File:Chamaeleon I cloud.png
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![File:Chamaeleon I cloud.png](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b2/Chamaeleon_I_cloud.png/550px-Chamaeleon_I_cloud.png?20141121070048)
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[編輯]描述Chamaeleon I cloud.png |
English: This image shows a ROSAT PSPC false-color image of the Chamaeleon I dark cloud, a well-known site of star formation. The contours show the 100 micron emission from dust in this cloud as measured by the infrared IRAS satellite. This image was made from X-rays with energies between 500 eV and 1100 eV. Since these soft (low energy) X-rays are absorbed by interstellar dust and gas, the observation of a "shadow" provides an indication of the intensity of X-rays coming from behind the absorbing cloud. X-ray "shadows" like this are the X-ray analog of well-known optical dark nebulae such as the Horsehead Nebula, produced by absorption in a dark cloud of optical photons emitted in a bright nebula behind the cloud. In the X-ray case, the entire sky is bright with a diffuse glow known as the diffuse X-ray background (somewhat like the night sky as seen from a modern city, where scattered light from street lamps produces a bright glow in the sky and washes out all but the brightest stars). Observations like this will help us understand the source of the diffuse X-ray background at these energies, which is known to be different from the 1/4 keV diffuse background shown in our image of the Draco nebula in this directory. |
日期 | |
來源 | HEASARC ROSAT Guest Observer Facility, url=http://heasarc.nasa.gov/docs/rosat/gallery/misc_shadow_cham.html |
作者 | This work was done by Dr. David Burrows and graduate student Jeff Mendenhall of the Penn State Department of Astronomy & Astrophysics, and is based on a mosaic of images collected by Dr. Burrows and by Dr. Eric Feigelson of Penn State using the US/German ROSAT satellite. |
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Images from NASA usually are free of copyright. |
Curator: Michael Arida (SP Sys); arida@milkyway.gsfc.nasa.gov HEASARC Guest Observer Facility
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[編輯]Public domainPublic domainfalsefalse |
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本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zh,NASA版權政策或JPL圖像使用政策) | ![]() |
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[編輯]日期/時間 | 尺寸 | 使用者 | 備註 |
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2009年12月29日, 00:51:08 | 727 × 792 (186530 bytes) | Marshallsumter (留言 · 貢獻) | {{Information |Description={{en|1=This image shows a ROSAT PSPC false-color image of the Chamaeleon I dark cloud, a well-known site of star formation. The contours show the 100 micron emission from dust in this cloud as measured by the infrared IRAS satel |
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日期/時間 | 縮圖 | 尺寸 | 使用者 | 備註 | |
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目前 | 2014年11月21日 (五) 07:00 | ![]() | 727 × 792(116 KB) | GifTagger(留言 | 貢獻) | Bot: Converting file to superior PNG file. (Source: Chamaeleon_I_cloud.gif). This GIF was problematic due to non-greyscale color table. |
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- Plasmas/Plasma objects/Coronal clouds
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- Portal:Radiation astronomy/Pictures/28
- Portal:Radiation astronomy/X-ray astronomy article
- Portal:Radiation astronomy/X-ray astronomy article/30
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