Shear PSF Model Image¶

Data product name¶

shePsfModelImage

Data product custodian¶

SHE

Data model tag¶

8.0

Name of the Schema file¶

ST_DM_Schema/dictionary/pro/she/euc-test-she.xsd

Schema documentation tag¶

Documentation for data product element shePsfModelImage:

This product contains the postage stamps for the PSF of the object. It has a FITS product with 3 HDUs, one containing the postage stamp of the bulge, one the postage stamp of the disk and one for a catalogue of the position, calibration and field parameters

Documentation for data product element Header:

The generic header of the product.

Data product elements¶

DataStorage (shePsfModelImageFile)

DataContainer (dss:dataContainer)

ExposureProductId (string)
ObservationId (long)

Processing Element(s) creating/using the data product¶

SHE_PSFToolkit

Processing function using the data product¶

SHE

Detailed description of the data product¶

Data product containing a per-object broadband PSF, as output of the SHE_PSFToolkit software, for a catalogue of sources.

Stores each PSF image as a FITS file containing 3 HDUs NxN array (size set by user on runtime), as well as meta-data linking to object in question. The FITS file is in an XML container, which also stores the ExposureProductID and ObservationID linking to the VIS input file that the postage stamp is created from. The pixel size is set by the user.

The FITS output file will contain the following information:

HDUs

“Primary”: Header only HDU

#. “PSFC”: Catalogue containing additional information for PSF determination for object For each PSF defined in the PSFC there are the following HDUs #. “BPSF”: Bulge PSF images (as postage stamps) #. “DPSF”: Disk PSF images (as postage stamps)

Primary¶

Header +————–+———–+——–+—————————–+ | Keyword name | Optional? | Format | Brief description | +==============+===========+========+=============================+ | FITS_VER | No | String | Table format version number | +————–+———–+——–+—————————–+ | FITS_DEF | No | String | Table format label | +————–+———–+——–+—————————–+ | EQUINOX | No | Double | | +————–+———–+——–+—————————–+ | MJD-OBS | No | Double | | +————–+———–+——–+—————————–+ | RADESYS | No | String | | +————–+———–+——–+—————————–+ | CTYPE1 | No | String | | +————–+———–+——–+—————————–+ | CUNIT1 | No | String | | +————–+———–+——–+—————————–+ | CRVAL1 | No | Double | | +————–+———–+——–+—————————–+ | CRPIX1 | No | Double | | +————–+———–+——–+—————————–+ | CD1_1 | No | Double | | +————–+———–+——–+—————————–+ | CD1_2 | No | Double | | +————–+———–+——–+—————————–+ | CTYPE2 | No | String | | +————–+———–+——–+—————————–+ | CUNIT2 | No | String | | +————–+———–+——–+—————————–+ | CRVAL2 | No | Double | | +————–+———–+——–+—————————–+ | CRPIX2 | No | Double | | +————–+———–+——–+—————————–+ | CD2_1 | No | Double | | +————–+———–+——–+—————————–+ | CD2_2 | No | Double | | +————–+———–+——–+—————————–+

PSFC¶

Data

Catalogue connecting PSF image information to requested objects.

Notes:

1 chi = (1-r^2)/(1+r^2) is the definition of ellipticity from shear measurement
2 When errors cannot be reasonably calculated, the value should be NaN

BPSF¶

(Postage Stamp) Image of PSF for bulge of object.

Header +————–+———–+———+—————————–+ | Keyword name | Optional? | Format | Brief description | +==============+===========+=========+=============================+ | FITS_VER | No | String | Table format version number | +————–+———–+———+—————————–+ | FITS_DEF | No | String | Table format label | +————–+———–+———+—————————–+ | BITPIX | No | Integer | | +————–+———–+———+—————————–+ | NAXIS | No | Integer | | +————–+———–+———+—————————–+ | NAXIS1 | No | Integer | | +————–+———–+———+—————————–+ | NAXIS2 | No | Integer | | +————–+———–+———+—————————–+ | EXTEND | No | Logical | | +————–+———–+———+—————————–+ | PIXSCALE | No | Double | | +————–+———–+———+—————————–+

Data

Data will contain an NxN image (size TBF) of floats, representing the PSF for the bulge of the object.

WcsList List of WCS RA, DEC for each WCS used.

DPSF¶

As BPSF, for the disk of the object.