Shear PSF Model Image

Metadata

Data product name	DpdShePsfModelImage
Data product custodian	SHE
Name of the Schema file	euc-she-PsfModelImage.xsd
Processing Element(s) creating/using the data product	Creators: SHE_PSFToolkit_ModelPSFs Consumers: SHE_LensMC_EstimateShear SHE_MetaCal_EstimateShear
Processing function using the data product	SHE
Proposed for inclusion in EAS/SAS	This product is proposed for inclusion in the SAS: no

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

1. “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

HDU PRIMARY: header
	Name	Description	Value
Keywords	FITS_VER	Table format version number	string = 8.0
	FITS_DEF	Table format label	string = she.psfModelImage
	EQUINOX		double
	MJD-OBS		double
	RADESYS		string
	CTYPE1		string
	CUNIT1		string
	CRVAL1		double
	CRPIX1		double
	CD1_1		double
	CD1_2		double
	CTYPE2		string
	CUNIT2		string
	CRVAL2		double
	CRPIX2		double
	CD2_1		double
	CD2_2		double

PSFC

A catalogue of the model PSFs contained within the product. This contains the OBJECT_ID, HDU indices of the disk and bulge PSFs, positional information for both the VIS image and the PSF cutout, and some statistical information about the PSF model.

HDU ShePsfC: header
	Name	Description	Value
Keywords	FITS_VER	Table format version number	string = 8.0
	FITS_DEF	Table format label	string = she.psfModelImage.ShePsfC
	CAL_PROD	ProductId identifying the PSF calibration data product used	string
	CAL_TIME	Timestamp identifying the PSF calibration data product used	string
	FLD_TIME	Timestamp identifying the PSF field param data product used	string
	FLD_PROD	ProductId identifying the PSF field data product used	string

HDU ShePsfC: 18 columns table
	Name	Description	Unit	Format
Columns	OBJECT_ID	Identifier for object for which PSF was requested	NA	FITS K
	SHE_PSF_SED_TEMPLATE	Identifiers for templates used in construction of the PSF	NA	FITS K
	SHE_PSF_BULGE_INDEX	Index of the HDU containing the bulge PSF iamge for this object	NA	FITS J
	SHE_PSF_DISK_INDEX	Index of the HDU containing the disk PSF iamge for this object	NA	FITS J
	SHE_PSF_IMAGE_X	X co-ordinate of the postage stamp on the exposure	NA	FITS I
	SHE_PSF_IMAGE_Y	Y co-ordinate of the postage stamp on the exposure	NA	FITS I
	SHE_PSF_X	X co-ordinate of the centre of the PSF on the postage stamp (includes sub pixel)	NA	FITS E
	SHE_PSF_Y	Y co-ordinate of the centre of the PSF on the postage stamp (includes sub pixel)	NA	FITS E
	SHE_PSF_CALIB_TIME	Timestamp identifying the PSF calibration data product used	NA	FITS 20A
	SHE_PSF_FIELD_TIME	Timestamp identifying the PSF field param data product used	NA	FITS 20A
	SHE_PSF_QUAL_FLAG	Flag indicating whether PSF is of sufficient quality for shear analysis	NA	FITS J
	SHE_PSF_CHI1_IMAGE	First moment of PSF ellipticity (using chi) in x-image coordinate / pixels	NA	FITS E
	SHE_PSF_CHI2_IMAGE	First moment of PSF ellipticity (using chi) in y-image coordinate / pixels	NA	FITS E
	SHE_PSF_R2	Quadrupole moment (Mxx|Myy) measure of PSF area / arcsec**2	NA	FITS E
	SHE_PSF_STREHL	Strehl ratio of PSF	NA	FITS E
	SHE_PSF_CHI1_IMAGE_ERR	1-sigma error on first moment of PSF ellipticity in x-image coordinate / pixels	NA	FITS E
	SHE_PSF_CHI2_IMAGE_ERR	1-sigma error on first moment of PSF ellipticity in y-image coordinate / pixels	NA	FITS E
	SHE_PSF_R2_ERR	1-sigma error on quadrupole moment measure of PSF area / arcsec**2	NA	FITS E

BPSF

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

HDU BPSF: header
	Name	Description	Value
Keywords	FITS_VER	Table format version number	string = 8.0
	FITS_DEF	Table format label	string = she.psfModelImage.BPSF
	BITPIX		integer
	NAXIS		integer
	NAXIS1		integer
	NAXIS2		integer
	EXTEND		logical
	PIXSCALE		double

HDU BPSF: 1 array info
	Format	Number of Dimensions	Unit
ArrayInfo	-32	2	NA

HDU BPSF: 2 array axes
	Name	Projection Algorithm	Type	Unit
AxesList	RA	TAN	RA	deg
	DEC	TAN	DEC	deg

DPSF

As BPSF, for the disk of the object.

HDU DPSF: header
	Name	Description	Value
Keywords	FITS_VER	Table format version number	string = 8.0
	FITS_DEF	Table format label	string = she.psfModelImage.DPSF
	BITPIX		integer
	NAXIS		integer
	NAXIS1		integer
	NAXIS2		integer
	EXTEND		logical
	PIXSCALE		double

HDU DPSF: 1 array info
	Format	Number of Dimensions	Unit
ArrayInfo	-32	2	NA

HDU DPSF: 2 array axes
	Name	Projection Algorithm	Type	Unit
AxesList	RA	TAN	RA	deg
	DEC	TAN	DEC	deg