CXC Optics>Raytracing Chandra>SAOTrace>Source Definitions>Source Extent Functions>Disk Extent Function
[Last Change: 15 Feb 2012 (rev 6)]

disk Extent Function

The disk function is a simplified SAOTrace source extent interface function which simulates a circular disk with a uniform flux distribution.

disk() takes a single argument, a table, with the following recognized named entries:

name type description default
position position specification source position on optical axis
spectrum spectrum specification source spectrum  
radius angular distance (units required) disk radius  
For example,

<noautolink>disk.png</noautolink>
disk{ radius = {3,"arcsecond"},
      position = { theta = { 10, 'arcseconds' },
		   phi = { 125, 'degree' }
		},
      spectrum = { { type = "flat", emin = 0.2, emax = 10.0 } }
   }


 
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