File:CL0024+17.jpg
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DescriptionCL0024+17.jpg |
English: Astronomers using NASA's Hubble Space Telescope have discovered a ghostly ring of dark matter that formed long ago during a titanic collision between two massive galaxy clusters. The ring's discovery is among the strongest evidence yet that dark matter exists. Astronomers have long suspected the existence of the invisible substance as the source of additional gravity that holds together galaxy clusters. Such clusters would fly apart if they relied only on the gravity from their visible stars. Although astronomers don't know what dark matter is made of, they hypothesize that it is a type of elementary particle that pervades the universe.
This Hubble composite image shows the ring of dark matter in the galaxy cluster CL 0024+17. The ring-like structure is evident in the blue map of the cluster's dark matter distribution. The map was derived from Hubble observations of how the gravity of the cluster Cl 0024+17 distorts the light of more distant galaxies, an optical illusion called gravitational lensing. Although astronomers cannot see dark matter, they can infer its existence by mapping the distorted shapes of the background galaxies. The map is superimposed on a Hubble Advanced Camera for Surveys image of the cluster taken in November 2004. Slovenščina: Prstenec tmavej hmoty v kope galaxií CL0024+17. Snímku zhotovil Hubblov vesmírny ďalekohľad v novembri 2004. Prstenec tmavej hmoty má priemer 5 miliónov svetelných rokov. Vznikol pravdepodobne zrážkou dvoch kôp galaxií. (kľúčové slová: tmavá hmota, galaxia, alebo CL0024+17, dark matter, gravitational lensing). |
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Source | http://hubblesite.org/newscenter/archive/releases/2007/17/image/a/ (direct link) | ||||
Author | NASA, ESA, M.J. Jee and H. Ford (Johns Hopkins University) | ||||
Permission (Reusing this file) |
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Other versions |
Annotations InfoField | This image is annotated: View the annotations at Commons |
1201
1217
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3921
3921
one of several images
of same galaxy
lensed by the dark matter
2099
1928
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3921
3921
one of several images
of same galaxy
lensed by the dark matter
Items portrayed in this file
depicts
15 May 2007
image/jpeg
005ca77447892b2f6cc3b8e08432e380398ac140
24,147,234 byte
3,921 pixel
3,921 pixel
File history
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Date/Time | Dimensions | User | Comment | |
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current | 06:33, 19 July 2009 | 3,921 × 3,921 (23.03 MB) | Tryphon | Original size. |
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Image title | IDL TIFF file |
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Width | 3,921 px |
Height | 3,921 px |
Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 100 dpi |
Vertical resolution | 100 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 12:07, 1 May 2007 |
Color space | Uncalibrated |
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