The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees

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Volume 625 (May 2019)

A&A, 625 (2019) A2

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Table A.4.

Columns provided in the nine-band catalogue.

Label	Unit	Format	Description
`ID`		30A	ESO ID
`SeqNr`		1J	Running object number within the catalogue
`SLID`		1J	ASTRO-WISE Source list ID
`SID`		1J	ASTRO-WISE Source ID within the source list
`THELI_NAME`		14A	Name of the pointing in THELI convention
`KIDS_TILE`		14A	Name of the pointing in ASTRO-WISE convention
Parameters derived from the THELI r-band detection image:
`FLUX_AUTO`	count	1E	r-band flux
`FLUXERR_AUTO`	count	1E	Error on `FLUX_AUTO`
`MAG_AUTO`	mag	1E	r-band magnitude
`MAGERR_AUTO`	mag	1E	Error on `MAG_AUTO`
`KRON_RADIUS`	pixel	1E	Scaling radius of the ellipse for magnitude measurements
`BackGr`	count	1E	Background counts at centroid position
`Level`	count	1E	Detection threshold above background
`MU_THRESHOLD`	mag ⋅ arcsec⁻²	1E	Detection threshold above background
`MaxVal`	count	1E	Peak flux above background
`MU_MAX`	mag ⋅ arcsec⁻²	1E	Peak surface brightness above background
`ISOAREA_WORLD`	deg²	1E	Isophotal area above analysis threshold
`Xpos`	pixel	1E	Centroid x position in the THELI image
`Ypos`	pixel	1E	Centroid y position in the THELI image
`RAJ2000`	deg	1D	Centroid sky position right ascension (J2000)
`DECJ2000`	deg	1D	Centroid sky position declination (J2000)
`A_WORLD`	deg	1E	Profile RMS along major axis
`B_WORLD`	deg	1E	Profile RMS along minor axis
`THETA_J2000`	deg	1E	Position angle (West of North)
`THETA_WORLD`	deg	1E	Position angle (Counterclockwise from world x-axis)
`ERRA_WORLD`	deg	1E	World RMS position error along major axis
`ERRB_WORLD`	deg	1E	World RMS position error along minor axis
`ERRTHETA_J2000`	deg	1E	Error on `THETA_J2000`
`ERRTHETA_WORLD`	deg	1E	Error on `THETA_WORLD`
`FWHM_IMAGE`	pixel	1E	FWHM assuming a gaussian object profile
`FWHM_WORLD`	deg	1E	FWHM assuming a gaussian object profile
`Flag`		1I	SExtractor extraction flags
`FLUX_RADIUS`	pixel	1E	Half-light radius
`CLASS_STAR`		1E	Star-galaxy classifier
`MAG_ISO`	mag	1E	r-band Isophotal Magnitude
`MAGERR_ISO`	mag	1E	Error on `MAG_ISO`
`FLUX_ISO`	count	1E	r-band Isophotal Flux
`FLUXERR_ISO`	count	1E	Error on `FLUX_ISO`
`MAG_ISOCOR`	mag	1E	r-band Corrected Isophotal Magnitude
`MAGERR_ISOCOR`	mag	1E	Error on `MAG_ISOCOR`
`FLUX_ISOCOR`	count	1E	r-band Corrected Isophotal Flux
`FLUXERR_ISOCOR`	count	1E	Error on `FLUX_ISOCOR`
`NIMAFLAGS_ISO`		1I	Number of flagged pixels over the isophotal profile
`IMAFLAGS_ISO`		1I	FLAG-image flags ORed over the isophotal profile
`XMIN_IMAGE`	pixel	1I	Minimum x-coordinate among detected pixels
`YMIN_IMAGE`	pixel	1I	Minimum y-coordinate among detected pixels
`XMAX_IMAGE`	pixel	1I	Maximum x-coordinate among detected pixels
`YMAX_IMAGE`	pixel	1I	Maximum x-coordinate among detected pixels
`X_WORLD`	deg	1D	Barycentre position along world x axis
`Y_WORLD`	deg	1D	Barycentre position along world y axis
`X2_WORLD`	deg²	1E	Variance of position along `X_WORLD (alpha)`
`Y2_WORLD`	deg²	1E	Variance of position along `Y_WORLD (delta)`
`XY_WORLD`	deg²	1E	Covariance of position `X_WORLD,Y_WORLD`
`ERRX2_WORLD`	deg²	1E	Error on `X2_WORLD`
`ERRY2_WORLD`	deg²	1E	Error on `Y2_WORLD`
`ERRXY_WORLD`	deg²	1E	Error on `XY_WORLD`
`CXX_WORLD`	deg⁻²	1E	SExtractor Cxx object ellipse parameter
`CYY_WORLD`	deg⁻²	1E	SExtractor Cyy object ellipse parameter
`CXY_WORLD`	deg⁻²	1E	SExtractor Cxy object ellipse parameter
`ERRCXX_WORLD`	deg⁻²	1E	Error on `CXX_WORLD`
`ERRCYY_WORLD`	deg⁻²	1E	Error on `CYY_WORLD`
`ERRCXY_WORLD`	deg⁻²	1E	Error on `CXY_WORLD`
`A_IMAGE`	pixel	1D	Profile RMS along x-axis
`B_IMAGE`	pixel	1D	Profile RMS along y-axis
`ERRA_IMAGE`	pixel	1E	Error on `A_IMAGE`
`ERRB_IMAGE`	pixel	1E	Error on `B_IMAGE`
`S_ELLIPTICITY`		1E	SExtractor Ellipticity `(1-B_IMAGE/A_IMAGE)`
`S_ELONGATION`		1E	SExtractor Elongation `(A_IMAGE/B_IMAGE)`
`MAG_APER_4`	mag	1E	r-band Magnitude within a circular aperture of 4 pixels
`MAGERR_APER_4`	mag	1E	Error on `MAG_APER_4`
`FLUX_APER_4`	count	1E	r-band Flux within a circular aperture of 4 pixels
`FLUXERR_APER_4`	count	1E	Error on `FLUX_APER_4`
...
Similarly for radii 6, 8, 10, 14, 20, 30, 40, 60 pixels, up to
...
`MAG_APER_100`	mag	1E	r-band Magnitude within a circular aperture of 100 pixels
`MAGERR_APER_100`	mag	1E	Error on `MAG_APER_100`
`FLUX_APER_100`	count	1E	r-band Flux within a circular aperture of 100 pixels
`FLUXERR_APER_100`	count	1E	Error on `FLUX_APER_100`
`ISO0`	pixel²	1I	Isophotal area at level 0
`ISO1`	pixel²	1I	Isophotal area at level 1
`ISO2`	pixel²	1I	Isophotal area at level 2
`ISO3`	pixel²	1I	Isophotal area at level 3
`ISO4`	pixel²	1I	Isophotal area at level 4
`ISO5`	pixel²	1I	Isophotal area at level 5
`ISO6`	pixel²	1I	Isophotal area at level 6
`ISO7`	pixel²	1I	Isophotal area at level 7
`ALPHA_J2000`	deg	1D	SExtractor named Centroid sky position right ascension (J2000)
`DELTA_J2000`	deg	1D	SEXtractor named Centroid sky position declination (J2000)
`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
List-driven GAAP photometry on the ASTRO-WISE co-added KiDS images and the pawprint VIKING images:
`Agaper_0p7`	arcsec	1E	Major axis of GAAP aperture `MIN_APER 0.7″`
`Bgaper_0p7`	arcsec	1E	Minor axis of GAAP aperture `MIN_APER 0.7″`
`Agaper_1p0`	arcsec	1E	Major axis of GAAP aperture `MIN_APER 1.0″`
`Bgaper_1p0`	arcsec	1E	Minor axis of GAAP aperture `MIN_APER 1.0″`
`PAgaap`	deg	1E	Position angle of major axis of GAAP aperture (North of West)
and then for each band `x` = `u,g,r,i,Z,Y,J,H,Ks`: ^(a)
`FLUX_GAAP_0p7_x`	count	1E	GAAP flux in band `x with MIN_APER = 0.7″`
`FLUXERR_GAAP_0p7_x`	count	1E	Error on `FLUX_GAAP_0p7_x`
`MAG_GAAP_0p7_x`	mag	1E	`x -band` GAAP `magnitude with MIN_APER = 0.7″`
`MAGERR_GAAP_0p7_x`	mag	1E	Error on `MAG_GAAP_0p7_x`
`FLAG_GAAP_0p7_x`		1J	GAAP Flag for `x-band photometry with MIN_APER = 0.7″`
`FLUX_GAAP_1p0_x`	count	1E	GAAP flux in band `x with MIN_APER = 1.0″`
`FLUXERR_GAAP_1p0_x`	count	1E	Error on `FLUX_GAAP_1p0_x`
`MAG_GAAP_1p0_x`	mag	1E	`x-band` GAAP `magnitude with MIN_APER = 1.0″`
`MAGERR_GAAP_1p0_x`	mag	1E	Error on `MAG_GAAP_1p0_x`
`FLAG_GAAP_1p0_x`		1J	GAAP Flag for `x-band photometry with MIN_APER = 1.0″`
Optimal-aperture GAAP 9-band photometry including interstellar extinction corrections
`Agaper`	arcsec	1E	Major axis of GAAP aperture for optimal `MIN_APER`
`Bgaper`	arcsec	1E	Minor axis of GAAP aperture for optimal `MIN_APER`
and then for each band `x`= `u,g,r,i,Z,Y,J,H,Ks`:^(a)
`EXTINCTION_x`	mag	1E	Galactic extinction in band `x`
`MAG_GAAP_x`	mag	1E	`x-band` GAAP `magnitude with optimal MIN_APER (extinction corrected)`
`MAGERR_GAAP_x`	mag	1E	Error on `MAG_GAAP_x`
`FLUX_GAAP_x`	count	1E	`x-band` GAAP `flux with optimal MIN_APER`
`FLUXERR_GAAP_x`	count	1E	Error on `FLUX_GAAP_x`
`FLAG_GAAP_x`		1I	GAAP Flag for `x band photometry with optimal MIN_APER`
`MAG_LIM_x`	mag	1E	`x-band limiting magnitude for optimal MIN_APER`
9-band photometric redshifts (BPZ):
`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 ^(b)`
`CHI_SQUARED_BPZ`		1D	chi sqared value associated with `Z_B`
`M_0`	mag	1D	Reference magnitude for BPZ prior
`BPZ_FILT`		1J	Filters with good photometry (BPZ)
`NBPZ_FILT`		1J	Number of filters with good photometry (BPZ)
`BPZ_NONDETFILT`		1J	Filters with faint photometry (BPZ)
`NBPZ_NONDETFILT`		1J	Number of filters with faint photometry (BPZ)
`BPZ_FLAGFILT`		1J	Flagged filters (BPZ)
`NBPZ_FLAGFILT`		1J	Number of flagged filters (BPZ)
`SG_FLAG`		1E	Star/Gal Classifier
`MASK`		1J	9-band mask information ^(c)
Dereddened colours based on optimal-aperture GAAP photometry
`COLOUR_GAAP_u_g`	mag	1E	u − g colour index (dereddened)
`COLOUR_GAAP_g_r`	mag	1E	g − r colour index (dereddened)
`COLOUR_GAAP_r_i`	mag	1E	r − i colour index (dereddened)
`COLOUR_GAAP_i_Z`	mag	1E	i − Z colour index (dereddened)
`COLOUR_GAAP_Z_Y`	mag	1E	Z − Y colour index (dereddened)
`COLOUR_GAAP_Y_J`	mag	1E	Y − J colour index (dereddened)
`COLOUR_GAAP_J_H`	mag	1E	J − H colour index (dereddened)
`COLOUR_GAAP_H_Ks`	mag	1E	H − K_s colour index (dereddened)

Notes.

^(a)

See Sect. 5 for the definitions of the flux and magnitude zeropoints.

^(b)

Definition of the spectral types: 1 = CWW-Ell, 2 = CWW-Sbc, 3 = CWW-Scd, 4 = CWW-Im, 5 = KIN-SB3, 6 = KIN-SB2.

^(c)

For the meaning of the mask see Table A.5.

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