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Principal:
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Last Updated:

Task Outcome Summary

DATA STATUS: Nominal
TASK OUTCOME: Nominal

Abstract

This is the routine 24µm flux calibration. The target was HD159330. The calibration is 1.47e5 DN/s/Jy and is well-matched to previous calibration measurements within the uncertainties.

Analysis

The data were reprocessed with version 2.61 of the DAT, using the Flight calibration files (ver.1.6). The photometry data were flat-fileded using scan mirror dependent flats composed using the data from Campaign E to X3. A centroid measurement and aperture photometry was performed on the star in each of 30 DCEs. These data were used to derive a flux calibration.

Results

Data Collected

As expected, this task generated a total of 30 Si:As DCEs on the star and 7 more in the stim IER.

System Throughput

The total counts from the star in all 30 DCEs are computed using IDL program with the same aperture parameters as before. Details about the aperture photometry and sky background in individual DCE are available here. The average total counts are 6.927+04 ± 1.218e+03 (1.76%) DN/s (ignoring the boost DCEs), and the distribution is shown in Figure 1. Using the aperture correction of 1.146, the total counts from the target is 7.938e4 DN/s, so the ratio of DN/s to Jy is 1.47e5. This conversion factor continues to be stable.

Figure 1: Counts for HD159330 as a function of DCE number.

Stimulator

The stimulator IER behaved as expected, producing 7 images of the flat-field stimulator. The data were processed with mips_sloper in a fashion identical to that described above for the sky images. Figure 2 shows the historgram over the whole array in individual DCE. The 5-sigmaclip mean value is also listed in each DCE. (Note that 1st DCE has SUR algorithm wrong, so the statistics from DCE#1 should be ignored.)

Figure 2: Histrogram on the Stim over DCEs

Conclusions

The 24µm flux calibration continues to be stable.

Output and Deliverable Products

The flux calibration is delivered in this writeup. The calibration images and mosaic are available should they be needed.