File:XMM Bullet Group 625.jpg
Original file (1,458 × 1,314 pixels, file size: 831 KB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionXMM Bullet Group 625.jpg |
Italiano: This image shows the Bullet Group, a group of galaxies also known as SL2S J08544-0121.
The galaxies belonging to the group are visible in the central part of the image, embedded in the diffuse dark matter (shown in blue). Hot gas, which fills the space between galaxies and comprises the bulk of ordinary (baryonic) matter in the group, is shown in pink, as imaged by ESA's XMM-Newton X-ray observatory. The light from galaxies and hot gas belonging to the group, which lies at a redshift of z=0.351, has been travelling for almost four billion years before reaching us. Other galaxies, either in the foreground or background of the Bullet Group, are sprinkled across the image, as well as bright foreground stars that belong to our Galaxy. The group's components appear to be clearly separated, with the hot gas partitioned from the rest of the mass within the group. This is the smallest object ever found to show such an effect, which was caused by a merger in the group's past. Astronomers were able to map the extent of the Bullet Group's dark matter through its gravitational lensing of background galaxies. This effect is particularly evident in the centre-right part of this image, where a round, bright galaxy that belongs to the Bullet Group is circled by curious arcs of light – the distorted image of another galaxy lying much farther away. By exploring the contents of these cosmic wrecks, astronomers can learn more about the properties of dark matter. In particular, from the split between the dark matter and the hot gas, they can constrain how much dark matter does – or does not – interact with normal matter. This image is a composite of an X-ray image (shown in pink) from ESA's XMM-Newton observatory, a three-colour (red, green, blue) optical image from the Canada-France-Hawaii Telescope (CFHT), and a dark matter overlay (indicated in blue) based on data from CFHT, the NASA/ESA Hubble Space Telescope, and the W. M. Keck Observatory. |
Date | |
Source | http://sci.esa.int/xmm-newton/54117-the-bullet-group/ (image link); see also https://xmm-tools.cosmos.esa.int/external/xmm_science/gallery/public/level3.php?id=1190 |
Author | ESA/XMM-Newton, F. Gastaldello (INAF/IASF, Milano, Italy), CFHTLS, CC BY-SA 3.0 IGO |
Licensing
[edit]This media was created by the European Space Agency (ESA).
Where expressly so stated, images or videos are covered by the Creative Commons Attribution-ShareAlike 3.0 IGO (CC BY-SA 3.0 IGO) licence, ESA being an Intergovernmental Organisation (IGO), as defined by the CC BY-SA 3.0 IGO licence. The user is allowed under the terms and conditions of the CC BY-SA 3.0 IGO license to Reproduce, Distribute and Publicly Perform the ESA images and videos released under CC BY-SA 3.0 IGO licence and the Adaptations thereof, without further explicit permission being necessary, for as long as the user complies with the conditions and restrictions set forth in the CC BY-SA 3.0 IGO licence, these including that:
See the ESA Creative Commons copyright notice for complete information, and this article for additional details.
|
||
This file is licensed under the Creative Commons Attribution-ShareAlike 3.0 IGO license. Attribution: ESA/XMM-Newton, F. Gastaldello (INAF/IASF, Milano, Italy), CFHTLS, CC BY-SA IGO 3.0
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 02:04, 6 July 2017 | 1,458 × 1,314 (831 KB) | Huntster (talk | contribs) | Full resolution. | |
07:59, 21 June 2015 | 625 × 563 (106 KB) | Mylkomeda (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on it.wikipedia.org
- Usage on uk.wikipedia.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Pixel composition | RGB |
---|---|
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS5 Macintosh |
File change date and time | 15:07, 5 June 2014 |
Exif version | 2.21 |
Color space | sRGB |