PHT17 (Start AOT in Sparse Mapping Mode with a PHT-P Detector)
(July 4, 1995)
PHT17 (Start AOT in Sparse Mapping Mode with a PHT-P Detector)
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Prior to your visit at IPAC, for each target, please prepare the following parameters for
entry into the PGA:
==> Common Data for All AOTs (explained on a separate sheet).
* Only one aperture, one detector and filters belonging to that detector should be used
for all AOTs in a single sparse mapping chain (ie. PHT17, PHT18's and PHT19). High
Precision Pointing (HPP) will be engaged for PHT17, PHT18 and PHT19. Chopping is
not allowed here. At least one of your AOTs should provide the sky measurement.
Also note that the selected detector is always switched on during the mapping.
==> Parameters for All Filters:
o SOURCE TYPE: P (point source) or E (extended source)
o APERTURE: Select one from the on-screen list (cf. ISOPHOT manual).
==> Parameters for Each Individual Filter:
o FILTER: Select one from the on-screen list (cf. ISOPHOT manual).
o SOURCE FLUX DENSITY: Jy for a point source or MJy/sr for an extended source.
* UNCERTAINTY IN SOURCE FLUX DENSITY: Jy (point source) or MJy/sr (extended source).
Notes: this quantity determines the maximum expected source flux in the quantity
[(SOURCE_FLUX_DENSITY + UNCERTAINTY_IN_SOURCE_FLUX_DENSITY) + (MAX_BACKGROUND_
FLUX_DENSITY)], to be used in setting the detector dynamic range. Values up to 10
times the SOURCE FLUX DENSITY are allowed.
o MAXIMUM BACKGROUND FLUX DENSITY: In units of MJy/sr. If you have a background
dominated case, an accurate or conservative estimate of this parameter is more
important than the UNCERTAINTY IN SOURCE FLUX DENSITY.
* S/N: Leave 0.0 if you want to enter the INTEGRATION TIME below or enter the requested
minimum signal-to-noise ratio.
* INTEGRATION TIME: Leave 0.0 if you have requested a minimum S/N ratio or enter the
requested minimum on-source integration time in power of 2 in seconds. Note: if
you input a non-power of 2, it will be rounded up (e.g., 129 -> 256). Also,
because of the detector drift effect, a minimum (on-source) integration of 32 sec
is recommended to achieve a 5% accuracy in the relative flux calibration. But
if you have more or less uniform surface brightness distribution in the mapped
area, a shorter integration time can be used.