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Up: 12 Product Descriptions
Previous: 12.3 SPD product types
The AAR products represent fully processed data, therefore each AAR product reflects not only the PHT subinstrument used but also the mode of operation. The definition of products necessarily involves a compromise between a number of conflicting desires. The naming convention for PHT Auto-Analysis products is to use the product type PdAt, where:
The following table summarises the products that are associated with each AOT:
| PHT03 | PPAP, PPAE, PPAS, PGAI, PGAU, PGAT |
| PHT04 | PPAP, PPAE |
| PHT05 | PPAP, PPAE |
| PHT17/18/19 | PPAP, PPAE |
| PHT22 | PCAP, PCAE, PCAS, PGAI, PGAU, PGAT |
| PHT25 | PCAP, PCAE |
| PHT32 | PCAS, PGAI, PGAU, PGAT |
| PHT37/38/39 | PCAP, PCAE |
| PHT40 | PSAP, PSAE, PLAP, PLAE, PPAS, PLAS |
PPAP is the standard product for PHT-P photometry AOTs when observing a point source. It contains the flux densities for each of the filters and/or apertures used.
Origin: PHT03, PHT04, PHT05, PHT17, PHT18, PHT19
Units: Jy
Format: FITS binary table file
Limitations: No colour correction performed
Photometry from chopped observations is not scientifically
validated
HEADER
The following product specific header keywords are present:
FIELD T Description Comment FILTERn C Filter LAMBDAn C Central wavelength EXFLUXn R Expected source flux (Jy) AOT input parameter UNCFLXn R Uncertainty (Jy) AOT input parameter MXBACKn R Expected Maximum background (MJy/sr) AOT input parameter APERn C Aperture SOURCEn R Flux density of source (Jy) only if chopped mode used SOURCUn R uncertainty (Jy) only if chopped mode used SBACKn R Flux density of source plus background (Jy) SBACKUn R Uncertainty (Jy) BACKn R Measured background intensity (MJy/sr) value = 0 if staring measurement
RECORD
Record length: 64
FIELD Off N T Description Comment PPAPFILT 0 1 I*4 Filter ID (CHW3 position) PPAPAPER 4 1 I*4 Aperture ID (CHW2 position) PPAPNBCK 8 1 I*4 Number of background reference positions PPAPSRCE 12 1 R*4 Source flux (Jy) PPAPSRCU 16 1 R*4 Uncertainty (Jy) PPAPBACK 20 1 R*4 Background for given aperture (Jy) PPAPBCKU 24 1 R*4 Uncertainty (Jy) PPAPSPB 28 1 R*4 Source plus background (Jy) PPAPSPBU 32 1 R*4 Uncertainty (Jy) PPAPBCK1 36 1 R*4 Background reference 1 (Jy) PPAPBK1U 40 1 R*4 Uncertainty (Jy) PPAPBCK2 44 1 R*4 Background reference 2 (Jy) PPAPBK2U 48 1 R*4 Uncertainty (Jy) PPAPBINT 52 1 R*4 Mean background intensity (MJy/sr) PPAPBINU 56 1 R*4 Uncertainty (MJy/sr) PPAPNCYC 60 1 I*4 Number of accepted chopper cycles
PPAE is the standard product for PHT-P photometry AOTs when observing an extended source. It contains the surface brightness for each of the filters and/or apertures used.
Origin: PHT03, PHT04, PHT05, PHT17, PHT18, PHT19
Units: MJy/sr
Format: FITS binary table file
Limitations: No colour correction performed
Surface brightness for non-standard apertures is not
scientifically validated
Photometry from chopped observations is not scientifically
validated
HEADER
The following product specific header keywords are present:
FIELD T Description Comment FILTERn C Filter (n is the record number). LAMBDAn C Central wavelength (n is the record number) EXBRGTn R Expected source brightness (MJy/sr) AOT input parameter UNCFLXn R Uncertainty (MJy/sr) AOT input parameter MXBACKn R Expected Maximum background (MJy/sr) AOT input parameter APERn C Aperture SBRGTn R Brightness of source(MJy/sr) only if chopped mode used SBRGTUn R Uncertainty (MJy/sr) only if chopped mode used SBBRGTn R Brightness of source plus background (MJy/sr) SBBRGTUn R Uncertainty (MJy/sr) BACKn R Measured background intensity (MJy/sr) value=0 if staring measurement
RECORD
Record length: 56
FIELD Off N T Description Comment PPAEFILT 0 1 I*4 Filter ID (CHW3 position) PPAEAPER 4 1 I*4 Aperture ID (CHW2 position) PPAENBCK 8 1 I*4 Number of background reference positions PPAESRCE 12 1 R*4 Source brightness (MJy/sr) PPAESRCU 16 1 R*4 Uncertainty (MJy/sr) PPAEBACK 20 1 R*4 Background for given aperture (MJy/sr) PPAEBCKU 24 1 R*4 Uncertainty (MJy/sr) PPAESPB 28 1 R*4 Source plus background (MJy/sr) PPAESPBU 32 1 R*4 Uncertainty (MJy/sr) PPAEBCK1 36 1 R*4 Background reference 1 (MJy/sr) PPAEBK1U 40 1 R*4 Uncertainty (MJy/sr) PPAEBCK2 44 1 R*4 Background reference 2 (MJy/sr) PPAEBK2U 48 1 R*4 Uncertainty (MJy/sr) PPAENCYC 52 1 I*4 Number of accepted chopper cycles
PCAP is the standard product for PHT-C photometry AOTs when observing a point source. It contains the flux densities for each of the filters used.
Origin: PHT22, PHT25, PHT37, PHT38, PHT39
Units: Jy
Format: FITS binary table file
Limitations: No colour correction performed
Photometry from chopped observations is not scientifically
validated.
HEADER
The following product specific header keywords are present:
FIELD T Description Comment FILTERn C Filter (n is the record number). LAMBDAn C Central wavelength EXFLUXn R Expected source flux (Jy) AOT input parameter UNCFLXn R Uncertainty (Jy) AOT input parameter MXBACKn R Expected Maximum background (MJy/ster) AOT input parameter SOURCEn R Flux density of source (Jy) only if chopped mode used SOURCUn R Uncertainty (Jy) only if chopped mode used SBACKn R Flux density of source plus background (Jy) SBACKUn R Uncertainty (Jy) SBACKn R Measured background (MJy/ster) value=0 if staring measurement
RECORD
Record length: 56
FIELD Off N T Description Comment PCAPFILT 0 1 I*4 Filter ID (CHW2 position) PCAPNBCK 4 1 I*4 Number of background reference positions PCAPNPIX 8 1 I*4 Number of pixels defined PCAPSRCE 12 9 R*4 Source flux (Jy) PCAPSRCU 48 9 R*4 Uncertainty (Jy) PCAPSPB 84 9 R*4 Source plus background (Jy) PCAPSPBU 120 9 R*4 Uncertainty (Jy) PCAPB1 156 9 R*4 Background at off position 1 (MJy/sr) PCAPB1U 192 9 R*4 Uncertainty (MJy/sr) PCAPB2U 264 9 R*4 Uncertainty (MJy/sr) PCAPPEAK 300 1 R*4 Fitted source peak (Jy) from Gaussian fitting PCAPPKU 304 1 R*4 Uncertainty (Jy) PCAPBCKS 308 1 R*4 Background at source position (Jy) PCAPBKSU 312 1 R*4 Uncertainty (Jy) PCAPBCK1 316 1 R*4 Avg. Background at off position 1 (Jy) PCAPBK1U 320 1 R*4 Uncertainty (Jy) PCAPBCK2 324 1 R*4 Avg. Background at off position 2 (Jy) PCAPBK2U 328 1 R*4 Uncertainty (Jy) PCAPBINS 332 1 R*4 On-source background intensity (MJy/sr) PCAPBISU 336 1 R*4 Uncertainty (MJy/sr) PCAPBIN1 340 1 R*4 Off-source background intensity 1 (MJy/sr) PCAPBI1U 344 1 R*4 Uncertainty (MJy/sr) PCAPBIN2 348 1 R*4 Off-source background intensity 2 (MJy/sr) PCAPBI2U 352 1 R*4 Uncertainty (MJy/sr) PCAPOFF 356 2 R*4 (x,y) offset of source peak (arcsec) see section 8.4.8.2- PCAPOFFU 364 2 R*4 (x,y) uncertainty in offset (arcsec) -for gaussian fit PCAPFITU 372 1 R*4 Uncertainty of Gaussian fit (Jy) PCAPSTAT 376 1 I*4 Fit status PCAPNCYC 380 9 I*4 Number of accepted chopper cycles
PCAE is the standard product for PHT-C photometry AOTs when observing an extended source. It contains the surface brightness for each of the filters used.
Origin: PHT22, PHT25, PHT37, PHT38, PHT39
Units: MJy/sr
Format: FITS binary table file
Limitations: No colour correction performed
Photometry from chopped observations is not scientifically
validated
HEADER
The following product specific header keywords are present:
FIELD T Description Comment FILTERn C Filter (n is the record number) LAMBDAn C Central wavelength (n is the record number) EXBRGTn R Expected source brightness (MJy/sr) AOT input parameter UNCFLXn R Uncertainty (MJy/sr) AOT input parameter MXBACKn R Expected Maximum background (MJy/sr) AOT input parameter SBRGTn R Brightness of source (MJy/sr) only if chopped mode used SBRGTUn R Uncertainty (MJy/sr) only if chopped mode used SBBRGTn R Brightness of source plus background (MJy/sr) SBBRGTUn R Uncertainty (MJy/sr) BACKn R Measured background intensity (MJy/sr)
RECORD
Record length: 360
FIELD Off N T Description Comment PCAEFILT 0 1 I*4 Filter ID (CHW2 position) PCAENBCK 4 1 I*4 Number of background reference positions PCAENPIX 8 1 I*4 Number of pixels defined PCAESRCE 12 9 R*4 Source brightness (MJy/sr) PCAESRCU 48 9 R*4 Uncertainty (MJy/sr) PCAESPB 84 9 R*4 Source plus background (MJy/sr) PCAESPBU 120 9 R*4 Uncertainty (MJy/sr) PCAEB1 156 9 R*4 Background reference 1 (MJy/sr) PCAEB1U 192 9 R*4 Uncertainty (MJy/sr) PCAEB2 228 9 R*4 Background reference 2 (MJy/sr) PCAEB2U 264 9 R*4 Uncertainty (MJy/sr) PCAEBACK 300 1 R*4 Average background (MJy/sr) PCAEBCKU 304 1 R*4 Uncertainty (MJy/sr) PCAEBCK1 308 1 R*4 Avg. background at off position 1 (MJy/sr) PCAEBK1U 312 1 R*4 Uncertainty (MJy/sr) PCAEBCK2 316 1 R*4 Avg. background at off position 2 (MJy/sr) PCAEBK2U 320 1 R*4 Uncertainty (MJy/sr) PCAENCYC 324 9 I*4 Number of accepted chopper cycles
PGAI is the standard product for a photometric image. It contains a map of surface brightness.
Origin: PHT03, PHT22, PHT32 Units: MJy/sr Format: FITS Image Limitations: Maps are not scientifically validated
HEADER
The following product specific header keywords are present:
FIELD T Description Comment NAXIS 3 number of axes NAXIS1 I Number of pixels per row of image NAXIS2 I Number of pixels per column of image NAXIS3 I Number of measurements (wavelengths) BUNIT C MJy/sr CTYPE1 C Right Ascension CTYPE2 C Declination CTYPE3 C wavelength BLANK I Blank value value used: -987654322 CRPIX1 R Pixel origin of RA-axis image centre CRPIX2 R Pixel origin of DEC-axis image centre CRPIX2 R n/a CRVAL1 R Right Ascension of raster centre CRVAL2 R Declination of raster centre CRVAL3 R Wavelength index CDELT1 R Pixel size (deg) CDELT2 R Pixel size (deg) CDELT3 R Index CROTA1 R Position angle of first axis (=0) CROTA2 R Position angle of second axis (=0) CROTA3 R n/a APERTURE C Aperture (if PHT-P) FILTERn C Filter n=number of filters LAMBDAn C Central Wavelength of filter (m) EXPUNCn R Expected maximum brightness (MJy/sr) AOT input parameter DATAMINn R Minimum brightness (MJy/sr) for first filter DATAMAXn R Maximum brightness (MJy/sr) for first filter
Caveat: In case an observer has selected in a multi-filter raster map PHT-03 different aperture sizes, the OLP Version 7 software does not recognize this. It assumes that there was only one single aperture size used for all filters and computes the maps accordingly with the wrong scaling. The header keywords do not reflect the filter dependent aperture size either.
IMAGE
AXIS no LENGTH Description Comment 1 N1 Points per raster line 2 N2 Number of lines 3 N3 Filters detector
PGAU is an accompanying product for a photometric image. It contains a map of uncertainty in the surface brightness as found in product PGAI.
Origin: PHT03, PHT22, PHT32 Units: MJy/sr Format: primary FITS file containing a real array Limitations: Maps are not scientifically validated
The product specific header keywords and image axis are the same as for PGAI, except for:
FIELD T Description Comment DATAMIN R Minimum uncertainty for first filter DATAMAX R Maximum uncertainty for first filter
This is an accompanying product for a photometric image. It contains a map of the exposure time as measured in product PGAI.
Origin: PHT03, PHT22, PHT32. Units: Seconds Format: primary FITS file containing a real array Limitations: Maps are not scientifically validated
HEADER
The product specific header keywords and image axis
are the same as for PGAI, except for:
FIELD T Description Comment DATAMIN R Minimum exposure for first filter DATAMAX R Maximum exposure for first filter DATAAVG R Average exposure for first filter
This is the photometric table product for PHT-P raster maps. The data serve as input for alternative image reconstruction algorithms. Each record contains the surface brightness and sky coordinates for each sampled position. The records are ordered in time according to the raster scan, records of a next filter are appended to the ones of the previous.
Origin: PHT03
Units: MJy/sr
Format: FITS binary table file
Limitations: Uncertainties in coordinates are currently not available
Maps are not scientifically validated
HEADER
The following product specific header keywords are present:
FIELD T Description Comment FILTERn C Filter identifier LAMBDAn C Reference Wavelength of filter (m) EXFLUXn R Expected source brightness (MJy/sr) AOT input parameter UNCFLXn R Uncertainty (MJy/sr) AOT input parameter MXBACKn R Max.expected background (MJy/sr) AOT input parameter MXBRGTn R Measured maximum brightness (MJy/sr) UNBRGTn R Uncertainty (MJy/sr)
RECORD
Record length: 40 bytes
FIELD Off N T Description Comment PPASFILT 0 1 I*4 Filter ID (CHW3 position) PPASRA 4 1 R*4 Right Ascension PPASRAU 8 1 R*4 Uncertainty PPASDEC 12 1 R*4 Declination PPASDECU 16 1 R*4 Uncertainty PPASROLL 20 1 R*4 Roll angle PPASROLU 24 1 R*4 Uncertainty PPASBRGT 28 1 R*4 Surface brightness (MJy/sr) PPASBRGU 32 1 R*4 Uncertainty (MJy/sr) PPASSTAT 36 1 I*1 Status flag (from SPD) PPASFILL 37 3 I*1 Filler
This is the photometric table product for PHT-C raster maps. The data serve as input for alternative image reconstruction algorithms. Each record contains the surface brightness and sky coordinates for each sampled position. The records are ordered in time according to the raster scan, records of a next filter are appended to the ones of the previous. For PHT32 observations each record contains data of a chopper plateau.
Origin: PHT22, PHT32
Units: MJy/sr
Format: FITS binary table file
Limitations: Uncertainties in coordinates are currently not available
Maps are not scientifically validated
HEADER
The following product specific keywords are present:
FPCMODE C Chopper mode (ST= staring, RE= rectangular, SW= sawtooth, TR= triangular FILTERn C Filter identifier see A.1 LAMBDAn C Reference Wavelength of filter (m) EXFLUXn R Expected source brightness (MJy/sr) AOT input parameter UNCFLXn R Uncertainty (MJy/sr) AOT input parameter MXBACKn R Max. expected background (MJy/sr) AOT input parameter MXBRGTn R Measured maximum brightness (MJy/sr) UNBRGTn R Uncertainty (MJy/sr)
RECORD
Record length: 120 bytes
FIELD Off N T Description Comment PCASFILT 0 1 I*4 Filter ID (CHW2 position) PCASRA 4 1 R*4 Right Ascension PCASRAU 8 1 R*4 Uncertainty PCASDEC 12 1 R*4 Declination PCASDECU 16 1 R*4 Uncertainty PCASROLL 20 1 R*4 Roll angle PCASROLU 24 1 R*4 Uncertainty PCASAVGB 28 1 R*4 Average brightness over array (MJy/sr) PCASNPIX 32 1 I*4 Number of pixels defined PCASBRGT 36 9 R*4 Surface brightness (MJy/sr) PCASBRGU 72 9 R*4 Uncertainty (MJy/sr) PCASSTAT 108 9 I*1 Status flags from SPD PCASFILL 117 3 I*1 Filler
This is the photometric table product for PHT-SS single pointing of a point source.
Origin: PHT40 Units: W/m^2/micron Format: FITS binary table file Limitations: -
HEADER
The following product specific keywords are present:
CALSEQ I Calibration Sequence CALDATE C Date Calibration defaults generated FPCMODE C Focal plane chopper mode (ST, RE, SW or TR) LAMBDAd R Central Wavelength of pixel (m) d=1,2,...,64
RECORD
Record length: 2568 bytes
FIELD Off N T Description Comment PSAPDFLG 0 1 I*4 Dark background flag dark=1, otherwise=0 PSAPNBCK 4 1 I*4 Number of background reference positions PSAPSRCE 8 64 R*4 Source Flux inPSAPSRCU 264 64 R*4 Uncertainty in
This is the photometric table product for PHT-SL single pointing of a point source.
Origin: PHT40 Units: W/m^2/micron Format: FITS binary table file Limitations: -
HEADER
Similar to product PSAP
RECORD
Similar to product PSAP, only all record keywords start with `PLAP'
This is the photometric table product for PHT-SS single pointing of an extended source.
Origin: PHT40 Units: of W/m^2/micron/sr Format: FITS binary table file Limitations: -
HEADER
Similar to product PSAP
RECORD
Similar to product PSAP, only all record keywords start with `PSAE' and
all surface brightness values are in units of W/m2/
m/sr.
This is the photometric table product for PHT-SL single pointing of an extended source.
Origin: PHT40 Units: W/m^2/micron/sr Format: FITS binary table file Limitations: -
HEADER
Similar to product PSAP
RECORD
Similar to product PSAP, only all record keywords start with `PLAE' and
all surface brightness values are in units of W/m2/m/sr.
This is the photometric table product for PHT-SS raster pointing. Each record contains the surface brightness and sky coordinates for each sampled position. The records are ordered in time according to the raster scan.
Origin: PHT40 Units: W/m^2/micron/sr Format: FITS binary table file Limitations: -
HEADER
The following product specific keywords are present:
CALSEQ I Calibration Sequence CALDATE C Date Calibration defaults generated LAMBDAd R Central Wavelength of pixel (m) d=1,64
RECORD
Record length: 604 bytes
FIELD Off N T Description Comment PSASDFLG 0 1 I*4 Dark background flag dark=1, otherwise=0 PSASRA 4 1 R*4 Right Ascension of raster point PSASRAU 8 1 R*4 Uncertainty in Right Ascension PSASDEC 12 1 R*4 Declination of raster point PSASDECU 16 1 R*4 Uncertainty in Declination PSASROLL 20 1 R*4 Roll angle PSASROLU 24 1 R*4 Uncertainty in roll angle PSASSPB 28 64 R*4 Source plus background inPSASSPBU 284 64 R*4 Uncertainty in
This is the photometric table product for PHT-SL raster pointing.
Origin: PHT40 Units: W/m^2/micron/sr Format: FITS binary table file Limitations: No image product available
HEADER
Similar to product PSAS
RECORD
Similar to product PSAP, only all record keywords start with `PLAS'
ISOPHOT Data Users Manual, Version 4.1, SAI/95-220/Dc