Time

While the most common RGB images are slices in energy, any 3 images can be combined into an RGB image.

In this example I create a 3D cube with: SKY X,Y vs. TIME.

RHO OPH CORE OBS_ID 635

download_chandra_obsid 635 evt2
dmcopy "acisf00635N004_evt2.fits.gz[x=2800:6350,y=2890:5820][bin sky=6,time=::#3]" time.cube clob+
In [1]:
cd RGB
dmlist time.cube cols
 
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Columns for Image Block EVENTS_IMAGE
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ColNo  Name                 Unit        Type             Range
   1   EVENTS_IMAGE[592,489,3]              Int2(592x489x3) -                    
 
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Physical Axis Transforms for Image Block EVENTS_IMAGE
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Group# Axis# 
   1   1,2    sky(x) = (+2799.50) +(+6.0)* ((#1)-(+0.50))
                 (y)   (+2889.50)  (+6.0)  ((#2) (+0.50))
   2   3      time                 = +72039163.853747 [s] +33992.5334 * (#3  -0.50)
 
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World Coordinate Axis Transforms for Image Block EVENTS_IMAGE
--------------------------------------------------------------------------------
 
Group# Axis# 
   1   1,2    EQPOS(RA ) = (+246.8247)[deg] +TAN[(-0.000136667)* (sky(x)-(+4096.50))]
                   (DEC)   (-24.5734 )           (+0.000136667)  (   (y) (+4096.50)) 
In [2]:
ds9 -frame delete -scale log -rgbcube time.cube &
[1] 30861
In [3]:
import -window "SAOImage ds9" ds9_05_rgb_04.png 
display < ds9_05_rgb_04.png

In [4]:
xpaset -p ds9 quit
[1]+  Done                    ds9 -frame delete -scale log -rgbcube time.cube
In [ ]: