.. _fastphot datamodel: =================== Fastphot Data Model =================== :Summary: Broadband photometric fitting results. :Naming Convention: ``fastphot-SURVEY-PROGRAM-HEALPIX.fits``, where ``SURVEY`` is the survey name (e.g., *main* or *sv3*), ``PROGRAM`` is the program name (e.g., *bright* or *dark*), and ``HEALPIX`` is the healpixel number. :Regex: ``fastphot-(cmx|main|special|sv1|sv2|sv3)-(backup|bright|dark|other)-[0-9]+\.fits`` :File Type: FITS Contents ======== ====== ============ ======== ====================== Number EXTNAME Type Contents ====== ============ ======== ====================== HDU00_ PRIMARY IMAGE Keywords only. HDU01_ FASTPHOT BINTABLE Table with photometric fitting results. HDU02_ METADATA BINTABLE Table with sample metadata. ====== ============ ======== ====================== FITS Header Units ================= HDU00 ----- EXTNAME = PRIMARY Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table :open: .. rst-class:: keywords ======== ================ ==== ============================================== KEY Example Value Type Comment ======== ================ ==== ============================================== SPECPROD iron str Spectroscopic production name COADDTYP healpix str Type of spectral coadd (healpix,cumulative,pernight,perexp) CHECKSUM UKXHaIWHUIWHaIWH str HDU checksum updated 2022-08-02T00:24:13 DATASUM 0 str data unit checksum updated 2022-08-02T00:24:13 ======== ================ ==== ============================================== Empty HDU. HDU01 ----- EXTNAME = FASTPHOT Broadband photometric fitting results. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table :open: .. rst-class:: keywords ======== ================ ==== ============================================== KEY Example Value Type Comment ======== ================ ==== ============================================== NAXIS1 335 int length of dimension 1 NAXIS2 338 int length of dimension 2 CHECKSUM PI3dSH0aPH0aPH0a str HDU checksum updated 2022-08-02T00:24:13 DATASUM 72956540 str data unit checksum updated 2022-08-02T00:24:13 ======== ================ ==== ============================================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ======================== ============ ============================ =================================================== Name Type Units Description ======================== ============ ============================ =================================================== TARGETID int64 Unique target ID. SURVEY [1]_ bytes3 Survey name. PROGRAM [1]_ bytes6 Program name. HEALPIX [1]_ int32 Healpixel number. TILEID [2]_ int32 Tile ID number. NIGHT [2]_ int32 Night of observation. FIBER [2]_ int32 Fiber number. EXPID [3]_ int32 Exposure ID number. Z float64 Stellar continuum redshift. COEFF float32[168] Continuum coefficients. RCHI2_PHOT float32 Reduced chi-squared of the fit to the broadband photometry. VDISP float32 km / s Stellar velocity dispersion. AV float32 mag Attenuation of the integrated stellar population. AGE float32 Gyr Light-weighted age. ZZSUN float32 Logarithmic stellar metallicity relative to solar. LOGMSTAR float32 Msun Logarithmic stellar mass (h=1.0, Chabrier+2003 initial mass function). SFR float32 Msun / yr Instantaneous star formation rate (h=1.0, Chabrier+2003 initial mass function). DN4000_MODEL float32 Narrow 4000-A break index (from Balogh et al. 1999) measured from the best-fitting continuum model. FLUX_SYNTH_PHOTMODEL_G float32 nmgy g-band flux synthesized from the best-fitting photometric continuum model. FLUX_SYNTH_PHOTMODEL_R float32 nmgy r-band flux synthesized from the best-fitting photometric continuum model. FLUX_SYNTH_PHOTMODEL_Z float32 nmgy z-band flux synthesized from the best-fitting photometric continuum model. FLUX_SYNTH_PHOTMODEL_W1 float32 nmgy W1-band flux synthesized from the best-fitting photometric continuum model. FLUX_SYNTH_PHOTMODEL_W2 float32 nmgy W2-band flux synthesized from the best-fitting photometric continuum model. FLUX_SYNTH_PHOTMODEL_W3 float32 nmgy W3-band flux synthesized from the best-fitting photometric continuum model. FLUX_SYNTH_PHOTMODEL_W4 float32 nmgy W4-band flux synthesized from the best-fitting photometric continuum model. ABSMAG10_DECAM_G [4]_ float32 mag Absolute magnitude in DECam g-band band-shifted to z=1.0 assuming h=1.0. ABSMAG10_IVAR_DECAM_G float32 1 / mag2 Inverse variance corresponding to ABSMAG10_DECAM_G. KCORR10_DECAM_G float32 mag K-correction used to derive ABSMAG10_DECAM_G band-shifted to z=1.0. ABSMAG10_DECAM_R [4]_ float32 mag Absolute magnitude in DECam r-band band-shifted to z=1.0 assuming h=1.0. ABSMAG10_IVAR_DECAM_R float32 1 / mag2 Inverse variance corresponding to ABSMAG10_DECAM_R. KCORR10_DECAM_R float32 mag K-correction used to derive ABSMAG10_DECAM_R band-shifted to z=1.0. ABSMAG10_DECAM_Z [4]_ float32 mag Absolute magnitude in DECam z-band band-shifted to z=1.0 assuming h=1.0. ABSMAG10_IVAR_DECAM_Z float32 1 / mag2 Inverse variance corresponding to ABSMAG10_DECAM_Z. KCORR10_DECAM_Z float32 mag K-correction used to derive ABSMAG10_DECAM_Z band-shifted to z=1.0. ABSMAG00_U [4]_ float32 mag Absolute magnitude in Johnson/Cousins U-band band-shifted to z=0.0 assuming h=1.0. ABSMAG00_IVAR_U float32 1 / mag2 Inverse variance corresponding to ABSMAG_U. KCORR00_U float32 mag K-correction used to derive ABSMAG_U band-shifted to z=0.0. ABSMAG00_B [4]_ float32 mag Like ABSMAG_U but for Johnson/Cousins B-band. ABSMAG00_IVAR_B float32 1 / mag2 Like ABSMAG_IVAR_U but for Johnson/Cousins B-band. KCORR00_B float32 mag Like KCORR_U but for Johnson/Cousins B-band. ABSMAG00_V [4]_ float32 mag Like ABSMAG_U but for Johnson/Cousins V-band. ABSMAG00_IVAR_V float32 1 / mag2 Like ABSMAG_IVAR_U but for Johnson/Cousins V-band. KCORR00_V float32 mag Like KCORR_U but for Johnson/Cousins V-band. ABSMAG01_SDSS_U [4]_ float32 mag Absolute magnitude in SDSS u-band band-shifted to z=0.1 assuming h=1.0. ABSMAG01_IVAR_SDSS_U float32 1 / mag2 Inverse variance corresponding to ABSMAG_SDSS_U. KCORR01_SDSS_U float32 mag K-correction used to derive ABSMAG_SDSS_U band-shifted to z=0.1. ABSMAG01_SDSS_G [4]_ float32 mag Like ABSMAG_SDSS_U but for SDSS g-band. ABSMAG01_IVAR_SDSS_G float32 1 / mag2 Like ABSMAG_IVAR_SDSS_U but for SDSS g-band. KCORR01_SDSS_G float32 mag Like KCORR_SDSS_U but for SDSS g-band. ABSMAG01_SDSS_R [4]_ float32 mag Like ABSMAG_SDSS_U but for SDSS r-band. ABSMAG01_IVAR_SDSS_R float32 1 / mag2 Like ABSMAG_IVAR_SDSS_U but for SDSS r-band. KCORR01_SDSS_R float32 mag Like KCORR_SDSS_U but for SDSS r-band. ABSMAG01_SDSS_I [4]_ float32 mag Like ABSMAG_SDSS_U but for SDSS i-band. ABSMAG01_IVAR_SDSS_I float32 1 / mag2 Like ABSMAG_IVAR_SDSS_U but for SDSS i-band. KCORR01_SDSS_I float32 mag Like KCORR_SDSS_U but for SDSS i-band. ABSMAG01_SDSS_Z [4]_ float32 mag Like ABSMAG_SDSS_U but for SDSS z-band. ABSMAG01_IVAR_SDSS_Z float32 1 / mag2 Like ABSMAG_IVAR_SDSS_U but for SDSS z-band. KCORR01_SDSS_Z float32 mag Like KCORR_SDSS_U but for SDSS z-band. ABSMAG00_W1 [4]_ float32 mag Absolute magnitude in WISE W1-band band-shifted to z=0.0 assuming h=1.0. ABSMAG00_IVAR_W1 float32 1 / mag2 Inverse variance corresponding to ABSMAG_W1. KCORR00_W1 float32 mag K-correction used to derive ABSMAG_W1 band-shifted to z=0.0. LOGLNU_1500 float32 1e-28 erg / (s Hz) Monochromatic luminosity at 1500 A in the rest-frame. LOGLNU_2800 float32 1e-28 erg / (s Hz) Monochromatic luminosity at 2800 A in the rest-frame. LOGL_1450 float32 1e+10 Lsun Integrated luminosity at 1450 A in the rest-frame. LOGL_1700 float32 1e+10 Lsun Integrated luminosity at 1700 A in the rest-frame. LOGL_3000 float32 1e+10 Lsun Integrated luminosity at 3000 A in the rest-frame. LOGL_5100 float32 1e+10 Lsun Integrated luminosity at 5100 A in the rest-frame. FLYA_1215_CONT float32 1e-17 erg / (Angstrom cm2 s) Continuum flux at 1215.67 A in the rest-frame. FOII_3727_CONT float32 1e-17 erg / (Angstrom cm2 s) Continuum flux at 3728.483 A in the rest-frame. FHBETA_CONT float32 1e-17 erg / (Angstrom cm2 s) Continuum flux at 4862.683 A in the rest-frame. FOIII_5007_CONT float32 1e-17 erg / (Angstrom cm2 s) Continuum flux at 5008.239 A in the rest-frame. FHALPHA_CONT float32 1e-17 erg / (Angstrom cm2 s) Continuum flux at 6564.613 A in the rest-frame. ======================== ============ ============================ =================================================== HDU02 ----- EXTNAME = METADATA Metadata associated with each objected fitted. Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table :open: .. rst-class:: keywords ======== ================ ==== ============================================== KEY Example Value Type Comment ======== ================ ==== ============================================== NAXIS1 339 int length of dimension 1 NAXIS2 338 int length of dimension 2 CHECKSUM iFX6iFW6iFW6iFW6 str HDU checksum updated 2022-08-02T00:24:13 DATASUM 1759692941 str data unit checksum updated 2022-08-02T00:24:13 ======== ================ ==== ============================================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ====================== =========== ========== ========================================== Name Type Units Description ====================== =========== ========== ========================================== TARGETID int64 Unique target ID. SURVEY [1]_ bytes3 Survey name. PROGRAM [1]_ bytes6 Program name. HEALPIX [1]_ int32 Healpixel number. TILEID [2]_ int32 Tile ID number. FIBER [2]_ int32 Fiber number. NIGHT [2]_ int32 Night of observation. EXPID [3]_ int32 Exposure ID number. TILEID_LIST str5 List of tile IDs that went into healpix coadd. RA float64 deg Right ascension from target catalog. DEC float64 deg Declination from target catalog. COADD_FIBERSTATUS int64 Fiber status bit. CMX_TARGET [4]_ int64 Commissioning (CMX) targeting bit. DESI_TARGET int64 DESI targeting bit. BGS_TARGET int64 BGS targeting bit. MWS_TARGET int64 MWS targeting bit. SCND_TARGET int64 Secondary target targeting bit. SV1_DESI_TARGET [5]_ int64 SV1 DESI targeting bit. SV1_BGS_TARGET [5]_ int64 SV1 BGS targeting bit. SV1_MWS_TARGET [5]_ int64 SV1 MWS targeting bit. SV2_DESI_TARGET [5]_ int64 SV2 DESI targeting bit. SV2_BGS_TARGET [5]_ int64 SV2 BGS targeting bit. SV2_MWS_TARGET [5]_ int64 SV2 MWS targeting bit. SV3_DESI_TARGET [5]_ int64 SV3 DESI targeting bit. SV3_BGS_TARGET [5]_ int64 SV3 BGS targeting bit. SV3_MWS_TARGET [5]_ int64 SV3 MWS targeting bit. SV1_SCND_TARGET [5]_ int64 SV1 secondary targeting bit. SV2_SCND_TARGET [5]_ int64 SV2 secondary targeting bit. SV3_SCND_TARGET [5]_ int64 SV3 secondary targeting bit. Z float64 Redshift based on Redrock or QuasarNet (for QSO targets only). ZWARN int8 Redrock zwarning bit. DELTACHI2 float64 Redrock delta-chi-squared. SPECTYPE str6 Redrock spectral classification. Z_RR float64 Redrock redshift. TSNR2_BGS float32 Template signal-to-noise ratio squared for BGS targets. TSNR2_LRG float32 Template signal-to-noise ratio squared for LRG targets. TSNR2_ELG float32 Template signal-to-noise ratio squared for ELG targets. TSNR2_QSO float32 Template signal-to-noise ratio squared for QSO targets. TSNR2_LYA float32 Template signal-to-noise ratio squared for LYA targets. PHOTSYS bytes1 Photometric system (*N* or *S*). LS_ID int64 Unique Legacy Surveys identification number. FIBERFLUX_G float32 nmgy Fiber g-band flux corrected for Galactic extinction. FIBERFLUX_R float32 nmgy Fiber r-band flux corrected for Galactic extinction. FIBERFLUX_Z float32 nmgy Fiber z-band flux corrected for Galactic extinction. FIBERTOTFLUX_G float32 nmgy Fibertot g-band flux corrected for Galactic extinction. FIBERTOTFLUX_R float32 nmgy Fibertot r-band flux corrected for Galactic extinction. FIBERTOTFLUX_Z float32 nmgy Fibertot z-band flux corrected for Galactic extinction. FLUX_G float32 nmgy Total g-band flux corrected for Galactic extinction. FLUX_R float32 nmgy Total r-band flux corrected for Galactic extinction. FLUX_Z float32 nmgy Total z-band flux corrected for Galactic extinction. FLUX_W1 float32 nmgy Total W1-band flux corrected for Galactic extinction. FLUX_W2 float32 nmgy Total W2-band flux corrected for Galactic extinction. FLUX_W3 float32 nmgy Total W3-band flux corrected for Galactic extinction. FLUX_W4 float32 nmgy Total W4-band flux corrected for Galactic extinction. FLUX_IVAR_G float32 1 / nmgy2 Inverse variance of FLUX_G corrected for Galactic extinction. FLUX_IVAR_R float32 1 / nmgy2 Inverse variance of FLUX_R corrected for Galactic extinction. FLUX_IVAR_Z float32 1 / nmgy2 Inverse variance of FLUX_Z corrected for Galactic extinction. FLUX_IVAR_W1 float32 1 / nmgy2 Inverse variance of FLUX_W1 corrected for Galactic extinction. FLUX_IVAR_W2 float32 1 / nmgy2 Inverse variance of FLUX_W2 corrected for Galactic extinction. FLUX_IVAR_W3 float32 1 / nmgy2 Inverse variance of FLUX_W3 corrected for Galactic extinction. FLUX_IVAR_W4 float32 1 / nmgy2 Inverse variance of FLUX_W4 corrected for Galactic extinction. EBV float32 mag Milky Way foreground dust reddening. MW_TRANSMISSION_G float32 Milky Way foreground dust transmission factor [0-1] in the g-band. MW_TRANSMISSION_R float32 Milky Way foreground dust transmission factor [0-1] in the r-band. MW_TRANSMISSION_Z float32 Milky Way foreground dust transmission factor [0-1] in the z-band. MW_TRANSMISSION_W1 float32 Milky Way foreground dust transmission factor [0-1] in the W1-band. MW_TRANSMISSION_W2 float32 Milky Way foreground dust transmission factor [0-1] in the W2-band. MW_TRANSMISSION_W3 float32 Milky Way foreground dust transmission factor [0-1] in the W3-band. MW_TRANSMISSION_W4 float32 Milky Way foreground dust transmission factor [0-1] in the W4-band. ====================== =========== ========== ========================================== .. [1] Column only present when fitting healpix coadds. .. [2] Column only present when fitting cumulative, per-night, or per-expopsure tile-based coadds. .. [3] Column only present when fitting per-exposure tile-based coadds. .. [4] Only observed photometry with a minimum signal-to-noise ratio of two is used to compute K-corrections. Absolute magnitudes are estimated using from the (S/N>2) observed-frame bandpass nearest in wavelength to the desired band-shifted rest-frame bandpass. If no observed-frame photometry is available, then the absolute magnitude is synthesized from the best-fitting model and the corresponding inverse variance is set to zero. .. [5] Column only present in Commissioning and Survey Validation spectroscopic observations.