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Up: 13 Calibration G Products
Previous: 13.15 Point spread function
Description Parameter: section 4.6.2, 5.2.4
Processing Level: AAR
Usage in processing: sections 8.4.9 and 8.4.10
File Type: Binary Fits Table
Number of Records: 128
File Names: PSPECAL
For each pixel in the PHT-SS and PHT-SL
array the corresponding central wavelengths and spectral response
are listed.
The spectral response is given in units of V/s/Jy for point sources
and in V/s/(MJy/sr) for extended sources. These numbers provide
a direct conversion from a pixel signal to a point source flux (in Jy)
or a surface brightness (in MJy/sr) on the sky. The conversion assumes
(1) a constant responsivity for the PHT-S arrays with time
and orbital position and (2) no positional
dependence of the source with respect to the centre of the aperture.
The records are filled as follows: data of PHT-SS pixels 1-64 are
stored in records 1-64, PHT-SL pixels 1-64 are stored in records 65-128.
Binary FITS table with record length 16. The record fields are:
Field Offset Number Type Description PSPELAMB 0 1 R*4 Wavelength (in m, increasing) PSPELUNC 4 1 R*4 Uncertainty in wavelength (m) PSPESRFP 8 1 R*4 Point source srf (V/s/Jy) PSPESRUP 12 1 R*4 Uncertainty point source srf (V/s/Jy) PSPESRFE 16 1 R*4 Extended source srf (V/s/(MJy/sr)) PSPESRUE 20 1 R*4 Uncertainty extended source srf (V/s/(MJy/sr))
Note:
srf=spectral response function
ISOPHOT Data Users Manual, Version 4.1, SAI/95-220/Dc