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The best conversion factors between instrumental units and MJy/sr to use
for any given data set are included within the headers of the data
themselves; grep on BUNIT and FLUXCONV. As of this writing, the best
conversion factors are listed in the Table below. The MIPS-24 instrumental
units are DN/s, but note that the instrumental MIPS-Ge units are
dimensionless after the stimflash response calibration.
Uncertainties in the conversion values are often limited by our
astrophysical understanding of stars in the far infrared, and thus the
uncertainties are likely to decrease with time.
The conversion factor at 24 microns was derived from 3 sec exposures. The
difference in the conversion factor for scan mode and 10 and 30 sec
exposures is under study, but should not be more than 3-8% different.
Table: S13 conversion from instrumental units to MJy/sr.
| Array | Conversion factor | Uncertainty |
|---|
| 24 | 0.0447 | 4% |
| 70 | 702 | 7% |
| 70 fine scale | 2808 | 15% |
| SED | 20572.7 | 10% |
| 160 | 44.7 | 12% |
Prior to S13 (all campaigns after Jan 2006; reprocessing of the
entire archive began in early 2006 as well), the table below contains
the calibration factors that were used.
Table: S10 conversion from instrumental units to MJy/sr.
| Array | Conversion factor | Uncertainty |
|---|
| 24 | 0.04391 | 10% |
| 70 | 634 | 20% |
| 160 | 42 | 20% |
For more information, see the MIPS Data Handbook
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