Today I took Lee Armus's (Spitzer) suggestions about how to look for faint sources in IRS spectra (by differencing) and turned them into a simple data reduction script. They worked nicely, in that most of the detector artifacts went away, but I still don't see our galaxies! On the other hand, we don't expect the galaxies to be very bright in the mid-infrared, so maybe our observations just put upper limits? My expected brightness and sensitivity calculations (for the proposal) involved some serious guessing.
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