File:Abell 2218 z1 (very distant galaxy).jpg
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Summary[edit]
DescriptionAbell 2218 z1 (very distant galaxy).jpg |
English: The central picture shows Abell 2218, a rich galaxy cluster composed of thousands of individual galaxies. It sits about 2.1 billion light-years from the Earth (redshift 0.17) in the northern constellation of Draco. When used by astronomers as a powerful gravitational lens to magnify distant galaxies, the cluster allows them to peer far into the Universe. However, it not only magnifies the images of hidden galaxies, but also distorts them into long, thin arcs. Several arcs in the image can be studied in detail thanks to Hubble's sharp vision. Multiple distorted images of the same galaxies can be identified by comparing the shape of the galaxies and their colour. In addition to the giant arcs, many smaller arclets have been identified. The pictures along the right edge show one of the galaxies viewed at approximately redshift 7.5 with the help of the gravitational lens. The galaxy cannot be seen in the top image, which was taken in the visual range by ACS. In the middle image, taken in the near-infrared by ACS, the galaxy becomes barely visible in the circled region. The galaxy finally becomes fully visible in the bottom image, which is taken by NICMOS in the infrared. The galaxy is visible in the near-infrared region of the electromagnetic spectrum rather than the visible part because during the 13 billion years the light spent travelling to Earth, the Universe has expanded enough to broaden the wavelength from the visible into the near-infrared. |
Date | |
Source | http://cdn.spacetelescope.org/archives/images/large/heic0814e.jpg |
Author |
NASA, ESA, and Johan Richard (Caltech, USA) |
Licensing[edit]
Public domainPublic domainfalsefalse |
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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This file, which was originally posted to
https://www.spacetelescope.org/images/heic0814e/, was reviewed on 17 December 2015 by reviewer Shizhao, who confirmed that it was available there under the stated license on that date.
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Image title |
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Source | ESA/Hubble |
Credit/Provider | NASA, ESA, and Johan Richard (Caltech, USA)Acknowledgement: Davide de Martin & James Long (ESA/Hubble) |
Short title |
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Usage terms |
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Date and time of data generation | 17:00, 24 July 2008 |
Contact information |
http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
Keywords | Abell 2218 |
IIM version | 4 |