Figure 1: 160µm image of HD 131873.
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The data were reduced with version 2.41 of the MIPS DAT. The non-default parameters used included turning off the correction for electronic nonlinearity, specifying the dark and illumination correction for this campaign, and specifying the 160µm parameter file. The data were combined using mips_enhancer, turning off rotation and subpixel sampling, rejecting the first DCE after each stimflash, and changing the rejection threshold using "-t 5".
The mosaicked image is shown in Figure 1. The elongation of the image is apparently due in part to the behavior of the filter leak as a function of position on the array, as discussed in more detail in the analysis writeup of this task in campaign R. Note that this target saturates the center pixel of the PSF.
Figure 1: 160µm image of HD
131873.
Photometry was done with a private IDL program, and its results were
often checked against the APPHOT program in IRAF. The parameters used were an
aperture radius of 3 pixels and a sky annulus of 4-8 pixels. The aperture
correction was determined to be 1.47 based on a STinyTim PSF.
The measured photometry can be found in the table below. Note that the
measurements are made on data calibrated by dividing by a stimflash, and so
the "MIPS160 Unit" refers to a ratio of the sky image to the
stimflash.
Results
|
Photometry |
||||||
| Target | Predicted Flux | Predicted Sky | Measured Flux | Measured Sky | Calibration Factor | Integration Time |
| |
(Jy) | (MJy/sr) | (MIPS160 Unit) | (MIPS160 Unit) | (MIPS160/Jy) | (s) |
| HD131873 | 0.656 | 4.6 | 20.1±0.2 | 0.23±0.02 | 30.6±0.3 | 36 |
The target was observed successfully and good S/N obtained, but the data are not yet useful for calibration due to the filter leak.
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