ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

258 CHAPTER 20. ADVANCED DATA CALIBRATION
• If you believe your source has a blackbody spectrum then you just need to supply the
blackbody temperature:
CIA> corr_colour, "lw10", bb=5000
filter ok: LW10
=====================================
Filter
= LW10
ref wavelength = 12.0000
correction factor K at ref wave = 1.27288
by which you should divide the ISOCAM flux, to
obtain the actual flux density of your source
In this case one would correct all flux density measurements of this source by dividing by
the correction factor 1.27288.
• If your source has a power law spectrum then simply supply the power law exponent:
CIA> corr_colour, "lw10", power=-2
• Finally, if you have constructed a SED (possibly from CAM measurements in different
filters or from modem calculation) you can use it as input to corr colour. The SED data
points must be first written to a text file in a simple two column format, with wavelength
(microns) in the first column and flux density (Jy) in the second. This name of this text
is supplied as input to corr colour:
CIA> $more sed.dat
2.38014 440.23920
2.38163 429.91971
2.38311 421.62091
2.38460 419.00839
2.38610 424.57556
2.38759 436.57462
etc...
CIA> corr_colour, "lw10", sed="sed.dat"
20.14 A note on the infamous column 24
At this stage you should be very familiar with the LW detector’s dead column 24 (or by IDL
convention column 23). By default most CIA processing will attempt to interpolate column 24
so that it is no longer appears in the reduced data. Not all observers will desire this. To avoid
any filling of column 24 use the keyword /dead col. The routines that accept this keyword are:
• By default get sscdstruct, get sscdbs, get sscdraster and get sscdcvf will fill column
24 in the output PDS field .CUBE. with the average of its neighboring columns. If
/dead col is set then column 24 is set to zero.