KiDS DR4 file types and formats
Data product types
The following types of data products are provided for each individual tile:
- ugri Coadds: photometrically and astrometrically calibrated, stacked images; 1 per filter per tile; note: used for photometric measurements in multi-band catalog
- ugri Weights: weight frames (1 for each ugri Coadd)
- Flag images: FITS images with pixel flags in areas affected by bright stars (saturated pixels, diffraction spikes, etc.) (1 for each ugri Coadd)
- Source lists: lists of sources detected in single ugri Coadds
- r Detection images: photometrically and astrometrically calibrated, stacked r-band images from lensing-optimized pipeline; note: used for source detection for multi-band catalog
- r Detection weight images: weight frames (1 for each r Detection image)
- 9-band masks: FITS images with pixel flags combining the masks in all 9 bands present in the multi-band catalog
This corresponds to a total of 19114 files and a total data volume of 17 TB.
The multi-band source catalog covers all 1006 tiles, where overlaps between tiles are excised (contrary to the data products listed above), thus making this a single catalog with unique sources. Through the ESO catalog query interface the multi-band catalog can be queried as a single entity. However, for direct download the data are stored in multiple files: a metadata file describing the catalog contents and one (trimmed) catalog data file per tile. The total number of files in which the catalog is stored is therefore 1007 with a total size of 28.5 GB; the catalog contains 100,350,873 sources.
Naming convention
The naming convention used for all data products is the following:
KiDS_DR4.0_R.R_D.D_F_TTT.fits,
where R.R and D.D are the RA and DEC of the tile center in degrees (J2000.0) with 1
decimal place, F is the filter (u, g, r, or i), and TTT is the data product type.
The value of TTT for the different data products is given in column 4 of the table below.
For example: the r-band stacked image of the tile "KIDS_140.0_0.5" is called
KiDS_DR4.0_140.0_0.5_r_sci.fits and the catalog data file of the same tile KiDS_DR4.0_140.0_0.5_ugriZYJHKs_cat.fits.
The following table lists the types of data products provided in this release, together with descriptions of the file types and naming conventions used.
| Data product | ESO product category name | File type | TTT | F |
|---|---|---|---|---|
| Calibrated, stacked images | SCIENCE.IMAGE | FITS image | sci | u,g,r,i |
| Weight frames | ANCILLARY.WEIGHTMAP | FITS image | wei | u,g,r,i |
| Masks | ANCILLARY.MASK | FITS image | msk | u,g,r,i |
| Single-band source lists | SCIENCE.SRCTBL | Binary FITS table | src | u,g,r,i |
| Multi-band catalogue data file | SCIENCE.MCATALOG | Binary FITS table | cat | ugriZYJHKs |
| r-band Detection image | ANCILLARY.IMAGE | FITS image | det_sci | r |
| Detection weight image | ANCILLARY.IMAGE | FITS image | det_wei | r |
| 9-band mask image | ANCILLARY.MASK | FITS image | msk | ugriZYJHKs |
Image data format
The final calibrated, coadded images have a uniform pixel scale of 0.2 arcsec. The pixel units are fluxes relative to the flux corresponding to magnitude = 0. This means that the effective zeropoint is equal to 0 and the magnitude m corresponding to a pixel value f is:
m = -2.5 log10 f.
The gain varies slightly over the field-of-view because of the zeropoint offsets applied to individual CCDs to homogenize the photometry. An average effective gain is provided in the FITS header of each image.
Subsequent photometric zeropoint corrections were derived from the catalogues and recorded in the image headers using the DMAG keyword. The keywords CALSTARS and CALMINAP give the number of Gaia stars that were used in the calibration, and CALMINAP is the value of the GAaP MINAPER parameter (0.7 or 1.0) that was used for the photometry that resulted in this zeropoint.
The r-band detection images, which result from a reduction using THELI, specifically designed for optimal image shape measurement and small astrometric reductions, are the basis of the multi-band catalogue. They have a pixel scale that is closer to the native OmegaCAM pixel size of 0.213".
Single-band catalog columns
The following table lists the columns that are present in the single-band source lists provided in KiDS-ESO-DR4. In the following we provide additional information on certain columns:
- 2DPHOT: KiDS-CAT star/galaxy classification bitmap based on the source morphology (see e.g. de Jong et al., 2015). Values are: 1 = high confidence star candidate; 2 = unreliable source (e.g. cosmic ray); 4 = star according to star/galaxy separation criteria; 0 = all other sources (e.g. including galaxies). Sources identified as stars can thus have a flag value of 1, 4 or 5.
- IMAFLAGS_ISO: Bitmap of mask flags indicating the types of masked areas that intersect with each source's isophotes, as identified by the Pulecenella software (de Jong et al., 2015). Different flag values indicate different types of areas: 1 = readout spike; 2 = saturation core; 4 = diffraction spike; 8 = primary reflection halo; 16 = secondary reflection halo; 32 = tertiary reflection halo; 64 = bad pixel.
- FLUX_APER_* and FLUXERR_APER_*: aperture flux measurements are included for 27 different aperture sizes. In the table only the smallest (2 pixels or 0.4 arcsec diameter) and the largest (200 pixels or 40 arcsec diameter) are listed; the label for the aperture of 28.5 pixels is FLUX_APER_28p5.
| Label | Format | Unit | Description |
|---|---|---|---|
| 2DPHOT | J | Source | classification (see section on star/galaxy separation) |
| X_IMAGE | E | pixel | Object position along x |
| Y_IMAGE | E | pixel | Object position along y |
| NUMBER | J | Running object number | |
| CLASS_STAR | E | S-Extractor S/G classifier | |
| FLAGS | J | Extraction flags | |
| IMAFLAGS_ISO | J | FLAG-image flags OR'ed over the iso. profile | |
| NIMAFLAG_ISO | J | Number of flagged pixels entering | |
| FLUX_RADIUS | E | pixel | Fraction-of-light radii |
| KRON_RADIUS | E | pixel | Kron apertures in units of A or B |
| FWHM_IMAGE | E | pixel | FWHM assuming a gaussian core |
| ISOAREA_IMAGE | J | pixel2 | Isophotal area above Analysis threshold |
| ELLIPTICITY | E | 1 - B_IMAGE/A_IMAGE | |
| THETA_IMAGE | E | deg | Position angle (CCW/x) |
| MAG_AUTO | E | mag | Kron-like elliptical aperture magnitude |
| MAGERR_AUTO | E | mag | RMS error for AUTO magnitude |
| ALPHA_J2000 | D | deg | Right ascension of baryleft (J2000) |
| DELTA_J2000 | D | deg | Declination of baryleft (J2000) |
| FLUX_APER_2 | E | count | Flux vector within circular aperture of 2 pixels |
| ... | ... | ... | ... |
| FLUX_APER_200 | E | count | Flux vector within circular aperture of 200 pixels |
| FLUXERR_APER_2 | E | count | RMS error vector for flux within aperture of 2 pixels |
| ... | ... | ... | ... |
| FLUXERR_APER_200 | E | count | RMS error vector for flux within aperture of 200 pixels |
| MAG_ISO | E | mag | Isophotal magnitude |
| MAGERR_ISO | E | mag | RMS error for isophotal magnitude |
| MAG_ISOCOR | E | mag | Corrected isophotal magnitude |
| MAGERR_ISOCOR | E | mag | RMS error for corrected isophotal magnitude |
| MAG_BEST | E | mag | Best of MAG_AUTO and MAG_ISOCOR |
| MAGERR_BEST | E | mag | RMS error for MAG_BEST |
| BACKGROUND | E | count | Background at centroid position |
| THRESHOLD | E | count | Detection threshold above background |
| MU_THRESHOLD | E | arcsec-2 | Detection threshold above background |
| FLUX_MAX | E | count | Peak flux above background |
| MU_MAX | E | arcsec-2 | Peak surface brightness above background |
| ISOAREA_WORLD | E | deg2 | Isophotal area above Analysis threshold |
| XMIN_IMAGE | J | pixel | Minimum x-coordinate among detected pixels |
| YMIN_IMAGE | J | pixel | Minimum y-coordinate among detected pixels |
| XMAX_IMAGE | J | pixel | Maximum x-coordinate among detected pixels |
| YMAX_IMAGE | J | pixel | Maximum y-coordinate among detected pixels |
| X_WORLD | D | deg | Baryleft position along world x axis |
| Y_WORLD | D | deg | Baryleft position along world y axis |
| XWIN_IMAGE | E | pixel | Windowed position estimate along x |
| YWIN_IMAGE | E | pixel | Windowed position estimate along y |
| X2_IMAGE | D | pixel2 | Variance along x |
| Y2_IMAGE | D | pixel2 | Variance along y |
| XY_IMAGE | D | pixel2 | Covariance between x and y |
| X2_WORLD | E | deg2 | Variance along X-WORLD (alpha) |
| Y2_WORLD | E | deg2 | Variance along Y-WORLD (delta) |
| XY_WORLD | E | deg2 | Covariance between X-WORLD and Y-WORLD |
| CXX_IMAGE | E | pixel-2 | Cxx object ellipse parameter |
| CYY_IMAGE | E | pixel-2 | Cyy object ellipse parameter |
| CXY_IMAGE | E | pixel-2 | Cxy object ellipse parameter |
| CXX_WORLD | E | deg-2 | Cxx object ellipse parameter (WORLD units) |
| CYY_WORLD | E | deg-2 | Cyy object ellipse parameter (WORLD units) |
| CXY_WORLD | E | deg-2 | Cxy object ellipse parameter (WORLD units) |
| A_IMAGE | D | pixel | Profile RMS along major axis |
| B_IMAGE | D | pixel | Profile RMS along minor axis |
| A_WORLD | E | deg | Profile RMS along major axis (WORLD units) |
| B_WORLD | E | deg | Profile RMS along minor axis (WORLD units) |
| THETA_WORLD | E | deg | Position angle (CCW/world-x) |
| THETA_J2000 | E | deg | Position angle (east of north) (J2000) |
| ELONGATION | E | deg | A_IMAGE/B_IMAGE |
| ERRX2_IMAGE | E | pixel2 | Variance of position along x |
| ERRY2_IMAGE | E | pixel2 | Variance of position along y |
| ERRXY_IMAGE | E | pixel2 | Covariance of position between x and y |
| ERRX2_WORLD | E | deg2 | Variance of position along X-WORLD (alpha) |
| ERRY2_WORLD | E | deg2 | Variance of position along Y-WORLD (delta) |
| ERRXY_WORLD | E | deg2 | Covariance of position X-WORLD/Y-WORLD |
| ERRCXX_IMAGE | E | pixel-2 | Cxx error ellipse parameter |
| ERRCYY_IMAGE | E | pixel-2 | Cyy error ellipse parameter |
| ERRCXY_IMAGE | E | pixel-2 | Cxy error ellipse parameter |
| ERRCXX_WORLD | E | deg-2 | Cxx error ellipse parameter (WORLD units) |
| ERRCYY_WORLD | E | deg-2 | Cyy error ellipse parameter (WORLD units) |
| ERRCXY_WORLD | E | deg-2 | Cxy error ellipse parameter (WORLD units) |
| ERRA_IMAGE | E | pixel | RMS position error along major axis |
| ERRB_IMAGE | E | pixel | RMS position error along minor axis |
| ERRA_WORLD | E | deg | World RMS position error along major axis |
| ERRB_WORLD | E | deg | World RMS position error along minor axis |
| ERRTHETA_IMAGE | E | deg | Error ellipse pos. angle (CCW/x) |
| ERRTHETA_WORLD | E | deg | Error ellipse pos. angle (CCW/world-x) |
| ERRTHETA_J2000 | E | deg | J2000 error ellipse pos. angle (east of north) |
| FWHM_WORLD | E | deg | FWHM assuming a gaussian core |
| ISO0 | J | pixel2 | Isophotal area at level 0 |
| ISO1 | J | pixel2 | Isophotal area at level 1 |
| ISO2 | J | pixel2 | Isophotal area at level 2 |
| ISO3 | J | pixel2 | Isophotal area at level 3 |
| ISO4 | J | pixel2 | Isophotal area at level 4 |
| ISO5 | J | pixel2 | Isophotal area at level 5 |
| ISO6 | J | pixel2 | Isophotal area at level 6 |
| ISO7 | J | pixel2 | Isophotal area at level 7 |
| SLID | K | Source list ID | |
| SID | K | Source ID within the source list | |
| HTM | K | Hierarchical Triangular Mesh (level 25) | |
| FLAG | K | Not used |
Multi-band catalog columns
The following table lists the columns that are present in the multi-band source catalog provided in KiDS-ESO-DR4. In the following we provide additional information on certain columns:
- SG2DPHOT: KiDS-CAT star/galaxy classification bitmap based on the r-band Detection image source morphology (see e.g. de Jong et al., 2015). Values are: 1 = high confidence star candidate; 2 = unreliable source (e.g. cosmic ray); 4 = star according to star/galaxy separation criteria; 0 = all other sources (e.g. including galaxies). Sources identified as stars can thus have a flag value of 1, 4 or 5.
- FLUX_GAAP_*_<F>: Gaussian Aperture and Photometry (GAaP) flux of the source in filter <F> for a minimum GAaP aperture of 0.7 arcsec (0p7) or 1.0 arcsec (1p0)
- MAG_GAAP_*_<F>: GAaP magnitude in filter <F> for a minimum GAaP aperture of 0.7 arcsec (0p7) or 1.0 arcsec (1p0); these magnitudes include a zeropoint offset based on the global photometric calibration based on Stellar Locus Regression and tying of the photometry of Gaia DR2 (see Kuijken et al. 2018, in prep.). Please note that they are not total magnitudes, except in the case of unresolved or point sources
MAG_GAAP_*_<F> = -2.5 * log(FLUX_GAAP_*_<F>) + DMAG_<F> - EXTINCTION_<F>: galactic foreground extinction in filter <F> based on the E(B-V) maps from Schlegel, Finkbeiner & Davis (1998, ApJ, 500, 525) and coefficients from Schlafly & Finkbeiner (2011, ApJ. 737, 103)
- MAG_GAAP_<F>: Optimal GAaP magnitude in filter <F>; these magnitudes are for the optimal minimum GAaP aperture determined per source and also include the extinction correction:
MAG_GAAP_<F> = -2.5 * log(FLUX_GAAP_0p7/1p0_<F>) + DMAG_<F> - EXTINCTION_<F> - ODDS: a measure of the uni-modality of the redshift Probability Distribution Function; a higher value indicates a higher reliability of the best photo-z estimate.
- T_B: the best-fit spectral template for each source; these values correspond to the following types, where fractional types can occur because the templates are interpolated: 1=CWW-Ell, 2=CWW-Sbc, 3=CWW-Scd, 4=CWW-Im, 5=KIN-SB3, 6=KIN-SB2 (Capak, 2004, PhD. thesis, Univ. Hawai'i)
- MASK: bit value of the multi-band mask at the location of the source
- COLOUR_GAAP_<F1>_<F2>: optimal <F1>-<F2> colour for the source; these colours are corrected for extinction
| Label | Format | Unit | Description |
|---|---|---|---|
| General Source Parameters Derived from r-band THELI Detection Image | |||
| ID | 30A | Source ID | |
| SeqNr | 1J | Running object number within the catalogue | |
| SLID | 1J | AstroWise Source list ID | |
| SID | 1J | AstroWise Source ID within the source list | |
| FLUX_AUTO | 1E | count | r-band flux (counts) |
| FLUXERR_AUTO | 1E | count | Error on FLUX_AUTO (counts) |
| MAG_AUTO | 1E | mag | r-band magnitude (mag) |
| MAGERR_AUTO | 1E | mag | Error on MAG_AUTO (mag) |
| KRON_RADIUS | 1E | pixel | Scaling radius of the ellipse for magnitude measurements |
| BackGr | 1E | count | Background counts at centroid position (counts) |
| Level | 1E | count | Detection threshold above background (counts) |
| MU_THRESHOLD | 1E | mag*arcsec**(-2) | Detection threshold above background (mag arcsec^-2) |
| MaxVal | 1E | count | Peak flux above background (counts) |
| MU_MAX | 1E | mag*arcsec**(-2) | Peak surface brightness above background (mag arcsec^-2) |
| ISOAREA_WORLD | 1E | deg**2 | Isophotal area above analysis threshold (deg^2) |
| Xpos | 1E | pixel | Centroid x position in the THELI image (pix) |
| Ypos | 1E | pixel | Centroid y position in the THELI image (pix) |
| RAJ2000 | 1D | deg | Centroid sky position right ascension (J2000) (deg) |
| DECJ2000 | 1D | deg | Centroid sky position declination (J2000) (deg) |
| A_WORLD | 1E | deg | Profile RMS along major axis (deg) |
| B_WORLD | 1E | deg | Profile RMS along minor axis (deg) |
| THETA_J2000 | 1E | deg | Position angle (West of North) (deg) |
| THETA_WORLD | 1E | deg | Position angle (Counterclockwise from world x-axis (deg) |
| ERRA_WORLD | 1E | deg | World RMS position error along major axis (deg) |
| ERRB_WORLD | 1E | deg | World RMS position error along minor axis (deg) |
| ERRTHETA_J2000 | 1E | deg | Error on THETA_J2000 (deg) |
| ERRTHETA_WORLD | 1E | deg | Error on THETA_WORLD (deg) |
| FWHM_IMAGE | 1E | pixel | FWHM assuming a gaussian object profile (pix) |
| FWHM_WORLD | 1E | deg | FWHM assuming a gaussian object profile (deg) |
| Flag | 1I | SExtractor extraction flags | |
| FLUX_RADIUS | 1E | pixel | Half-light radius (pix) |
| CLASS_STAR | 1E | Star-galaxy classifier | |
| GAaP photometry parameters from Astro-WISE co-added u,g,r,i images | |||
| EXTINCTION_u | 1E | mag | Galactic extinction in the u band (mag) |
| EXTINCTION_g | 1E | mag | Galactic extinction in the g band (mag) |
| EXTINCTION_r | 1E | mag | Galactic extinctio in the r band (mag) |
| EXTINCTION_i | 1E | mag | Galactic extincion in the i band (mag) |
| Agaper_0p7 | 1E | arcsec | Major axis of GAaP aperture minaper 0.7arcs (arcsec) |
| Bgaper_0p7 | 1E | arcsec | Minor axis of GAaP aperture minaper 0.7arcs (arcsec) |
| Agaper_1p0 | 1E | arcsec | Major axis of GAaP aperture minaper 1.0arcs (arcsec) |
| Bgaper_1p0 | 1E | arcsec | Minor axis of GAaP aperture minaper 1.0arcs (arcsec) |
| PAgaap | 1E | deg | Position angle of major axis of GAaP aperture (North of West) (deg) |
| FLAG_GAAP_0p7_u | 1J | GAaP Flag for MAG_GAAP_u minaper 0.7arcs | |
| FLAG_GAAP_0p7_g | 1J | GAaP Flag for MAG_GAAP_g minaper 0.7arcs | |
| FLAG_GAAP_0p7_r | 1J | GAaP Flag for MAG_GAAP_r minaper 0.7arcs | |
| FLAG_GAAP_0p7_i | 1J | GAaP Flag for MAG_GAAP_i minaper 0.7arcs | |
| FLUX_GAAP_0p7_u | 1E | count | GAAP u-band flux minaper 0.7arcs (counts) |
| FLUX_GAAP_0p7_g | 1E | count | GAAP g-band flux minaper 0.7arcs (counts) |
| FLUX_GAAP_0p7_r | 1E | count | GAAP r-band flux minaper 0.7arcs (counts) |
| FLUX_GAAP_0p7_i | 1E | count | GAAP i-band flux minaper 0.7arcs (counts) |
| FLUXERR_GAAP_0p7_u | 1E | count | Error on FLUX_GAAP_u minaper 0.7arcs (counts) |
| FLUXERR_GAAP_0p7_g | 1E | count | Error on FLUX_GAAP_g minaper 0.7arcs (counts) |
| FLUXERR_GAAP_0p7_r | 1E | count | Error on FLUX_GAAP_r minaper 0.7arcs (counts) |
| FLUXERR_GAAP_0p7_i | 1E | count | Error on FLUX_GAAP_i minaper 0.7arcs (counts) |
| FLAG_GAAP_1p0_u | 1J | GAaP Flag for MAG_GAAP_u minaper 1.0arcs | |
| FLAG_GAAP_1p0_g | 1J | GAaP Flag for MAG_GAAP_g minaper 1.0arcs | |
| FLAG_GAAP_1p0_r | 1J | GAaP Flag for MAG_GAAP_r minaper 1.0arcs | |
| FLAG_GAAP_1p0_i | 1J | GAaP Flag for MAG_GAAP_i minaper 1.0arcs | |
| FLUX_GAAP_1p0_u | 1E | count | GAAP u-band flux minaper 1.0arcs (counts) |
| FLUX_GAAP_1p0_g | 1E | count | GAAP g-band flux minaper 1.0arcs (counts) |
| FLUX_GAAP_1p0_r | 1E | count | GAAP r-band flux minaper 1.0arcs (counts) |
| FLUX_GAAP_1p0_i | 1E | count | GAAP i-band flux minaper 1.0arcs (counts) |
| FLUXERR_GAAP_1p0_u | 1E | count | Error on FLUX_GAAP_u minaper 1.0arcs (counts) |
| FLUXERR_GAAP_1p0_g | 1E | count | Error on FLUX_GAAP_g minaper 1.0arcs (counts) |
| FLUXERR_GAAP_1p0_r | 1E | count | Error on FLUX_GAAP_r minaper 1.0arcs (counts) |
| FLUXERR_GAAP_1p0_i | 1E | count | Error on FLUX_GAAP_i minaper 1.0arcs (counts) |
| MAG_GAAP_0p7_u | 1E | mag | u-band GAaP magnitude min_aper=0.7arcsec |
| MAGERR_GAAP_0p7_u | 1E | mag | u-band GAaP magnitude error min_aper=0.7arcsec |
| MAG_GAAP_0p7_g | 1E | mag | g-band GAaP magnitude min_aper=0.7arcsec |
| MAGERR_GAAP_0p7_g | 1E | mag | g-band GAaP magnitude error min_aper=0.7arcsec |
| MAG_GAAP_0p7_r | 1E | mag | r-band GAaP magnitude min_aper=0.7arcsec |
| MAGERR_GAAP_0p7_r | 1E | mag | r-band GAaP magnitude error min_aper=0.7arcsec |
| MAG_GAAP_0p7_i | 1E | mag | i-band GAaP magnitude min_aper=0.7arcsec |
| MAGERR_GAAP_0p7_i | 1E | mag | i-band GAaP magnitude error min_aper=0.7arcsec |
| MAG_GAAP_1p0_u | 1E | mag | u-band GAaP magnitude min_aper=1.0arcsec |
| MAGERR_GAAP_1p0_u | 1E | mag | u-band GAaP magnitude error min_aper=1.0arcsec |
| MAG_GAAP_1p0_g | 1E | mag | g-band GAaP magnitude min_aper=1.0arcsec |
| MAGERR_GAAP_1p0_g | 1E | mag | g-band GAaP magnitude error min_aper=1.0arcsec |
| MAG_GAAP_1p0_r | 1E | mag | r-band GAaP magnitude min_aper=1.0arcsec |
| MAGERR_GAAP_1p0_r | 1E | mag | r-band GAaP magnitude error min_aper=1.0arcsec |
| MAG_GAAP_1p0_i | 1E | mag | i-band GAaP magnitude min_aper=1.0arcsec |
| MAGERR_GAAP_1p0_i | 1E | mag | i-band GAaP magnitude error min_aper=1.0arcsec |
| Suppementary Source Parameters from THELI r-band Detection Image | |||
| MAG_ISO | 1E | mag | r-band Isophotal Magnitude (mag) |
| MAGERR_ISO | 1E | mag | Error on MAG_ISO (mag) |
| FLUX_ISO | 1E | count | r-band Isophotal Flux (counts) |
| FLUXERR_ISO | 1E | count | Error on FLUX_ISO (counts) |
| MAG_ISOCOR | 1E | mag | r-band Corrected Isophotal Magnitude (mag) |
| MAGERR_ISOCOR | 1E | mag | Error on MAG_ISOCOR (mag) |
| FLUX_ISOCOR | 1E | count | r-band Corrected Isophotal Flux (counts) |
| FLUXERR_ISOCOR | 1E | count | Error on FLUX_ISOCOR (counts) |
| NIMAFLAGS_ISO | 1I | Number of flagged pixels over the isophotal profile | |
| IMAFLAGS_ISO | 1I | FLAG-image flags ORed over the isophotal profile | |
| XMIN_IMAGE | 1I | pixel | Minimum x-coordinate among detected pixels (pixel) |
| YMIN_IMAGE | 1I | pixel | Minimum y-coordinate among detected pixels (pixel) |
| XMAX_IMAGE | 1I | pixel | Maximum x-coordinate among detected pixels (pixel) |
| YMAX_IMAGE | 1I | pixel | Maximum x-coordinate among detected pixels (pixel) |
| X_WORLD | 1D | deg | Barycentre position along world x axis (deg) |
| Y_WORLD | 1D | deg | Barycentre position along world y axis (deg) |
| X2_WORLD | 1E | deg**2 | Variance of position along X_WORLD (alpha) (deg^2) |
| Y2_WORLD | 1E | deg**2 | Variance of position along X_WORLD (delta) (deg^2) |
| XY_WORLD | 1E | deg**2 | Covariance of position X_WORLDY_WORLD (deg^2) / |
| ERRX2_WORLD | 1E | deg**2 | Error on XY_WORLD (deg^2) |
| ERRY2_WORLD | 1E | deg**2 | Error on XY_WORLD (deg^2) |
| ERRXY_WORLD | 1E | deg**2 | Error on XY_WORLD (deg^2) |
| CXX_WORLD | 1E | deg**(-2) | SExtractor Cxx object ellipse parameter (deg^-2) |
| CYY_WORLD | 1E | deg**(-2) | SExtractor Cyy object ellipse parameter (deg^-2) |
| CXY_WORLD | 1E | deg**(-2) | SExtractor Cxy object ellipse parameter (deg^-2) |
| ERRCXX_WORLD | 1E | deg**(-2) | Error on CXX_WORLD (deg^-2) |
| ERRCYY_WORLD | 1E | deg**(-2) | Error on CYY_WORLD (deg^-2) |
| ERRCXY_WORLD | 1E | deg**(-2) | Error on CXY_WORLD (deg^-2) |
| A_IMAGE | 1D | pixel | Profile RMS along x-axis (pix) |
| B_IMAGE | 1D | pixel | Profile RMS along y-axis (pix) |
| ERRA_IMAGE | 1E | pixel | Error on A_IMAGE |
| ERRB_IMAGE | 1E | pixel | Error on B_IMAGE |
| S_ELLIPTICITY | 1E | SExtractor Ellipticity (1-B_IMAGEA_IMAGE) / | |
| S_ELONGATION | 1E | SExtractor Elongation (A_IMAGEB_IMAGE) / | |
| MAG_APER_4 | 1E | mag | r-band Magnitude within a circular aperture of 4 pixels (mag) |
| MAGERR_APER_4 | 1E | mag | Error on MAG_APER_4 (mag) |
| FLUX_APER_4 | 1E | count | r-band Flux within a circular aperture of 4 pixels (counts) |
| FLUXERR_APER_4 | 1E | count | Error on FLUX_APER_4 (counts) |
| MAG_APER_6 | 1E | mag | r-band Magnitude within a circular aperture of 6 pixels (mag) |
| MAGERR_APER_6 | 1E | mag | Error on MAG_APER_6 (mag) |
| FLUX_APER_6 | 1E | count | r-band Flux within a circular aperture of 6 pixels (counts) |
| FLUXERR_APER_6 | 1E | count | Error on FLUX_APER_6 (counts) |
| MAG_APER_8 | 1E | mag | r-band Magnitude within a circular aperture of 8 pixels (mag) |
| MAGERR_APER_8 | 1E | mag | Error on MAG_APER_8 (mag) |
| FLUX_APER_8 | 1E | count | r-band Flux within a circular aperture of 8 pixels (counts) |
| FLUXERR_APER_8 | 1E | count | Error on FLUX_APER_8 (counts) |
| MAG_APER_10 | 1E | mag | r-band Magnitude within a circular aperture of 10 pixels (mag) |
| MAGERR_APER_10 | 1E | mag | Error on MAG_APER_10 (mag) |
| FLUX_APER_10 | 1E | count | r-band Flux within a circular aperture of 10 pixels (counts) |
| FLUXERR_APER_10 | 1E | count | Error on FLUX_APER_10 (counts) |
| MAG_APER_14 | 1E | mag | r-band Magnitude within a circular aperture of 14 pixels (mag) |
| MAGERR_APER_14 | 1E | mag | Error on MAG_APER_14 (mag) |
| FLUX_APER_14 | 1E | count | r-band Flux within a circular aperture of 14 pixels (counts) |
| FLUXERR_APER_14 | 1E | count | Error on FLUX_APER_14 (counts) |
| MAG_APER_20 | 1E | mag | r-band Magnitude within a circular aperture of 20 pixels (mag) |
| MAGERR_APER_20 | 1E | mag | Error on MAG_APER_20 (mag) |
| FLUX_APER_20 | 1E | count | r-band Flux within a circular aperture of 20 pixels (counts) |
| FLUXERR_APER_20 | 1E | count | Error on FLUX_APER_20 (counts) |
| MAG_APER_30 | 1E | mag | r-band Magnitude within a circular aperture of 30 pixels (mag) |
| MAGGERR_APER_30 | 1E | mag | Error on MAG_APER_30 (mag) |
| FLUXERR_APER_30 | 1E | count | r-band Flux within a circular aperture of 30 pixels (counts) |
| FLUX_APER_30 | 1E | count | Error on FLUX_APER_30 (counts) |
| MAG_APER_40 | 1E | mag | r-band Magnitude within a circular aperture of 40 pixels (mag) |
| MAGERR_APER_40 | 1E | mag | Error on MAG_APER_40 (mag) |
| FLUX_APER_40 | 1E | count | r-band Flux within a circular aperture of 40 pixels (counts) |
| FLUXERR_APER_40 | 1E | count | Error on FLUX_APER_40 (counts) |
| MAG_APER_60 | 1E | mag | r-band Magnitude within a circular aperture of 60 pixels (mag) |
| MAGERR_APER_60 | 1E | mag | Error on MAG_APER_60 (mag) |
| FLUX_APER_60 | 1E | count | r-band Flux within a circular aperture of 60 pixels (counts) |
| FLUXERR_APER_60 | 1E | count | Error on FLUX_APER_60 (counts) |
| MAG_APER_100 | 1E | mag | r-band Magnitude within a circular aperture of 100 pixels (mag) |
| MAGERR_APER_100 | 1E | mag | Error on MAG_APER_100 (mag) |
| FLUX_APER_100 | 1E | count | r-band Flux within a circular aperture of 100 pixels (counts) |
| FLUXERR_APER_100 | 1E | count | Error on FLUX_APER_100 (counts) |
| ISO0 | 1I | pixel**2 | Isophotal area at level 0 (pixel^2) |
| ISO1 | 1I | pixel**2 | Isophotal area at level 1 (pixel^2) |
| ISO2 | 1I | pixel**2 | Isophotal area at level 2 (pixel^2) |
| ISO3 | 1I | pixel**2 | Isophotal area at level 3 (pixel^2) |
| ISO4 | 1I | pixel**2 | Isophotal area at level 4 (pixel^2) |
| ISO5 | 1I | pixel**2 | Isophotal area at level 5 (pixel^2) |
| ISO6 | 1I | pixel**2 | Isophotal area at level 6 (pixel^2) |
| ISO7 | 1I | pixel**2 | Isophotal area at level 7 (pixel^2) |
| ALPHA_J2000 | 1D | deg | SExtractor named Centroid sky position right ascension (J2000) (deg) |
| DELTA_J2000 | 1D | deg | SEXtractor named Centroid sky position declination (J2000) (deg) |
| SG2DPHOT | 1I | 2DPhot StarGalaxy classifier (1 for high confidence star) | |
| HTM | 1J | Hierarchical Triangular Mesh (level 25) | |
| FIELD_POS | 1I | Reference number to field parameters | |
| THELI_NAME | 14A | Name of the pointing in THELI convention | |
| KIDS_TILE | 14A | Name of the pointing in AW convention | |
| GAaP photometry parameters from the VIKING Z,Y,J,H,Ks pawprints | |||
| EXTINCTION_Z | 1E | mag | Galactic extinction in the Z band (mag) |
| EXTINCTION_Y | 1E | mag | Galactic extinction in the Y band (mag) |
| EXTINCTION_J | 1E | mag | Galactic extinction in the J band (mag) |
| EXTINCTION_H | 1E | mag | Galactic extinction in the H band (mag) |
| EXTINCTION_Ks | 1E | mag | Galactic extinction in the Ks band (mag) |
| MAG_GAAP_0p7_Z | 1E | mag | Z magnitude |
| MAGERR_GAAP_0p7_Z | 1E | mag | Z magnitude error |
| FLUX_GAAP_0p7_Z | 1E | count | Z flux |
| FLUXERR_GAAP_0p7_Z | 1E | count | Z flux error |
| FLAG_GAAP_0p7_Z | 1I | GAAP photometry Flag | |
| MAG_GAAP_1p0_Z | 1E | mag | Z magnitude |
| MAGERR_GAAP_1p0_Z | 1E | mag | Z magnitude error |
| FLUX_GAAP_1p0_Z | 1E | count | Z flux |
| FLUXERR_GAAP_1p0_Z | 1E | count | Z flux error |
| FLAG_GAAP_1p0_Z | 1I | GAAP photometry Flag | |
| MAG_GAAP_0p7_Y | 1E | mag | Y magnitude |
| MAGERR_GAAP_0p7_Y | 1E | mag | Y magnitude error |
| FLUX_GAAP_0p7_Y | 1E | count | Y flux |
| FLUXERR_GAAP_0p7_Y | 1E | count | Y flux error |
| FLAG_GAAP_0p7_Y | 1I | GAAP photometry Flag | |
| MAG_GAAP_1p0_Y | 1E | mag | Y magnitude |
| MAGERR_GAAP_1p0_Y | 1E | mag | Y magnitude error |
| FLUX_GAAP_1p0_Y | 1E | count | Y flux |
| FLUXERR_GAAP_1p0_Y | 1E | count | Y flux error |
| FLAG_GAAP_1p0_Y | 1I | GAAP photometry Flag | |
| MAG_GAAP_0p7_J | 1E | mag | J magnitude |
| MAGERR_GAAP_0p7_J | 1E | mag | J magnitude error |
| FLUX_GAAP_0p7_J | 1E | count | J flux |
| FLUXERR_GAAP_0p7_J | 1E | count | J flux error |
| FLAG_GAAP_0p7_J | 1I | GAAP photometry Flag | |
| MAG_GAAP_1p0_J | 1E | mag | J magnitude |
| MAGERR_GAAP_1p0_J | 1E | mag | J magnitude error |
| FLUX_GAAP_1p0_J | 1E | count | J flux |
| FLUXERR_GAAP_1p0_J | 1E | count | J flux error |
| FLAG_GAAP_1p0_J | 1I | GAAP photometry Flag | |
| MAG_GAAP_0p7_H | 1E | mag | H magnitude |
| MAGERR_GAAP_0p7_H | 1E | mag | H magnitude error |
| FLUX_GAAP_0p7_H | 1E | count | H flux |
| FLUXERR_GAAP_0p7_H | 1E | count | H flux error |
| FLAG_GAAP_0p7_H | 1I | GAAP photometry Flag | |
| MAG_GAAP_1p0_H | 1E | mag | H magnitude |
| MAGERR_GAAP_1p0_H | 1E | mag | H magnitude error |
| FLUX_GAAP_1p0_H | 1E | count | H flux |
| FLUXERR_GAAP_1p0_H | 1E | count | H flux error |
| FLAG_GAAP_1p0_H | 1I | GAAP photometry Flag | |
| MAG_GAAP_0p7_Ks | 1E | mag | Ks magnitude |
| MAGERR_GAAP_0p7_Ks | 1E | mag | Ks magnitude error |
| FLUX_GAAP_0p7_Ks | 1E | count | Ks flux |
| FLUXERR_GAAP_0p7_Ks | 1E | count | Ks flux error |
| FLAG_GAAP_0p7_Ks | 1I | GAAP photometry Flag | |
| MAG_GAAP_1p0_Ks | 1E | mag | Ks magnitude |
| MAGERR_GAAP_1p0_Ks | 1E | mag | Ks magnitude error |
| FLUX_GAAP_1p0_Ks | 1E | count | Ks flux |
| FLUXERR_GAAP_1p0_Ks | 1E | count | Ks flux error |
| FLAG_GAAP_1p0_Ks | 1I | GAAP photometry Flag | |
| Optimal aperture 9-band GaaP photometry | |||
| MAG_GAAP_u | 1E | mag | u-band GAaP magnitude optimal min_aper |
| MAGERR_GAAP_u | 1E | mag | u-band GAaP magnitude error optimal min_aper |
| FLUX_GAAP_u | 1E | count | u-band GAaP flux optimal min_aper |
| FLUXERR_GAAP_u | 1E | count | u-band GAaP flux error optimal min_aper |
| FLAG_GAAP_u | 1I | GAaP Flag for MAG_GAAP_u optimal min_aper | |
| MAG_GAAP_g | 1E | mag | g-band GAaP magnitude optimal min_aper |
| MAGERR_GAAP_g | 1E | mag | g-band GAaP magnitude error optimal min_aper |
| FLUX_GAAP_g | 1E | count | g-band GAaP flux optimal min_aper |
| FLUXERR_GAAP_g | 1E | count | g-band GAaP flux error optimal min_aper |
| FLAG_GAAP_g | 1I | GAaP Flag for MAG_GAAP_g optimal min_aper | |
| MAG_GAAP_r | 1E | mag | r-band GAaP magnitude optimal min_aper |
| MAGERR_GAAP_r | 1E | mag | r-band GAaP magnitude error optimal min_aper |
| FLUX_GAAP_r | 1E | count | r-band GAaP flux optimal min_aper |
| FLUXERR_GAAP_r | 1E | count | r-band GAaP flux error optimal min_aper |
| FLAG_GAAP_r | 1I | GAaP Flag for MAG_GAAP_r optimal min_aper | |
| MAG_GAAP_i | 1E | mag | i-band GAaP magnitude optimal min_aper |
| MAGERR_GAAP_i | 1E | mag | i-band GAaP magnitude error optimal min_aper |
| FLUX_GAAP_i | 1E | count | i-band GAaP flux optimal min_aper |
| FLUXERR_GAAP_i | 1E | count | i-band GAaP flux error optimal min_aper |
| FLAG_GAAP_i | 1I | GAaP Flag for MAG_GAAP_i optimal min_aper | |
| MAG_GAAP_Z | 1E | mag | Z-band GAaP magnitude optimal min_aper |
| MAGERR_GAAP_Z | 1E | mag | Z-band GAaP magnitude error optimal min_aper |
| FLUX_GAAP_Z | 1E | count | Z-band GAaP flux optimal min_aper |
| FLUXERR_GAAP_Z | 1E | count | Z-band GAaP flux error optimal min_aper |
| FLAG_GAAP_Z | 1I | GAaP Flag for MAG_GAAP_Z optimal min_aper | |
| MAG_GAAP_Y | 1E | mag | Y-band GAaP magnitude optimal min_aper |
| MAGERR_GAAP_Y | 1E | mag | Y-band GAaP magnitude error optimal min_aper |
| FLUX_GAAP_Y | 1E | count | Y-band GAaP flux optimal min_aper |
| FLUXERR_GAAP_Y | 1E | count | Y-band GAaP flux error optimal min_aper |
| FLAG_GAAP_Y | 1I | GAaP Flag for MAG_GAAP_Y optimal min_aper | |
| MAG_GAAP_J | 1E | mag | J-band GAaP magnitude optimal min_aper |
| MAGERR_GAAP_J | 1E | mag | J-band GAaP magnitude error optimal min_aper |
| FLUX_GAAP_J | 1E | count | J-band GAaP flux optimal min_aper |
| FLUXERR_GAAP_J | 1E | count | J-band GAaP flux error optimal min_aper |
| FLAG_GAAP_J | 1I | GAaP Flag for MAG_GAAP_J optimal min_aper | |
| MAG_GAAP_H | 1E | mag | H-band GAaP magnitude optimal min_aper |
| MAGERR_GAAP_H | 1E | mag | H-band GAaP magnitude error optimal min_aper |
| FLUX_GAAP_H | 1E | count | H-band GAaP flux optimal min_aper |
| FLUXERR_GAAP_H | 1E | count | H-band GAaP flux error optimal min_aper |
| FLAG_GAAP_H | 1I | GAaP Flag for MAG_GAAP_H optimal min_aper | |
| MAG_GAAP_Ks | 1E | mag | Ks-band GAaP magnitude optimal min_aper |
| MAGERR_GAAP_Ks | 1E | mag | Ks-band GAaP magnitude error optimal min_aper |
| FLUX_GAAP_Ks | 1E | count | Ks-band GAaP flux optimal min_aper |
| FLUXERR_GAAP_Ks | 1E | count | Ks-band GAaP flux error optimal min_aper |
| FLAG_GAAP_Ks | 1I | GAaP Flag for MAG_GAAP_Ks optimal min_aper | |
| Agaper | 1E | arcsec | Major axis of GAaP aperture optimal min_aper (arcsec) |
| Bgaper | 1E | arcsec | Minor axis of GAaP aperture optimal min_aper (arcsec) |
| Photometric redshift estimate | |||
| Z_B | 1D | 9-band BPZ redshift estimate; peak of posterior probability distribution | |
| Z_B_MIN | 1D | Lower bound of the 68% confidence interval of Z_B | |
| Z_B_MAX | 1D | Upper bound of the 68% confidence interval of Z_B | |
| T_B | 1D | Spectral type corresponding to Z_B | |
| ODDS | 1D | Empirical ODDS of Z_B | |
| Z_ML | 1D | 9-band BPZ maximum likelihood redshift | |
| T_ML | 1D | Spectral type corresponding to Z_ML | |
| CHI_SQUARED_BPZ | 1D | chi sqared value associated with Z_B | |
| M_0 | 1D | mag | Reference magnitude for BPZ prior |
| BPZ_FILT | 1J | filters with good photometry (BPZ) | |
| NBPZ_FILT | 1J | number of filters with good phot. (BPZ) | |
| BPZ_NONDETFILT | 1J | filters with faint photometry (BPZ) | |
| NBPZ_NONDETFILT | 1J | number of filters with faint phot. (BPZ) | |
| BPZ_FLAGFILT | 1J | flagged filters (BPZ) | |
| NBPZ_FLAGFILT | 1J | number of flagged filters (BPZ) | |
| MASK | 1J | 9-band mask information | |
| Extinction-corrected colours | |||
| COLOUR_GAAP_u_g | 1E | mag | u-g colour index |
| COLOUR_GAAP_g_r | 1E | mag | g-r colour index |
| COLOUR_GAAP_r_i | 1E | mag | r-i colour index |
| COLOUR_GAAP_i_Z | 1E | mag | i-Z colour index |
| COLOUR_GAAP_Z_Y | 1E | mag | Z-Y colour index |
| COLOUR_GAAP_Y_J | 1E | mag | Y-J colour index |
| COLOUR_GAAP_J_H | 1E | mag | J-H colour index |
| COLOUR_GAAP_H_Ks | 1E | mag | H-Ks colour index |
Multi-band mask format
MASK values in the multi-band catalog.
| Bit | Meaning |
|---|---|
| 0 | THELI manual mask (very conservative) |
| 1 | THELI automatic large star halo mask (faint) |
| 2 | THELI automatic large star halo mask (bright) or bright star mask |
| 3 | Manual mask of regions around globular clusters, Fornax dwarf, ISS passage |
| 4 | THELI void mask, or asteroids, or weight=0 |
| 5 | VIKING Z-band image masked |
| 6 | VIKING Y-band image masked |
| 7 | VIKING J-band image masked |
| 8 | VIKING H-band image masked |
| 9 | VIKING Ks-band image masked |
| 10 | Astro-WISE u-band halo+stellar PULECENELLA mask or weight=0 |
| 11 | Astro-WISE g-band halo+stellar PULECENELLA mask or weight=0 |
| 12 | Astro-WISE r-band halo+stellar PULECENELLA mask or weight=0 |
| 13 | Astro-WISE i-band halo+stellar PULECENELLA mask or weight=0 |
| 14 | Object outside the RA/DEC cut for this tile |
| 15 | Not used (reserved as sign bit in FITS 2-byte integer) |