File:ABELL 2147 83074000 rad.gif
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ABELL_2147_83074000_rad.gif (512 × 256 pixels, file size: 3 KB, MIME type: image/gif)
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DescriptionABELL 2147 83074000 rad.gif |
English: The extraction regions were chosen based on an exposure corrected, combined GIS-2 and GIS-3 sky image. Reference sky coordinates from the literature were used as input to a centroid routine to determine the cluster center right ascension and declination. A radial emission profile was then constructed from this position. Note that this radial profile does not reflect the true cluster profile given the complicated PSF of the ASCA mirrors and the GIS detector.
The background (and sigma of the background) was iterative determined by stepping inward from the end of the profile and averaging (using a three sigma clipping algorithm). The extraction region was chosen to be the radius at which the radial profile reached 5*sigma times the background level. The radial profile is shown below. The red line is the background level. The blue line is the 5*sigma level. SIS extaction radii were set at 0.70 times the GIS extraction radius. |
Date |
before 10 December 2005 date QS:P,+2005-12-10T00:00:00Z/7,P1326,+2005-12-10T00:00:00Z/11 |
Source | http://eud.gsfc.nasa.gov/Donald.Horner/acc/html/ABELL_2147_83074000.html at the Wayback Machine |
Author | Astrophysics Science Division (ASD) at NASA/GSFC, Donald Horner |
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Public domainPublic domainfalsefalse |
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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