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The OLP Version 7 validation status per AOT submode is given in Table 9.1. The table also provides an overview of the next steps to further upgrade both validated and non-validated modes and for which OLP version improvements can be expected.
It should be noted that in the case of AOT PHT22 raster maps are only partly scientifically validated. It has been demonstrated that mini-maps give reliable results for faint source photometry. Most of the photometric accuracy numbers presented for faint source measurements of C100 and C200 are based on mini-map photometry. However, in order to validate PHT22 raster maps in general, the following items must be verified before:
These checks are less related to calibration upgrades but more to the establishment of a sufficiently large test data set and inspection of the observations case by case.
AOT | submode | scientifically | next upgrades | foreseen in |
---|---|---|---|---|
valid since | OLP Vx.y | |||
PHT03 | staring point source | V6 | non-lin R & FCS aper | 8.2 |
staring extended source | no | beam | 8.2 | |
nodding | V6 | non-lin R & FCS aper | 8.2 | |
chopped point source | no | chop | 8.2 | |
raster map | no | map cal & drift | 8.2/9.2 | |
PHT04 | staring point source | no | beam & FCS aper | 8.2 |
staring extended source | no | beam | 8.2 | |
chopped point source | no | chop & beam | 8.2 | |
PHT05 | staring point source | V6 | FCS aper | 8.2 |
staring extended source | no | beam | 8.2 | |
PHT17 | staring point source | V6 | non-lin R & FCS aper | 8.2 |
18,19 | staring extended source | no | beam | 8.2 |
PHT22 | staring point source | V7 | non-lin R | 8.2 |
staring extended source | V7 | non-lin R | 8.2 | |
nodding | V7 | non-lin R | 8.2 | |
chopped point source | no | chop | 8.2 | |
raster map | no | map cal & flat-field | 9.2 | |
PHT25 | staring point source | V7 | ||
staring extended source | V7 | |||
PHT32 | chopped mapping | no | chop & map cal | 9.2 |
PHT37 | staring point source | V7 | non-lin R | 8.2 |
38,39 | staring extended source | V7 | non-lin R | 8.2 |
PHT40 | staring point source | V5 | ||
staring extended source | V6 | beam | 8.2 | |
chopped point source | V6 |
In Table 9.2 we list the validated modes per detector sub-system. For completeness we have added the polarisation modes which can only be evaluated interactively using PIA and special FORTRAN routines.
det. | scientifically validated mode | AOT |
---|---|---|
P1 | absolute photometry point sources | PHT05 |
staring multi-filter photometry point sources | PHT03 | |
faint source multi-filter nodding | PHT03 | |
multi-filter sparse map point sources | PHT17/18/19 | |
P2 | absolute photometry point sources | PHT05 |
staring multi-filter photometry point sources | PHT03 | |
faint source multi-filter nodding | PHT03 | |
multi-filter sparse map point sources | PHT17/18/19 | |
polarimetry (PIA) | PHT50 | |
P3 | absolute photometry point sources | PHT05 |
staring multi-filter photometry point sources | PHT03 | |
faint source multi-filter nodding | PHT03 | |
multi-filter sparse map point sources | PHT17/18/19 | |
C100 | absolute photometry point sources | PHT25 |
absolute photometry extended sources | PHT25 | |
staring multi-filter photometry point sources | PHT22 | |
staring multi-filter extended sources | PHT22 | |
faint source multi-filter nodding | PHT22 | |
multi-filter sparse map | PHT37/38/39 | |
C200 | absolute photometry point sources | PHT25 |
absolute photometry extended sources | PHT25 | |
staring multi-filter photometry point sources | PHT22 | |
staring multi-filter extended sources | PHT22 | |
faint source multi-filter nodding | PHT22 | |
multi-filter sparse map | PHT37/38/39 | |
polarimetry (PIA) | PHT51 | |
SS/SL | staring point source spectroscopy | PHT40 |
extended source spectroscopy | PHT40 | |
chopped point source spectroscopy | PHT40 |
The terms absolute accuracy, relative accuracy and reproducibility have been defined in the following context:
In summary, the following calibration accuracies have been achieved per
detector:
The relative reproducibility accuracy is 5% for bright sources and
10% for faint sources.
The relative reproducibility accuracy is 2% for bright sources and
12% for faint sources.
0.5 Jy. For fainter sources the absolute accuracy is around 30%.
The relative reproducibility accuracy is 7% for bright sources and
7% for faint sources. Under extreme Space Weather conditions and for
the very end of the science window the achieved accuracy for faint sources
is poorer.
0.5 Jy. For fainter fluxes the absolute accuracy in mini-map mode is
30%.
The relative reproducibility accuracy is 3% for bright sources and
20% for faint sources.
20% absolute accuracy for brighter sources. Note that in
array
centered mode accuracies are poorer for the 180 and 200
m filters
due to
an inadequate PSF correction factor. Photometry in these filters has to
be
corrected in general by 20-30% towards higher flux values. For fainter
sources (< 1 Jy) the accuracy achieved in mini-map mode is
30%.
There was no suitable test case allowing to judge the relative
filter-to-filter accuracy. The investigated test cases of standard
stars (
Boo,
Dra and Sirius) did not give conclusive results due to their
faintness in the C200 range and application of less optimal observing
modes.
The relative reproducibility accuracy is around 10% both for bright and
faint sources.
ISOPHOT Data Users Manual, Version 4.1, SAI/95-220/Dc