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Principal:
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Analyst:
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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 1.5e5 DN/s/Jy and is well-matched to previous calibration measurements within the uncertainties. The pointing reconstruction is now present for all images.

Analysis

The data were processed with version 2.21 of the DAT, using the campaign G dark and flat images. 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. The data were coadded to make a mosaic, which was examined for background sources or other problems which would bias the flux measurement.

Results

Data Collected

As expected, this task generated a total of 30 Si:As DCEs on the star and 10 more in the stim IER. A software error ("Problem with averaging the Subpixel fluxes") with mips_enhancer prevented me from making an enhanced mosaic with this data set, so no mosaic is shown here. I assume the software message is due to user error, but I do not know the cause. The IRAF mosaic does not reveal any problems with the data set, so I have chosen to proceed.

System Throughput

I computed the total counts from the star in all 30 DCEs, using an aperture 6 pixels in radius and a sky annulus 12 to 16 pixels in radius in IRAF's "imexam" task. The counts are 6.926e+04 ± 1.162e+03 (1.7%) DN/s (ignoring the boost DCEs), and the distribution is shown in Figure 1. The median counts in the sky annuli are 3.536e+02 ± 1.940e+00 (0.5%) DN/s. I continue to apply the aperture correction of 1.15. The flux for the target star (HD159330) is 0.54 Jy at 24µm, so the ratio of DN/s to Jy is 6.926e4 * 1.15 / 0.54 = 1.47e5. This conversion factor is very similar to that measured for this star during other campaigns. The implied background level is 3.536e+02 DN/s / 1.47e5 DN/s/Jy * 1e-6 MJy/Jy / (2.47/206265)² sr/pix = 16.8 MJy/sr.

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

Stimulator

The stimulator IER behaved as expected, producing 3 dark DCEs followed by 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. The stimulator images were averaged and the mean data value in the stimulator image (ignoring values below 100 DN/s, which are all bad pixels) is 3168 DN/s, similar to values measured in earlier campaigns.

Conclusions

The 24µm flux calibration continues to be stable.
The pointing reconstruction is now present for all images.

Output and Deliverable Products

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