rvtab_coadd

Summary:

RVspecfit measurements of coadded spectra in a given healpix.

Naming Convention:

rvtab_coadd-sv3-bright-10016.fits, where this would be the file from sv3 survey in bright program in 10016 healpixel

File Type:

FITS, 61 KB This section gives the type of the file and its approximate size.

Contents

Number	EXTNAME	Type	Contents
HDU0		IMAGE	Empty HDU
HDU1	RVTAB	BINTABLE	RVSpecfit results
HDU2	FIBERMAP	BINTABLE	Information about objects inherited from targeting
HDU3	SCORES	BINTABLE	Information about spectra quality*
HDU4	EXP_FIBERMAP	BINTABLE	Fibermap corresponding to different exposures

FITS Header Units

HDU0

Summarize the contents of this HDU.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
TMPLCON0	desi_b	str	Spec arm config name
TMPLREV0	v211202	str	Spec template revision
TMPLSVR0	0.1.0.210117+devfee7ee	str	Spec template soft version
TMPLCON1	desi_r	str	Spec arm config name
TMPLREV1	v211202	str	Spec template revision
TMPLSVR1	0.1.0.210117+devfee7ee	str	Spec template soft version
TMPLCON2	desi_z	str	Spec arm config name
TMPLREV2	v211202	str	Spec template revision
TMPLSVR2	0.1.0.210117+devfee7ee	str	Spec template soft version
RVS_CONF	/global/cfs/cdirs/desi/science/mws/scripts/configs/config_211202.yaml	str
CHECKSUM	XbH4YaG1XaG1XaG1	str	HDU checksum updated 2022-03-13T17:03:18
DATASUM	0	str	data unit checksum updated 2022-03-13T17:03:18

Empty HDU.

HDU1

EXTNAME = RVTAB

The table of RVSpecfit measurements in a given healpixel.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	231	int	length of dimension 1
NAXIS2	7	int	length of dimension 2
CHECKSUM	cakocTjmcYjmcYjm	str	HDU checksum updated 2022-03-13T17:03:18
DATASUM	2504015193	str	data unit checksum updated 2022-03-13T17:03:18

Required Data Table Columns

Name	Type	Units	Description
VRAD	float64	km s-1	Radial velocity
VRAD_ERR	float64	km s-1	Radial velocity error
VRAD_SKEW	float64		Radial velocity posterior skewness
VRAD_KURT	float64		Radial velocity posterior kurtosis
LOGG	float64		Log of surface gravity
TEFF	float64	K	Effective temperature
ALPHAFE	float64		[alpha/Fe] from template fitting
FEH	float64		[Fe/H] from template fitting
LOGG_ERR	float64		Log of surface gravity uncertainty
TEFF_ERR	float64	K	Effective temperature uncertainty
ALPHAFE_ERR	float64		[alpha/Fe] uncertainty from template fitting
FEH_ERR	float64		[Fe/H] uncertainty from template fitting
VSINI	float64	km s-1	Stellar rotation velocity
NEXP	int64
CHISQ_TOT	float64		Total chi-square for all arms
CHISQ_C_TOT	float64		Total chi-square for all arms for polynomial only fit
CHISQ_B	float64		Chi-square in the B arm
CHISQ_C_B	float64		Chi-square in the B arm after fitting continuum only
CHISQ_R	float64		Chi-square in the R arm
CHISQ_C_R	float64		Chi-square in the R arm after fitting continuum only
CHISQ_Z	float64		Chi-square in the Z arm
CHISQ_C_Z	float64		Chi-square in the Z arm after fitting continuum only
RVS_WARN	int64		RVSpecFit warning flag
REF_ID	int64		Tyc1*1,000,000+Tyc2*10+Tyc3 for Tycho-2; sourceid for Gaia DR2
REF_CAT	char[2]		Reference catalog source for star: T2 for Tycho-2, G2 for Gaia DR2, L2 for the SGA, empty otherwise
TARGET_RA	float64	deg	Target right ascension
TARGET_DEC	float64	deg	Target declination
TARGETID	int64		Unique DESI target ID
SN_B	float32		Median S/N in the B arm
SN_R	float32		Median S/N in the R arm
SN_Z	float32		Median S/N in the Z arm
SUCCESS	logical		Did we succeed or fail

HDU2

EXTNAME = FIBERMAP

Information about objects inherited from targeting

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	341	int	length of dimension 1
NAXIS2	7	int	length of dimension 2
CHECKSUM	eMIggKIfeKIfeKIf	str	HDU checksum updated 2022-03-13T17:03:18
DATASUM	19021304	str	data unit checksum updated 2022-03-13T17:03:18

Required Data Table Columns

Name	Type	Units	Description
TARGETID	int64		Unique DESI target ID
COADD_FIBERSTATUS	int32		bitwise-AND of input FIBERSTATUS
TARGET_RA	float64	deg	Target right ascension
TARGET_DEC	float64	deg	Target declination
PMRA	float32	mas yr^-1	proper motion in the +RA direction (already including cos(dec))
PMDEC	float32	mas yr^-1	Proper motion in the +Dec direction
REF_EPOCH	float32	yr	Reference epoch for Gaia/Tycho astrometry. Typically 2015.5 for Gaia
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)
OBJTYPE	char[3]		Object type: TGT, SKY, NON, BAD
SUBPRIORITY	float64		Random subpriority [0-1) to break assignment ties
OBSCONDITIONS	int32		Bitmask of allowed observing conditions
RELEASE	int16		Imaging surveys release ID
BRICKNAME	char[8]		Brick name from tractor input
BRICKID	int32		Brick ID from tractor input
BRICK_OBJID	int32		Imaging Surveys OBJID on that brick
MORPHTYPE	char[4]		Imaging Surveys morphological type from Tractor
EBV	float32	mag	Galactic extinction E(B-V) reddening from SFD98
FLUX_G	float32	nanomaggy	Flux in the Legacy Survey g-band (AB)
FLUX_R	float32	nanomaggy	Flux in the Legacy Survey r-band (AB)
FLUX_Z	float32	nanomaggy	Flux in the Legacy Survey z-band (AB)
FLUX_W1	float32	nanomaggy	WISE flux in W1 (AB)
FLUX_W2	float32	nanomaggy	WISE flux in W2 (AB)
FLUX_IVAR_G	float32	nanomaggy^-2	Inverse variance of FLUX_G (AB)
FLUX_IVAR_R	float32	nanomaggy^-2	Inverse variance of FLUX_R (AB)
FLUX_IVAR_Z	float32	nanomaggy^-2	Inverse variance of FLUX_Z (AB)
FLUX_IVAR_W1	float32	nanomaggy^-2	Inverse variance of FLUX_W1 (AB)
FLUX_IVAR_W2	float32	nanomaggy^-2	Inverse variance of FLUX_W2 (AB)
FIBERFLUX_G	float32	nanomaggy	Predicted g-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing
FIBERFLUX_R	float32	nanomaggy	Predicted r-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing
FIBERFLUX_Z	float32	nanomaggy	Predicted z-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing
FIBERTOTFLUX_G	float32	nanomaggy	Predicted g-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing
FIBERTOTFLUX_R	float32	nanomaggy	Predicted r-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing
FIBERTOTFLUX_Z	float32	nanomaggy	Predicted z-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing
MASKBITS	int16		Bitwise mask from the imaging indicating potential issue or blending
SERSIC	float32		Power-law index for the Sersic profile model (MORPHTYPE=SER)
SHAPE_R	float32	arcsec	Half-light radius of galaxy model (>0)
SHAPE_E1	float32		Ellipticity component 1 of galaxy model for galaxy type MORPHTYPE
SHAPE_E2	float32		Ellipticity component 2 of galaxy model for galaxy type MORPHTYPE
REF_ID	int64		Tyc1*1,000,000+Tyc2*10+Tyc3 for Tycho-2; sourceid for Gaia DR2
REF_CAT	char[2]		Reference catalog source for star: T2 for Tycho-2, G2 for Gaia DR2, L2 for the SGA, empty otherwise
GAIA_PHOT_G_MEAN_MAG	float32	mag	Gaia G band magnitude
GAIA_PHOT_BP_MEAN_MAG	float32	mag	Gaia BP band magnitude
GAIA_PHOT_RP_MEAN_MAG	float32	mag	Gaia RP band magnitude
PARALLAX	float32	mas	Reference catalog parallax
PHOTSYS	char[1]		N for the MzLS/BASS photometric system, S for DECaLS
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
SV3_DESI_TARGET	int64		DESI (dark time program) target selection bitmask for SV3
SV3_BGS_TARGET	int64		BGS (bright time program) target selection bitmask for SV3
SV3_MWS_TARGET	int64		MWS (bright time program) target selection bitmask for SV3
SV3_SCND_TARGET	int64		Secondary target selection bitmask for SV3
DESI_TARGET	int64		DESI (dark time program) target selection bitmask
BGS_TARGET	int64		BGS (Bright Galaxy Survey) target selection bitmask
MWS_TARGET	int64		Milky Way Survey targeting bits
PLATE_RA	float64	deg	Right Ascension to be used by PlateMaker
PLATE_DEC	float64	deg	Declination to be used by PlateMaker
COADD_NUMEXP	int16		Number of exposures in coadd
COADD_EXPTIME	float32	s	Summed exposure time for coadd
COADD_NUMNIGHT	int16		Number of nights in coadd
COADD_NUMTILE	int16		Number of tiles in coadd
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_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_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

HDU3

EXTNAME = SCORES

Information about spectra quality

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	172	int	length of dimension 1
NAXIS2	7	int	length of dimension 2
CHECKSUM	XMRcaJOaRJOaXJOa	str	HDU checksum updated 2022-03-13T17:03:18
DATASUM	118963768	str	data unit checksum updated 2022-03-13T17:03:18

Required Data Table Columns

Name	Type	Units	Description
TARGETID	int64		Unique DESI target ID
INTEG_COADD_FLUX_B	float32
MEDIAN_COADD_FLUX_B	float32
MEDIAN_COADD_SNR_B	float32
INTEG_COADD_FLUX_R	float32
MEDIAN_COADD_FLUX_R	float32
MEDIAN_COADD_SNR_R	float32
INTEG_COADD_FLUX_Z	float32
MEDIAN_COADD_FLUX_Z	float32
MEDIAN_COADD_SNR_Z	float32
TSNR2_GPBDARK_B	float32
TSNR2_ELG_B	float32		ELG B template (S/N)^2
TSNR2_GPBBRIGHT_B	float32
TSNR2_LYA_B	float32		LYA B template (S/N)^2
TSNR2_BGS_B	float32		BGS B template (S/N)^2
TSNR2_GPBBACKUP_B	float32
TSNR2_QSO_B	float32		QSO B template (S/N)^2
TSNR2_LRG_B	float32		LRG B template (S/N)^2
TSNR2_GPBDARK_R	float32
TSNR2_ELG_R	float32		ELG R template (S/N)^2
TSNR2_GPBBRIGHT_R	float32
TSNR2_LYA_R	float32		LYA R template (S/N)^2
TSNR2_BGS_R	float32		BGS R template (S/N)^2
TSNR2_GPBBACKUP_R	float32
TSNR2_QSO_R	float32		QSO R template (S/N)^2
TSNR2_LRG_R	float32		LRG R template (S/N)^2
TSNR2_GPBDARK_Z	float32
TSNR2_ELG_Z	float32		ELG Z template (S/N)^2
TSNR2_GPBBRIGHT_Z	float32
TSNR2_LYA_Z	float32		LYA Z template (S/N)^2
TSNR2_BGS_Z	float32		BGS Z template (S/N)^2
TSNR2_GPBBACKUP_Z	float32
TSNR2_QSO_Z	float32		QSO Z template (S/N)^2
TSNR2_LRG_Z	float32		LRG Z template (S/N)^2
TSNR2_GPBDARK	float32
TSNR2_ELG	float32		ELG template (S/N)^2 summed over B,R,Z
TSNR2_GPBBRIGHT	float32
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
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

HDU4

EXTNAME = EXP_FIBERMAP

The fibermap records corresponding to individual exposures that went into the stack

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	162	int	length of dimension 1
NAXIS2	24	int	length of dimension 2
CHECKSUM	1TAb3T4Z1T9b1T9Z	str	HDU checksum updated 2022-03-13T17:03:18
DATASUM	672476038	str	data unit checksum updated 2022-03-13T17:03:18

Required Data Table Columns

Name	Type	Units	Description
TARGETID	int64		Unique DESI target ID
PRIORITY	int32		Target current priority
SUBPRIORITY	float64		Random subpriority [0-1) to break assignment ties
NIGHT	int32
EXPID	int32		DESI Exposure ID number
MJD	float64		Modified Julian Date when shutter was opened for this exposure
TILEID	int32		Unique DESI tile ID
EXPTIME	float64	s	Length of time shutter was open
PETAL_LOC	int16		Petal location [0-9]
DEVICE_LOC	int32		Device location on focal plane [0-523]
LOCATION	int64		Location on the focal plane PETAL_LOC*1000 + DEVICE_LOC
FIBER	int32		Fiber ID on the CCDs [0-4999]
FIBERSTATUS	int32		Fiber status mask. 0=good
FIBERASSIGN_X	float32	mm	Fiberassign expected CS5 X location on focal plane
FIBERASSIGN_Y	float32	mm	Fiberassign expected CS5 Y location on focal plane
LAMBDA_REF	float32	Angstrom	Requested wavelength at which targets should be centered on fibers
PLATE_RA	float64	deg	Right Ascension to be used by PlateMaker
PLATE_DEC	float64	deg	Declination to be used by PlateMaker
NUM_ITER	int64		Number of positioner iterations
FIBER_X	float64	mm	CS5 X location requested by PlateMaker
FIBER_Y	float64	mm	CS5 Y location requested by PlateMaker
DELTA_X	float64	mm	CS5 X requested minus actual position
DELTA_Y	float64	mm	CS5 Y requested minus actual position
FIBER_RA	float64	deg	RA of actual fiber position
FIBER_DEC	float64	deg	DEC of actual fiber position
PSF_TO_FIBER_SPECFLUX	float64		fraction of light from point-like source captured by 1.5 arcsec diameter fiber given atmospheric seeing