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The color scale shows the percent deviation from the overall average background derived from all 21 pointings in this instrumental configuration. After applying the H-test filter, the raw data were blocked 8x8 and then, after averaging, smoothed using a Gaussian with a sigma of 40 blocked pixels. The color scale was set to be the same for all the percentage plots. This data can also be seen as a color contour map of the count rate and as a 3-D projection on an absolute scale.
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The Chandra X-Ray
Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA. Email: cxcweb@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2004. All rights reserved. |