=========== sptab_coadd =========== :Summary: FERRE results from coadded spectra for a given HEALPIX. :Naming Convention: ``sptab_coadd-{SURVEY}-{PROGRAM}-{HEALPIX}.fits``, where SURVEY is main, special, sv1, sv2, sv3, and PROGRAM is dark, bright, backup, other. :Regex: ``sptab_coadd-.*-.*-.*.fits`` :File Type: FITS, 135 KB Contents ======== ====== ======== ======== =================== Number EXTNAME Type Contents ====== ======== ======== =================== HDU0_ IMAGE Empty HDU HDU1_ SPTAB BINTABLE FERRE results HDU2_ FIBERMAP BINTABLE Information about objects inherited from targeting HDU3_ SCORES BINTABLE Information about spectra quality HDU4_ AUX BINTABLE Auxiliary information: names of the parameters and chemical elements in the order used in building the PARAM and ELEM arrays in SPTAB ====== ======== ======== =================== FITS Header Units ================= HDU0 ---- Empty HDU. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ======== ================================================ ===== ======= KEY Example Value Type Comment ======== ================================================ ===== ======= DATE 2023-04-09T03:26:22 str Date of processing FCONFIG desi-sm.yaml str FERRE config information HOST login36 str machine used OS posix str Operative system PLATFORM Linux 5.14.21-150400.24.46_12.0.63-cray_shasta_c str OS details NSPEC 93 int Number of spectra included FTIME 5202.688 float Compute time used by FERRE STIME 2520.0 float Compute time estimated for Slurm NCORES 64 int Number of cores in node NTHREADS 12 int Number of cores used by large FERRE instances NUMPY 1.21.5 str NumPy version ASTROPY 5.1 str AstroPy version MATPLOTL 3.5.2 str Matplotlib version SCIPY 1.7.3 str SciPy version YAML 6.0 str Yaml version PYTHON 3.9.7 str Python version PIFERRE 0.4 str Piferre version FERRE 5.1.1 str FERRE version ======== ================================================ ===== ======= HDU1 ---- EXTNAME = SPTAB This is the table of measurements by FERRE of coadded DESI spectra for a given HEALPIX. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ====== ============= ==== ===================== KEY Example Value Type Comment ====== ============= ==== ===================== NAXIS1 545 int length of dimension 1 NAXIS2 93 int length of dimension 2 ====== ============= ==== ===================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ========== =========== ====== =================================================================================================== Name Type Units Description ========== =========== ====== =================================================================================================== SUCCESS int64 Bit indicating whether the code has likely produced useful results TARGETID int64 Unique DESI target ID TARGET_RA float64 deg Barycentric right ascension in ICRS TARGET_DEC float64 deg Barycentric declination in ICRS 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 SRCFILE char[23] DESI data file BESTGRID char[8] Model grid that produced the best fit TEFF float64 K Effective temperature (K) LOGG float64 Surface gravity (g in cm/s**2) FEH float64 Metallicity [Fe/H] = log10(N(Fe)/N(H)) - log10(N(Fe)/N(H))sun ALPHAFE float64 Alpha-to-iron ratio [alpha/Fe] LOG10MICRO float64 Log10 of Microturbulence (km/s) PARAM float64[5] Array of atmospheric parameters ([Fe/H], [a/Fe], log10micro, Teff,logg) COVAR float64[25] Covariance matrix for ([Fe/H], [a/Fe], log10micro, Teff,logg) ELEM float64[10] Elemental abundance ratios to hydrogen [elem/H] ELEM_ERR float64[10] Uncertainties in the elemental abundance ratios CHISQ_TOT float64 Total chi**2 SNR_MED float64 Median signal-to-ratio RV_ADOP float64 km s-1 Adopted Radial Velocity (km/s) RV_ERR float64 km s-1 Uncertainty in the adopted Radial Velocity (km/s) ========== =========== ====== =================================================================================================== HDU2 ---- EXTNAME = FIBERMAP FIBERMAP table with information on individual targets copied from original coadd file. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ====== ============= ==== ===================== KEY Example Value Type Comment ====== ============= ==== ===================== NAXIS1 317 int length of dimension 1 NAXIS2 93 int length of dimension 2 ====== ============= ==== ===================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ========================== ======= ============ =============================================================================================================================== Name Type Units Description ========================== ======= ============ =============================================================================================================================== TARGETID int64 Unique DESI target ID COADD_FIBERSTATUS int32 bitwise-AND of input FIBERSTATUS 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 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 SCND_TARGET int64 Target selection bitmask for secondary programs 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 Barycentric Right Ascension in ICRS to be used by PlateMaker PLATE_DEC float64 deg Barycentric Declination in ICRS 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 The table with various quality information about spectra. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ====== ============= ==== ===================== KEY Example Value Type Comment ====== ============= ==== ===================== NAXIS1 172 int length of dimension 1 NAXIS2 93 int length of dimension 2 ====== ============= ==== ===================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: 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 = AUX Additional information on the order of the parameters and elements in the arrays PARAM and ELEM, respectively. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ====== ============= ==== ===================== KEY Example Value Type Comment ====== ============= ==== ===================== NAXIS1 70 int length of dimension 1 NAXIS2 1 int length of dimension 2 ====== ============= ==== ===================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ==== ======== ===== ======================================================== Name Type Units Description ==== ======== ===== ======================================================== p char[50] The names of atmospheric parameters in the FERRE fit e char[20] The names of elements for which abundances were derived ==== ======== ===== ========================================================