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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 5sigma times the background level. The radial profile is shown below. The red line is the background level. The blue line is the 5sigma 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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Abell 2147

File:ABELL 2147 83074000 rad.gif

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star cluster

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