File:XMM Bullet Group 625.jpg
File originale (1 458 × 1 314 pixel, dimensione del file: 831 KB, tipo MIME: image/jpeg)
Questo file e la sua pagina di descrizione (discussione · modifica) si trovano su Wikimedia Commons (?) |
Dettagli
DescrizioneXMM 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. |
Data | |
Fonte | 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 |
Autore | ESA/XMM-Newton, F. Gastaldello (INAF/IASF, Milano, Italy), CFHTLS, CC BY-SA 3.0 IGO |
Licenza
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.
|
||
Questo file è disponibile in base alla licenza Creative Commons Attribuzione-Condividi allo stesso modo 3.0 OIG Attribuzione: ESA/XMM-Newton, F. Gastaldello (INAF/IASF, Milano, Italy), CFHTLS, CC BY-SA IGO 3.0
|
Elementi ritratti in questo file
raffigura
6 giu 2014
Cronologia del file
Fare clic su un gruppo data/ora per vedere il file come si presentava nel momento indicato.
Data/Ora | Miniatura | Dimensioni | Utente | Commento | |
---|---|---|---|---|---|
attuale | 04:04, 6 lug 2017 | 1 458 × 1 314 (831 KB) | Huntster | Full resolution. | |
09:59, 21 giu 2015 | 625 × 563 (106 KB) | Mylkomeda | User created page with UploadWizard |
Pagine che usano questo file
La seguente pagina usa questo file:
Utilizzo globale del file
Anche i seguenti wiki usano questo file:
- Usato nelle seguenti pagine di uk.wikipedia.org:
Metadati
Questo file contiene informazioni aggiuntive, probabilmente aggiunte dalla fotocamera o dallo scanner usati per crearlo o digitalizzarlo. Se il file è stato modificato, alcuni dettagli potrebbero non corrispondere alla realtà.
Struttura dei pixel | RGB |
---|---|
Orientamento | Normale |
Risoluzione orizzontale | 72 punti per pollice (dpi) |
Risoluzione verticale | 72 punti per pollice (dpi) |
Software | Adobe Photoshop CS5 Macintosh |
Data e ora di modifica del file | 15:07, 5 giu 2014 |
Versione del formato Exif | 2.21 |
Spazio dei colori | sRGB |