Ficheru:MACS 0717.jpg
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Ficheru orixinal (3000 × 2911 píxels, tamañu de ficheru: 2,88 MB, triba MIME: image/jpeg)
Resume
| Descripción |
English: This composite image shows the massive galaxy cluster MACS J0717.5+3745 (MACS J0717, for short), where four separate galaxy clusters have been involved in a collision — the first time such a phenomenon has been documented. Hot gas is shown in an image from NASA's Chandra X-ray Observatory, and galaxies are shown in an optical image from the NASA/ESA Hubble Space Telescope. The hot gas is colour-coded to show temperature, where the coolest gas is reddish purple, the hottest gas is blue, and the temperatures in between are purple.
The repeated collisions in MACS J0717 are caused by a 13-million-light-year-long stream of galaxies, gas, and dark matter — known as a filament — pouring into a region already full of matter. A collision between the gas in two or more clusters causes the hot gas to slow down. However, the massive and compact galaxies do not slow down as much as the gas does, and so move ahead of it. Therefore, the speed and direction of each cluster's motion — perpendicular to the line of sight — can be estimated by studying the offset between the average position of the galaxies and the peak in the hot gas. MACS J0717 is located about 5.4 billion light-years from Earth. It is one of the most complex galaxy clusters ever seen. Other well-known clusters, like the Bullet Cluster and MACS J0025.4-1222, involve the collision of only two galaxy clusters and show much simpler geometry. |
| Data | (released) |
| Fonte | http://www.spacetelescope.org/images/opo0917a/ |
| Autor | NASA, ESA, CXC, C. Ma, H. Ebeling and E. Barrett (University of Hawaii/IfA), et al. and STScI |
Llicencia
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This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use. The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org. For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag. |
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Este archivo es de dominio público porque fue creado por la NASA. Las políticas sobre copyright de la NASA estipulan que «el material de la NASA no está protegido con copyright a menos que se indique lo contrario». (Políticas sobre copyright de la NASA o Políticas sobre la utilización de imágenes del Jet Propulsion Laboratory). |  |
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| Data/Hora | Miniatura | Dimensiones | Usuariu | Comentariu | |
|---|---|---|---|---|---|
| actual | 13:31 12 och 2010 | | 3000 × 2911 (2,88 MB) | Jmencisom | {{Information |Description={{en|1=This composite image shows the massive galaxy cluster MACS J0717.5+3745 (MACS J0717, for short), where four separate galaxy clusters have been involved in a collision — the first time such a phenomenon has been document |
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