zpix-SURVEY-PROGRAM-extra.fits

Summary:

All remaining columns from the healpix-based redshift catalogs not included in the core or imaging files, one file per SURVEY and PROGRAM. Includes full Redrock output, TSNR2 scores, emission line fits, QuasarNET results, and per-tracer quality flags.

Naming Convention:

zcatalog/v2/SURVEY/zpix-SURVEY-PROGRAM-extra.fits, where SURVEY is e.g. main or sv1 and PROGRAM is e.g. bright or dark.

Regex:

zpix-(cmx|main|sv1|sv2|sv3|special)-(backup|bright|dark|other)-extra\.fits

File Type:

FITS, ~500 MB

Contents

Number	EXTNAME	Type	Contents
HDU0	PRIMARY	IMAGE	Empty
HDU1	ZCATALOG_EXTRA	BINTABLE	All extra columns not in core or imaging files

FITS Header Units

HDU0

EXTNAME = PRIMARY

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
CHECKSUM	9aaGCVYE9aaECUYE	str	HDU checksum
DATASUM	0	str	data unit checksum
ZCATVER	v2	str	Version of zcatalog files

Empty HDU.

HDU1

EXTNAME = ZCATALOG_EXTRA

All columns not included in the core zpix-SURVEY-PROGRAM.fits or imaging zpix-SURVEY-PROGRAM-imaging.fits files. Rows are in the same order and correspond 1-to-1 with the ZCATALOG HDU.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	870	int	width of table in bytes
NAXIS2	139728	int	number of rows in table
RRVER	0.15.0	str	Redrock version
SURVEY [1]	main	str	DESI sub-survey (e.g. sv1, sv3, main)
PROGRAM [1]	dark	str	DESI program (e.g. dark, bright)
CHECKSUM	QA6lQ26iQ96iQ96i	str	HDU checksum
DATASUM	4284326946	str	data unit checksum
ZCATVER	v2	str	Version of zcatalog files

Required Data Table Columns

Name	Type	Units	Description
TARGETID	int64		Unique DESI target ID
HEALPIX [1]	int32		HEALPixel number decoded from UNIQPIX (DR3+)
NSIDE [1]	int32		HEALPix NSIDE decoded from UNIQPIX (DR3+)
SPGRPVAL	int32		Value by which spectra are grouped for a coadd (healpixel number for healpix coadds)
Z	float64		Redshift measured by Redrock
ZERR	float32		Redshift error from redrock
ZWARN	int32		Redshift warning bitmask from Redrock
CHI2	float32		Best fit chi squared
COEFF	float32[10]		Redrock template coefficients
NPIXELS	int32		Number of unmasked pixels contributing to the Redrock fit
SPECTYPE	char[6]		Spectral type of Redrock best fit template (e.g. GALAXY, QSO, STAR)
SUBTYPE	char[3]		Spectral subtype
NCOEFF	int16		Number of Redrock template coefficients
DELTACHI2	float32		chi2 difference between first- and second-best redrock template fits
COEFF_BEST	float32[10]		Redrock template coefficients for Z_BEST fit
SUBPRIORITY	float64		Random subpriority [0-1] to break assignment ties
FA_TARGET	int64		Targeting bit internally used by fiberassign (linked with FA_TYPE)
FA_TYPE	binary		Fiberassign internal target type (science, standard, sky, safe, suppsky)
OBSCONDITIONS	int16		Flag the target to be observed in graytime.
PRIORITY_INIT	int64		Target initial priority from target selection bitmasks and OBSCONDITIONS
NUMOBS_INIT	int64		Initial number of observations for target calculated across target selection bitmasks and OBSCONDITIONS
PLATE_RA	float64	deg	Barycentric Right Ascension in ICRS to be used by PlateMaker
PLATE_DEC	float64	deg	Barycentric Declination in ICRS to be used by PlateMaker
LAMBDA_REF	float32	Angstrom	Requested wavelength at which targets should be centered on fibers
DEVICE_LOC	int16		Device location on focal plane [0-523]
LOCATION	int16		Location on the focal plane PETAL_LOC*1000 + DEVICE_LOC
FITMETHOD	char[4]		Redshift fitting method (e.g. PCA)
MEAN_DELTA_X	float32	mm	Mean (over exposures) fiber difference requested - actual CS5 X location on focal plane
RMS_DELTA_X	float32	mm	RMS (over exposures) of the fiber difference between measured and requested CS5 X location on focal plane
MEAN_DELTA_Y	float32	mm	Mean (over exposures) fiber difference requested - actual CS5 Y location on focal plane
RMS_DELTA_Y	float32	mm	RMS (over exposures) of the fiber difference between measured and requested CS5 Y location on focal plane
MEAN_PSF_TO_FIBER_SPECFLUX	float32		Mean of input exposures fraction of light from point-like source captured by 1.5 arcsec diameter fiber given atmospheric seeing
MEAN_FIBER_RA	float64	deg	Mean (over exposures) RA of actual fiber position
STD_FIBER_RA	float32	arcsec	Standard deviation (over exposures) of RA of actual fiber position
MEAN_FIBER_DEC	float64	deg	Mean (over exposures) DEC of actual fiber position
STD_FIBER_DEC	float32	arcsec	Standard deviation (over exposures) of DEC of actual fiber position
MEAN_FIBER_X	float32	mm	Mean (over exposures) fiber CS5 X location on focal plane
MEAN_FIBER_Y	float32	mm	Mean (over exposures) fiber CS5 Y location on focal plane
TSNR2_GPBDARK_B	float32		template (S/N)^2 for dark targets in guider pass band on B
TSNR2_ELG_B	float32		ELG B template (S/N)^2
TSNR2_GPBBRIGHT_B	float32		template (S/N)^2 for bright targets in guider pass band on B
TSNR2_LYA_B	float32		LYA B template (S/N)^2
TSNR2_BGS_B	float32		BGS B template (S/N)^2
TSNR2_GPBBACKUP_B	float32		template (S/N)^2 for backup targets in guider pass band on B
TSNR2_QSO_B	float32		QSO B template (S/N)^2
TSNR2_LRG_B	float32		LRG B template (S/N)^2
TSNR2_GPBDARK_R	float32		template (S/N)^2 for dark targets in guider pass band on R
TSNR2_ELG_R	float32		ELG R template (S/N)^2
TSNR2_GPBBRIGHT_R	float32		template (S/N)^2 for bright targets in guider pass band on R
TSNR2_LYA_R	float32		LYA R template (S/N)^2
TSNR2_BGS_R	float32		BGS R template (S/N)^2
TSNR2_GPBBACKUP_R	float32		template (S/N)^2 for backup targets in guider pass band on R
TSNR2_QSO_R	float32		QSO R template (S/N)^2
TSNR2_LRG_R	float32		LRG R template (S/N)^2
TSNR2_GPBDARK_Z	float32		template (S/N)^2 for dark targets in guider pass band on Z
TSNR2_ELG_Z	float32		ELG Z template (S/N)^2
TSNR2_GPBBRIGHT_Z	float32		template (S/N)^2 for bright targets in guider pass band on Z
TSNR2_LYA_Z	float32		LYA Z template (S/N)^2
TSNR2_BGS_Z	float32		BGS Z template (S/N)^2
TSNR2_GPBBACKUP_Z	float32		template (S/N)^2 for backup targets in guider pass band on Z
TSNR2_QSO_Z	float32		QSO Z template (S/N)^2
TSNR2_LRG_Z	float32		LRG Z template (S/N)^2
TSNR2_GPBDARK	float32		template (S/N)^2 for dark targets in guider pass band
TSNR2_ELG	float32		ELG template (S/N)^2 summed over B,R,Z
TSNR2_GPBBRIGHT	float32		template (S/N)^2 for bright targets in guider pass band
TSNR2_LYA	float32		LYA template (S/N)^2 summed over B,R,Z
TSNR2_BGS	float32		BGS template (S/N)^2 summed over B,R,Z
TSNR2_GPBBACKUP	float32		template (S/N)^2 for backup targets in guider pass band
TSNR2_QSO	float32		QSO template (S/N)^2 summed over B,R,Z
TSNR2_LRG	float32		LRG template (S/N)^2 summed over B,R,Z
OII_FLUX	float32		[OII] doublet flux from emission line fit
OII_FLUX_IVAR	float32		Inverse variance of OII_FLUX
IS_QSO_MGII	logical		True if this object is classified as a QSO by the MgII afterburner
IS_QSO_QN_NEW_RR	logical		True if QuasarNET classification differs from Redrock and target is a QSO
C_LYA	float32		QuasarNET confidence for Lyman-alpha line
C_CIV	float32		QuasarNET confidence for CIV line
C_CIII	float32		QuasarNET confidence for CIII line
C_MgII	float32		QuasarNET confidence for MgII line
C_Hbeta	float32		QuasarNET confidence for H-beta line
C_Halpha	float32		QuasarNET confidence for H-alpha line
Z_NEW	float64		QuasarNET redshift (when IS_QSO_QN_NEW_RR is True)
ZERR_NEW	float64		QuasarNET redshift error
ZWARN_NEW	int64		Redshift warning bitmask for QuasarNET redshift
SPECTYPE_NEW	char[6]		Spectral type from QuasarNET fit
SUBTYPE_NEW	char[20]		Spectral subtype from QuasarNET fit
CHI2_NEW	float64		Chi squared for QuasarNET fit
DELTACHI2_NEW	float64		Delta chi2 for QuasarNET fit
COEFF_NEW	float64[10]		Template coefficients for QuasarNET fit
GOOD_Z_BGS	logical		True if BGS target with high-confidence redshift passing LSS quality cuts
GOOD_Z_LRG	logical		True if LRG target with high-confidence redshift passing LSS quality cuts
GOOD_Z_ELG	logical		True if ELG target with high-confidence redshift passing LSS quality cuts
GOOD_Z_QSO	logical		True if QSO target with high-confidence redshift (Z_QSO) passing LSS quality cuts
Z_QSO	float64		QuasarNET-corrected QSO redshift (used in GOOD_Z_QSO evaluation)
ZERR_QSO	float32		Error on Z_QSO

[1] (1,2,3,4)

Optional