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  • 21 Aug, 2019

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File:ABELL 2147 83074000 Rad.gif
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

Licensing

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.)
Warnings:

Captions

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.

Items portrayed in this file

depicts

star cluster

media type

image/gif

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