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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.
(Credit: X-ray: NASA/CXC/E.O'Sullivan et al; Optical: Palomar DSS)
|This file is in the public domain because it was 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.)
|Orientation of image||1|
|Image resolution in width direction||72|
|Image resolution in height direction||72|
|Unit of X and Y resolution||2|
|Color space information||1|
|Exif image width||576|
|Exif image length||463|
|Software used||Adobe Photoshop CS Windows|
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