces[1]
Right ascension	0h 26m 35s[1]
Declination	+17° 9′ 43″[1]
Other designations
ZwCl 0024+1652[1]
See also: Galaxy groups and clusters, List of galaxy clusters
v · d · e

The cluster CL0024+17 is a cluster of galaxies located in Pisces. Cl 0024+17, is allowing astronomers to probe the distribution of dark matter in space. The blue streaks near the center of the image are the smeared images of very distant galaxies that are not part of the cluster. The distant galaxies appear distorted because their light is being bent and magnified by the powerful gravity of Cl 0024+17, an effect called gravitational lensing.

Dark matter cannot be seen because it does not shine or reflect light. Astronomers can only detect its influence by how its gravity affects light. By mapping the distorted light created by gravitational lensing, astronomers can trace how dark matter is distributed in the cluster. While mapping the dark matter, astronomers found a dark-matter ring near the cluster's center. The ring's discovery is among the strongest evidence that dark matter exists.

The gravity map is superimposed on a Hubble image of the cluster CL0024+17. Credit: NASA/ESA/HST

See also

• Dark matter

External links

• HubbleSite NewsCenter:Hubble pictures of CL0024+17 group
• Press release and more images and video presentations of CL0024+17 at Spacetelescope.org

References

1. ^ ^{a b c d} "HubbleSite NewsCenter". Results for Cl 0024+17. http://hubblesite.org/newscenter/archive/releases/2007/17/fastfacts/. Retrieved 2007-05-16.