PHT39 (End AOT in Sparse Mapping Mode with a PHT-C Array Detector)
(July 4, 1995)
PHT39 (End AOT in Sparse Mapping Mode with a PHT-C Array 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).
* Note: you have to have PHT37 and PHT38's concatenated to this AOT; and you have to
use the same detector as in PHT37 and PHT38's, and filters belonging to the selected
detector.
==> Parameters for All Filters:
o SOURCE TYPE: P (point source) or E (extended source)
==> 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.