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File:NGC-4555.jpg

NGC-4555.jpg ‎(576 × 463 pixels, file size: 176 KB, MIME type: image/jpeg)

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X-ray/Optical Composite of NGC 4555

Dark matter continues to confound astronomers, as NASA's Chandra X-ray Observatory demonstrated with the detection of an extensive envelope of dark matter around an isolated elliptical galaxy. This discovery conflicts with optical data that suggest a dearth of dark matter around similar galaxies, and raises questions about how galaxies acquire and keep such dark matter halos. (Description from http://chandra.harvard.edu/photo/2004/ngc4555/more.html#ngc4555_comp)

Scale: Image is 8 x 6.5 arcmin per side.

http://chandra.harvard.edu/photo/2004/ngc4555/more.html#ngc4555_comp

(Credit: X-ray: NASA/CXC/E.O'Sullivan et al.; Optical: Palomar DSS)

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Public domain 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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Date/TimeThumbnailDimensionsUserComment
current07:32, 15 November 2010Thumbnail for version as of 07:32, 15 November 2010576 × 463 (176 KB)Garrondo (talk | contribs)Higher quality. Adequate source
01:38, 21 June 2007Thumbnail for version as of 01:38, 21 June 2007324 × 271 (54 KB)RedAndr (talk | contribs)NGC 4555 galaxy http://rst.gsfc.nasa.gov/Sect20/ngc4555.jpg

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