rvpix_exp

Summary:

RVSpecfit measurements from individual exposures in different surveys, programs.

Naming Convention:

rvpix_exp-{SURVEY}-{PROGRAM}.fits, where survey is sv1, sv2.. program is dark, bright, …

File Type:

FITS, 5 GB 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	GAIA	BINTABLE	Gaia crossmatch

FITS Header Units

HDU0

Summarize the contents of this HDU.

This HDU has no non-standard required keywords.

Empty HDU.

HDU1

EXTNAME = RVTAB

This is table of measurements by RVSpecfit of individual exposures in DESI for a given survey/program.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	265	int	length of dimension 1
NAXIS2	3572976	int	length of dimension 2
CHECKSUM	BahGCUf9BafEBUf9	str	HDU checksum updated 2024-12-19T17:16:48
DATASUM	1913037089	str	data unit checksum updated 2024-12-19T17:16:48

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
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
FIBER	int32		Fiber ID on the CCDs [0-4999]
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	Barycentric right ascension in ICRS
TARGET_DEC	float64	deg	Barycentric declination in ICRS
TARGETID	int64		Unique DESI target ID
EXPID	int32		DESI Exposure ID number
SN_B	float64		Median S/N in the B arm
SN_R	float64		Median S/N in the R arm
SN_Z	float64		Median S/N in the Z arm
SUCCESS	logical		Did we succeed or fail
RR_Z	float64		Redrock redshift
RR_SPECTYPE	char[6]		Redrock spectype
HEALPIX	int64		HEALPixel containing this location at NSIDE=64 in the NESTED scheme

HDU2

EXTNAME = FIBERMAP

FIBERMAP table with information on individual targets copied from original spectra- file.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	389	int	length of dimension 1
NAXIS2	3572976	int	length of dimension 2
CHECKSUM	2CZO39WL2AWL29WL	str	HDU checksum updated 2024-12-19T17:17:17
DATASUM	495390822	str	data unit checksum updated 2024-12-19T17:17:17

Required Data Table Columns

Name	Type	Units	Description
TARGETID	int64		Unique DESI target ID
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
TARGET_RA	float64	deg	Barycentric right ascension in ICRS
TARGET_DEC	float64	deg	Barycentric declination in ICRS
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
LAMBDA_REF	float32	Angstrom	Requested wavelength at which targets should be centered on fibers
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
FIBERASSIGN_X	float32	mm	Fiberassign expected CS5 X location on focal plane
FIBERASSIGN_Y	float32	mm	Fiberassign expected CS5 Y location on focal plane
PRIORITY	int32		Target current priority
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
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
SCND_TARGET	int64		Target selection bitmask for secondary programs
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
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
EXPTIME	float64	s	Length of time shutter was open
PSF_TO_FIBER_SPECFLUX	float64		fraction of light from point-like source captured by 1.5 arcsec diameter fiber given atmospheric seeing
NIGHT	int32		Night of observation (YYYYMMDD) starting at local noon before observations start
EXPID	int32		DESI Exposure ID number
MJD	float64	d	Modified Julian Date when shutter was opened for this exposure
TILEID	int32		Unique DESI tile ID

HDU3

EXTNAME = SCORES

The table with various quality information about spectra.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	488	int	length of dimension 1
NAXIS2	3572976	int	length of dimension 2
CHECKSUM	9fTEHdQE9dQEEdQE	str	HDU checksum updated 2024-12-19T17:17:33
DATASUM	4196603941	str	data unit checksum updated 2024-12-19T17:17:33

Required Data Table Columns

Name	Type	Units	Description
TARGETID	int64		Unique DESI target ID
SUM_RAW_COUNT_B	float64		Sum of raw counts in B camera
MEDIAN_RAW_COUNT_B	float64		Median of raw counts in B camera
MEDIAN_RAW_SNR_B	float64		Median(raw signal/noise) in B camera
SUM_FFLAT_COUNT_B	float64		Sum of fiber-flatfielded counts B camera
MEDIAN_FFLAT_COUNT_B	float64		Median of fiber-flatfielded counts in B camera
MEDIAN_FFLAT_SNR_B	float64		Median(S/N) of fiberflatfielded counts in B camera
SUM_SKYSUB_COUNT_B	float64		Sum of sky-subtracted counts in B camera
MEDIAN_SKYSUB_COUNT_B	float64		Median of sky-subtracted counts in B camera
MEDIAN_SKYSUB_SNR_B	float64		Median(S/N) of sky-subtracted counts in B camera
SUM_CALIB_COUNT_B	float64		Sum of calibrated flux in B camera
MEDIAN_CALIB_COUNT_B	float64		Median of calibrated flux in B camera
MEDIAN_CALIB_SNR_B	float64		Median(S/N) of calibrated flux in B camera
TSNR2_GPBDARK_B	float64		template (S/N)^2 for dark targets in guider pass band on B
TSNR2_ELG_B	float64		ELG B template (S/N)^2
TSNR2_GPBBRIGHT_B	float64		template (S/N)^2 for bright targets in guider pass band on B
TSNR2_LYA_B	float64		LYA B template (S/N)^2
TSNR2_BGS_B	float64		BGS B template (S/N)^2
TSNR2_GPBBACKUP_B	float64		template (S/N)^2 for backup targets in guider pass band on B
TSNR2_QSO_B	float64		QSO B template (S/N)^2
TSNR2_LRG_B	float64		LRG B template (S/N)^2
SUM_RAW_COUNT_R	float64		Sum of raw counts in R camera
MEDIAN_RAW_COUNT_R	float64		Median of raw counts in R camera
MEDIAN_RAW_SNR_R	float64		Median(raw signal/noise) in R camera
SUM_FFLAT_COUNT_R	float64		Sum of fiber-flatfielded counts R camera
MEDIAN_FFLAT_COUNT_R	float64		Median of fiber-flatfielded counts in R camera
MEDIAN_FFLAT_SNR_R	float64		Median(S/N) of fiberflatfielded counts in R camera
SUM_SKYSUB_COUNT_R	float64		Sum of sky-subtracted counts in R camera
MEDIAN_SKYSUB_COUNT_R	float64		Median of sky-subtracted counts in R camera
MEDIAN_SKYSUB_SNR_R	float64		Median(S/N) of sky-subtracted counts in R camera
SUM_CALIB_COUNT_R	float64		Sum of calibrated flux in R camera
MEDIAN_CALIB_COUNT_R	float64		Median of calibrated flux in R camera
MEDIAN_CALIB_SNR_R	float64		Median(S/N) of calibrated flux in R camera
TSNR2_GPBDARK_R	float64		template (S/N)^2 for dark targets in guider pass band on R
TSNR2_ELG_R	float64		ELG R template (S/N)^2
TSNR2_GPBBRIGHT_R	float64		template (S/N)^2 for bright targets in guider pass band on R
TSNR2_LYA_R	float64		LYA R template (S/N)^2
TSNR2_BGS_R	float64		BGS R template (S/N)^2
TSNR2_GPBBACKUP_R	float64		template (S/N)^2 for backup targets in guider pass band on R
TSNR2_QSO_R	float64		QSO R template (S/N)^2
TSNR2_LRG_R	float64		LRG R template (S/N)^2
SUM_RAW_COUNT_Z	float64		Sum of raw counts in Z camera
MEDIAN_RAW_COUNT_Z	float64		Median of raw counts in Z camera
MEDIAN_RAW_SNR_Z	float64		Median(raw signal/noise) in Z camera
SUM_FFLAT_COUNT_Z	float64		Sum of fiber-flatfielded counts Z camera
MEDIAN_FFLAT_COUNT_Z	float64		Median of fiber-flatfielded counts in Z camera
MEDIAN_FFLAT_SNR_Z	float64		Median(S/N) of fiberflatfielded counts in Z camera
SUM_SKYSUB_COUNT_Z	float64		Sum of sky-subtracted counts in Z camera
MEDIAN_SKYSUB_COUNT_Z	float64		Median of sky-subtracted counts in Z camera
MEDIAN_SKYSUB_SNR_Z	float64		Median(S/N) of sky-subtracted counts in Z camera
SUM_CALIB_COUNT_Z	float64		Sum of calibrated flux in Z camera
MEDIAN_CALIB_COUNT_Z	float64		Median of calibrated flux in Z camera
MEDIAN_CALIB_SNR_Z	float64		Median(S/N) of calibrated flux in Z camera
TSNR2_GPBDARK_Z	float64		template (S/N)^2 for dark targets in guider pass band on Z
TSNR2_ELG_Z	float64		ELG Z template (S/N)^2
TSNR2_GPBBRIGHT_Z	float64		template (S/N)^2 for bright targets in guider pass band on Z
TSNR2_LYA_Z	float64		LYA Z template (S/N)^2
TSNR2_BGS_Z	float64		BGS Z template (S/N)^2
TSNR2_GPBBACKUP_Z	float64		template (S/N)^2 for backup targets in guider pass band on Z
TSNR2_QSO_Z	float64		QSO Z template (S/N)^2
TSNR2_LRG_Z	float64		LRG Z template (S/N)^2

HDU4

EXTNAME = GAIA

The Gaia DR3 measurements for each object in the catalog.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	438	int	length of dimension 1
NAXIS2	3572976	int	length of dimension 2
CHECKSUM	EB5AH929EA2AE927	str	HDU checksum updated 2024-12-19T17:18:07
DATASUM	3494719464	str	data unit checksum updated 2024-12-19T17:18:07

Required Data Table Columns

Name	Type	Units	Description
SOURCE_ID	int64
RANDOM_INDEX	int64
REF_EPOCH	float64	yr	Reference epoch for Gaia/Tycho astrometry. Typically 2015.5 for Gaia
RA	float64	deg	Barycentric Right Ascension in ICRS
RA_ERROR	float32
DEC	float64	deg	Barycentric declination in ICRS
DEC_ERROR	float32
PARALLAX	float64	mas	Reference catalog parallax
PARALLAX_ERROR	float32
PARALLAX_OVER_ERROR	float32
PMRA	float64	mas yr^-1	proper motion in the +RA direction (already including cos(dec))
PMRA_ERROR	float32
PMDEC	float64	mas yr^-1	Proper motion in the +Dec direction
PMDEC_ERROR	float32
RA_DEC_CORR	float32
RA_PARALLAX_CORR	float32
RA_PMRA_CORR	float32
RA_PMDEC_CORR	float32
DEC_PARALLAX_CORR	float32
DEC_PMRA_CORR	float32
DEC_PMDEC_CORR	float32
PARALLAX_PMRA_CORR	float32
PARALLAX_PMDEC_CORR	float32
PMRA_PMDEC_CORR	float32
ASTROMETRIC_N_OBS_AL	int16
ASTROMETRIC_N_OBS_AC	int16
ASTROMETRIC_N_GOOD_OBS_AL	int16
ASTROMETRIC_N_BAD_OBS_AL	int16
ASTROMETRIC_GOF_AL	float32
ASTROMETRIC_CHI2_AL	float32
ASTROMETRIC_EXCESS_NOISE	float32
ASTROMETRIC_EXCESS_NOISE_SIG	float32
ASTROMETRIC_PARAMS_SOLVED	int16
ASTROMETRIC_PRIMARY_FLAG	logical
NU_EFF_USED_IN_ASTROMETRY	float32
PSEUDOCOLOUR	float32
PSEUDOCOLOUR_ERROR	float32
RA_PSEUDOCOLOUR_CORR	float32
DEC_PSEUDOCOLOUR_CORR	float32
PARALLAX_PSEUDOCOLOUR_CORR	float32
PMRA_PSEUDOCOLOUR_CORR	float32
PMDEC_PSEUDOCOLOUR_CORR	float32
ASTROMETRIC_MATCHED_TRANSITS	int16
VISIBILITY_PERIODS_USED	int16
ASTROMETRIC_SIGMA5D_MAX	float32
MATCHED_TRANSITS	int16
NEW_MATCHED_TRANSITS	int16
MATCHED_TRANSITS_REMOVED	int16
IPD_GOF_HARMONIC_AMPLITUDE	float32
IPD_GOF_HARMONIC_PHASE	float32
IPD_FRAC_MULTI_PEAK	int16
IPD_FRAC_ODD_WIN	int16
RUWE	float32
DUPLICATED_SOURCE	logical
PHOT_G_N_OBS	int16
PHOT_G_MEAN_FLUX	float64
PHOT_G_MEAN_FLUX_ERROR	float32
PHOT_G_MEAN_FLUX_OVER_ERROR	float32
PHOT_G_MEAN_MAG	float32
PHOT_BP_N_OBS	int16
PHOT_BP_MEAN_FLUX	float64
PHOT_BP_MEAN_FLUX_ERROR	float32
PHOT_BP_MEAN_FLUX_OVER_ERROR	float32
PHOT_BP_MEAN_MAG	float32
PHOT_RP_N_OBS	int16
PHOT_RP_MEAN_FLUX	float64
PHOT_RP_MEAN_FLUX_ERROR	float32
PHOT_RP_MEAN_FLUX_OVER_ERROR	float32
PHOT_RP_MEAN_MAG	float32
PHOT_BP_RP_EXCESS_FACTOR	float32
PHOT_BP_N_CONTAMINATED_TRANSITS	int16
PHOT_BP_N_BLENDED_TRANSITS	int16
PHOT_RP_N_CONTAMINATED_TRANSITS	int16
PHOT_RP_N_BLENDED_TRANSITS	int16
PHOT_PROC_MODE	int16
BP_RP	float32
BP_G	float32
G_RP	float32
RADIAL_VELOCITY	float32
RADIAL_VELOCITY_ERROR	float32
RV_METHOD_USED	int16
RV_NB_TRANSITS	int16
RV_NB_DEBLENDED_TRANSITS	int16
RV_VISIBILITY_PERIODS_USED	int16
RV_EXPECTED_SIG_TO_NOISE	float32
RV_RENORMALISED_GOF	float32
RV_CHISQ_PVALUE	float32
RV_TIME_DURATION	float32
RV_AMPLITUDE_ROBUST	float32
RV_TEMPLATE_TEFF	float32
RV_TEMPLATE_LOGG	float32
RV_TEMPLATE_FE_H	float32
RV_ATM_PARAM_ORIGIN	int16
VBROAD	float32
VBROAD_ERROR	float32
VBROAD_NB_TRANSITS	int16
GRVS_MAG	float32
GRVS_MAG_ERROR	float32
GRVS_MAG_NB_TRANSITS	int16
RVS_SPEC_SIG_TO_NOISE	float32
ECL_LON	float64
ECL_LAT	float64
IN_QSO_CANDIDATES	logical
IN_GALAXY_CANDIDATES	logical
NON_SINGLE_STAR	int16
HAS_XP_CONTINUOUS	logical
HAS_XP_SAMPLED	logical
HAS_RVS	logical
HAS_EPOCH_PHOTOMETRY	logical
HAS_EPOCH_RV	logical
IN_ANDROMEDA_SURVEY	logical
CLASSPROB_DSC_COMBMOD_QUASAR	float32
CLASSPROB_DSC_COMBMOD_GALAXY	float32
CLASSPROB_DSC_COMBMOD_STAR	float32
TEFF_GSPPHOT	float32
LOGG_GSPPHOT	float32
MH_GSPPHOT	float32
EBV	float32	mag	Galactic extinction E(B-V) reddening from SFD98

Notes and Examples

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