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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.
KCORR_U float32 mag K-correction used to derive ABSMAG_U band-shifted to z=0.0 assuming h=1.0.
ABSMAG_U float32 mag Absolute magnitude in Johnson/Cousins U-band band-shifted to z=0.0 assuming h=1.0.
ABSMAG_IVAR_U float32 1 / mag2 Inverse variance corresponding to ABSMAG_U.
KCORR_B float32 mag Like KCORR_U but for Johnson/Cousins B-band.
ABSMAG_B float32 mag Like ABSMAG_U but for Johnson/Cousins B-band.
ABSMAG_IVAR_B float32 1 / mag2 Like ABSMAG_IVAR_U but for Johnson/Cousins B-band.
KCORR_V float32 mag Like KCORR_U but for Johnson/Cousins V-band.
ABSMAG_V float32 mag Like ABSMAG_U but for Johnson/Cousins V-band.
ABSMAG_IVAR_V float32 1 / mag2 Like ABSMAG_IVAR_U but for Johnson/Cousins V-band.
KCORR_SDSS_U float32 mag K-correction used to derive ABSMAG_SDSS_U band-shifted to z=0.1 assuming h=1.0.
ABSMAG_SDSS_U float32 mag Absolute magnitude in SDSS u-band band-shifted to z=0.1 assuming h=1.0.
ABSMAG_IVAR_SDSS_U float32 1 / mag2 Inverse variance corresponding to ABSMAG_SDSS_U.
KCORR_SDSS_G float32 mag Like KCORR_SDSS_U but for SDSS g-band.
ABSMAG_SDSS_G float32 mag Like ABSMAG_SDSS_U but for SDSS g-band.
ABSMAG_IVAR_SDSS_G float32 1 / mag2 Like ABSMAG_IVAR_SDSS_U but for SDSS g-band.
KCORR_SDSS_R float32 mag Like KCORR_SDSS_U but for SDSS r-band.
ABSMAG_SDSS_R float32 mag Like ABSMAG_SDSS_U but for SDSS r-band.
ABSMAG_IVAR_SDSS_R float32 1 / mag2 Like ABSMAG_IVAR_SDSS_U but for SDSS r-band.
KCORR_SDSS_I float32 mag Like KCORR_SDSS_U but for SDSS i-band.
ABSMAG_SDSS_I float32 mag Like ABSMAG_SDSS_U but for SDSS i-band.
ABSMAG_IVAR_SDSS_I float32 1 / mag2 Like ABSMAG_IVAR_SDSS_U but for SDSS i-band.
KCORR_SDSS_Z float32 mag Like KCORR_SDSS_U but for SDSS z-band.
ABSMAG_SDSS_Z float32 mag Like ABSMAG_SDSS_U but for SDSS z-band.
ABSMAG_IVAR_SDSS_Z float32 1 / mag2 Like ABSMAG_IVAR_SDSS_U but for SDSS z-band.
KCORR_W1 float32 mag K-correction used to derive ABSMAG_W1 band-shifted to z=0.0 assuming h=1.0.
ABSMAG_W1 float32 mag Absolute magnitude in WISE W1-band band-shifted to z=0.0 assuming h=1.0.
ABSMAG_IVAR_W1 float32 1 / mag2 Inverse variance corresponding to ABSMAG_W1.
KCORR_W2 float32 mag K-correction used to derive ABSMAG_W2 band-shifted to z=0.0 assuming h=1.0.
ABSMAG_W2 float32 mag Absolute magnitude in WISE W2-band band-shifted to z=0.0 assuming h=1.0.
ABSMAG_IVAR_W2 float32 1 / mag2 Inverse variance corresponding to ABSMAG_W2.
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_5100 float32 1e+10 Lsun Total luminosity at 5100 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 [4] int64   SV1 DESI targeting bit.
SV1_BGS_TARGET [4] int64   SV1 BGS targeting bit.
SV1_MWS_TARGET [4] int64   SV1 MWS targeting bit.
SV2_DESI_TARGET [4] int64   SV2 DESI targeting bit.
SV2_BGS_TARGET [4] int64   SV2 BGS targeting bit.
SV2_MWS_TARGET [4] int64   SV2 MWS targeting bit.
SV3_DESI_TARGET [4] int64   SV3 DESI targeting bit.
SV3_BGS_TARGET [4] int64   SV3 BGS targeting bit.
SV3_MWS_TARGET [4] int64   SV3 MWS targeting bit.
SV1_SCND_TARGET [4] int64   SV1 secondary targeting bit.
SV2_SCND_TARGET [4] int64   SV2 secondary targeting bit.
SV3_SCND_TARGET [4] 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](1, 2, 3, 4, 5, 6) Column only present when fitting healpix coadds.
[2](1, 2, 3, 4, 5, 6) Column only present when fitting cumulative, per-night, or per-expopsure tile-based coadds.
[3](1, 2) Column only present when fitting per-exposure tile-based coadds.
[4](1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13) Column only present in Commissioning and Survey Validation spectroscopic observations.