File:Two Models of Black Hole Spin.jpg
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DescriptionTwo Models of Black Hole Spin.jpg |
English: Scientists measure the spin rates of supermassive black holes by spreading the X-ray light into different colors. The light comes from accretion disks that swirl around black holes, as shown in both of the artist's concepts. They use X-ray space telescopes to study these colors, and, in particular, look for a "fingerprint" of iron -- the peak shown in both graphs, or spectra -- to see how sharp it is. Prior to observations with NASA's Spectroscopic Telescope Array, or NuSTAR, and the European Space Agency's XMM-Newton telescope, there were two competing models to explain why this peak might not appear to be sharp.
The "rotation" model shown at top held that the iron feature was being spread out by distorting effects caused by the immense gravity of the black hole. If this model were correct, then the amount of distortion seen in the iron feature should reveal the spin rate of the black hole. The alternate model held that obscuring clouds lying near the black hole were making the iron line appear artificially distorted. If this model were correct, the data could not be used to measure black hole spin. NuSTAR helped to solve the case, ruling out the alternate "obscuring cloud" model. Its high-energy X-ray data -- shown at top as green bump to the right of the peak -- revealed that features in the X-ray spectrum are in fact coming from the accretion disk and not from the obscuring clouds. Together with XMM-Newton, the space observatories were able to make the first conclusive measurement of a black hole's spin rate, and more generally, confirm that the "gravitational distortion" model is accurate. |
Date | |
Source | http://www.nasa.gov/mission_pages/nustar/multimedia/pia16697.html |
Author | NASA/JPL-Caltech |
Other versions | Derivative works of this file: Two Models of Black Hole Spin fr.jpg: |
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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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current | 10:29, 28 February 2013 | 3,476 × 2,607 (1.02 MB) | Stas1995 (talk | contribs) | User created page with UploadWizard |
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Width | 3,600 px |
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Height | 2,400 px |
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Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CS3 Windows |
File change date and time | 15:53, 26 February 2013 |
Color space | sRGB |
Image width | 3,476 px |
Image height | 2,607 px |
Date and time of digitizing | 07:53, 26 February 2013 |
Date metadata was last modified | 07:53, 26 February 2013 |
Unique ID of original document | xmp.did:F8C63FF4332368118083D5AEDB69C17D |