Description Parameter: Sections 4.5.1, 5.2.5 and 5.3 Processing Level: AAR Usage in processing: Section 8.4.7 File Type: Binary FITS Table File Names: PPOMEGA, PC1OMEGA, PC2OMEGA
In the conversion from flux per pixel or per aperture (in Jy/beam) to surface
brightness (in MJy/sr) the effective solid angles
are
required. In the present set of Cal-G files, the effective solid angles were
obtained from a model calculation which takes into account the ISO primary
mirror, secondary mirror, tripod, and the linear sizes of the apertures and
the detectors as measured pre-flight.
The Cal-G files also contain the dimensions of the apertures (in case of P1, P2, and P3) or the offsets and dimensions of the detector pixels (in case of C100 and C200) as projected on the sky in arcseconds. Fields for the uncertainties of all parameters are included.
The Cal-G files related contain the following limitations:
In case the PHT-P aperture areas (in mm
) are required, OLP uses a
hardcoded list of aperture versus focal plane area (parameter 
in Section 5.2.5 and in Section 7.10.3).
The values of the areas are listed in Section A.1.2.
Binary FITS table with record length 32. The record fields are:
Field Offset Number Type Description PPOMFILT 0 1 I*4 Filter (CHW position) PPOMAPER 4 1 I*4 Aperture (CHW position) PPOMDASY 8 1 R*4 Aperture diameter in Y in arcsec PPOMDAYU 12 1 R*4 Uncertainty in aperture diameter in Y in arcsec PPOMDASZ 16 1 R*4 Aperture diameter in Z in arcsec PPOMDAZU 20 1 R*4 Uncertainty in aperture diameter in Z in arcsec PPOMOMEG 24 1 R*4 Effective Omega (insr) PPOMOMUN 28 1 R*4 Uncertainty in Omega (in
Binary FITS table with record length 48. The record fields are:
Field Offset Number Type Description PC1OMFIL 0 1 I*4 Filter (CHW position) PC1OMPIX 4 1 I*4 Pixel in SPD order PC1OMOFY 8 1 R*4 Offset in y relative to centre of array in arcsec PC1OMOYU 12 1 R*4 Uncertainty in offset in y in arcsec PC1OMOFZ 16 1 R*4 Offset in z relative to centre of array in arcsec PC1OMOZU 20 1 R*4 Uncertainty in offset in Z in arcsec PC1OMDAY 24 1 R*4 Aperture dimension y in arcsec PC1OMDYU 28 1 R*4 Uncertainty in aperture dimension y in arcsec PC1OMDAZ 32 1 R*4 Aperture dimension z in arcsec PC1OMDZU 36 1 R*4 Uncertainty in aperture dimension z in arcsec PC1OMOME 40 1 R*4 Effective Omega (in
Same file and record structure as PC1OMEGA (Section 14.21.2), however all keywords start with `PC2' instead of PC1.