File:Chamaeleon I cloud.png
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[编辑]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 | |
来源 | 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. |
授权 (二次使用本文件) |
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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[编辑]Public domainPublic domainfalsefalse |
本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zh、NASA版权方针页面或JPL图片使用方针。) | ||
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[编辑]日期/时间 | 大小 | 用户 | 备注 |
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2009年12月29日, 00:51:08 | 727 × 792 (186530 bytes) | Marshallsumter (留言 · 贡献) | {{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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当前 | 2014年11月21日 (五) 07:00 | 727 × 792(116 KB) | GifTagger(留言 | 贡献) | 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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