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II/347          KiDS-ESO-DR3 multi-band source catalog          (de Jong+, 2017)

The third data release of the Kilo-Degree Survey and associated data products. de Jong J.T.A., Verdoes Kleijn G.A., Erben, T., Hildebrandt H., Kuijken K., Sikkema G., Brescia M., Bilicki, M., Napolitano, N.R., Amaro, V., Begeman K.G., Boxhoorn D.R., Buddelmeijer H., Cavuoti S., Getman F., Grado A., Helmich E., Huang Z., Irisarri N., La Barbera F., Longo, G., McFarland J.P., Nakajima R., Paolillo M., Puddu E., Radovich M., Rifatto, A., Tortora, C, Valentijn E.A., Vellucci, C., Vriend, W-J., Amon, A., Blake, C., Choi, A., Fenech Conti, I., Herbonnet, R., Heymans, C., Hoekstra, H., Klaes, D., Merten, J., Miller, L., Schneider, P., Viola, M. <eprint arXiv:1703.02991> = 2017arXiv170302991D = 2017yCat.2347....0D
ADC_Keywords: Photometry, ugriz ; Galaxy catalogs ; Extinction ; Redshifts Mission_Name: ESO Keywords: Astrophysics - Astrophysics of Galaxies; Astrophysics - Cosmology and Nongalactic Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics Abstract: The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at the VLT Survey Telescope. It aims to image 1500 square degrees in four filters (ugri). The core science driver is mapping the large-scale matter distribution in the Universe, using weak lensing shear and photometric redshift measurements. Further science cases include galaxy evolution, Milky Way structure, detection of high-redshift clusters, and finding rare sources such as strong lenses and quasars. Here we present the third public data release (DR3) and several associated data products, adding further area, homogenized photometric calibration, photometric redshifts and weak lensing shear measurements to the first two releases. A dedicated pipeline embedded in the Astro-WISE information system is used for the production of the main release. Modifications with respect to earlier releases are described in detail. Photometric redshifts have been derived using both Bayesian template fitting, and machine-learning techniques. For the weak lensing measurements, optimized procedures based on the THELI data reduction and lensfit shear measurement packages are used. The multi-band catalogue, including homogenized photometry and photometric redshifts, covers the combined DR1, DR2 and DR3 footprint of 440 survey tiles (447deg2). Limiting magnitudes are typically 24.3, 25.1, 24.9, 23.8 (5 sigma in a 2 arcsec aperture) in ugri, respectively, and the typical r-band PSF size is less than 0.7 arcsec. The photometric homogenization scheme ensures accurate colors and an absolute calibration stable to ∼2% for gri and ∼3% in u. Separately released are a weak lensing shear catalogue and photometric redshifts based on two different machine-learning techniques. Description: KiDS-ESO-DR3 contains a multi-band source catalogue encompassing all publicly released tiles, a total of 440 survey tiles including the coadded images, weight maps, masks and source lists of 292 survey tiles of KiDS-ESO-DR3, adding to the 148 tiles released previously (50 in KiDS-ESO-DR1 and 98 in KiDS-ESO-DR2). KiDS DR3 Acknowledgements: Users of data from this release should cite "de Jong et al. (2013, ExA 35, 25)" and are required to acknowledge the source of the data with the following citation in their publications: Based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under programme IDs 177.A-3016, 177.A-3017 and 177.A-3018, and on data products produced by Target/OmegaCEN, INAF-OACN, INAF-OAPD and the KiDS production team, on behalf of the KiDS consortium. OmegaCEN and the KiDS production team acknowledge support by NOVA and NWO-M grants. Members of INAF-OAPD and INAF-OACN also acknowledge the support from the Department of Physics & Astronomy of the University of Padova, and of the Department of Physics of Univ. Federico II (Naples). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file kids_dr3.sam 786 1000 *KiDS-ESO-DR3 multi-band source catalog
Note on kids_dr3.sam: This is a sample of the complete multi-band catalog containing 48,736,590 sources.
See also: II/344 : KiDS-ESO-DR2 multi-band source catalog (de Jong+, 2015) : KiDS Data Release 3 home page : ESO Public Surveys releases : Astro-WISE (Astronomical Wide-field Imaging System for Europe) home page Byte-by-byte Description of file: kids_dr3.sam
Bytes Format Units Label Explanations
1- 25 A25 --- KiDS Source identifier (KIDS (ID) 27- 36 F10.6 deg RAdeg Right ascension (J2000) (RAJ2000) 38- 47 F10.6 deg DEdeg Declination (J2000) (DECJ2000) 49- 55 I7 --- CollID Astro-WISE SourceCollection identifier (SCID) 57- 64 I8 --- ListID Astro-WISE SourceList identifier (SLID) 66- 71 I6 --- SrcID [0/586899] Astro-WISE Source identifier (SID) 73 I1 --- mClass [0/6] Star/galaxy separation (SG2DPHOT) (1) 75- 83 F9.4 pix A [0.4/1227] Linear semi major axis 85- 92 F8.4 pix B [0.03/360] Linear semi minor axis 94- 98 F5.3 --- S/G SExtractor star/galaxy classifier (0=galaxy) (CLASS_STAR) 100-104 F5.3 --- Ell Ellipticity (ELLIPTICITY) 106-112 F7.4 pix Rad [3/33] Kron-radius used for MAG_AUTO (KRON_RADIUS) 114-120 F7.3 deg PA [-90/90] Position angle (POSANG) 122-134 F13.4 pix urad ? u-band SExtractor FLUX_RADIUS (FLUXRADIUSU) 136-147 F12.4 pix grad ? g-band SExtractor FLUX_RADIUS (FLUXRADIUSG) 149-163 F15.4 pix rrad ? r-band SExtractor FLUX_RADIUS (FLUXRADIUSR) 165-177 F13.4 pix irad ? i-band SExtractor FLUX_RADIUS (FLUXRADIUSI) 179-192 F14.4 pix uFWHM ? u-band SExtractor FWHM_IMAGE (FWHMIMAGEU) 194-207 F14.4 pix gFWHM ? g-band SExtractor FWHM_IMAGE (FWHMIMAGEG) 209-219 F11.4 pix rFWHM ? r-band SExtractor FWHM_IMAGE (FWHMIMAGER) 221-232 F12.4 pix iFWHM ? i-band SExtractor FWHM_IMAGE (FWHMIMAGEI) 234-236 I3 --- uflg [0/120] u-band SExtractor extraction flag (0=most reliable) (FLAG_U) (2) 238-240 I3 --- gflg g-band SExtractor extraction flag (FLAG_G) (2) 242-244 I3 --- rflg r-band SExtractor extraction flag (FLAG_R) (2) 246-248 I3 --- iflg i-band SExtractor extraction flag (FLAG_I) (2) 250-252 I3 --- uflgISO u-band mask flag (IMAFLAGSISOU) (3) 254-256 I3 --- gflgISO g-band mask flag (IMAFLAGSISOG) (3) 258-260 I3 --- rflgISO r-band mask flag (IMAFLAGSISOR) (3) 262-264 I3 --- iflgISO [0/255] i-band mask flag (IMAFLAGSISOI) (3) 266-273 F8.5 mag e_umag [0/100]? u-band error in MAG_AUTO (MAGERRAUTOU) (4) 275-282 F8.5 mag e_gmag [0/100]? g-band error in MAG_AUTO (MAGERRAUTOG) (4) 284-291 F8.5 mag e_rmag [0/100]? r-band error in MAG_AUTO (MAGERRAUTOR) (4) 293-300 F8.5 mag e_imag [0/100]? i-band error in MAG_AUTO (MAGERRAUTOI) (4) 302-309 F8.5 mag e_umagISO [0/100]? u-band error in MAG_ISO (MAGERRISOU) (4) 311-318 F8.5 mag e_gmagISO [0/100]? g-band error in MAG_ISO (MAGERRISOG) (4) 320-326 F7.5 mag e_rmagISO [0/6]? r-band error in MAG_ISO (MAGERRISOR) (4) 328-335 F8.5 mag e_imagISO [0/100]? i-band error in MAG_ISO (MAGERRISOI) (4) 337-344 F8.5 mag umag [8/41]? u-band MAG_AUTO (MAGAUTOU) 346-353 F8.5 mag gmag [8/44]? g-band MAG_AUTO (MAGAUTOG) 355-362 F8.5 mag rmag [9/42]? r-band MAG_AUTO (MAGAUTOR) 364-371 F8.5 mag imag [8/42]? i-band MAG_AUTO (MAGAUTOI) 373-380 F8.5 mag umagISO [10/47]? u-band MAG_ISO (MAGISOU) 382-389 F8.5 mag gmagISO [9/45]? g-band MAG_ISO (MAGISOG) 391-398 F8.5 mag rmagISO [9/30]? r-band MAG_ISO (MAGISOR) 400-407 F8.5 mag imagISO [10/46]? i-band MAG_ISO (MAGISOI) 409-415 I7 --- uNmp u-band number of masked pixels (NIMAFLAGSISOU) 417-423 I7 --- gNmp g-band number of masked pixels (NIMAFLAGSISOG) 425-431 I7 --- rNmp r-band number of masked pixels (NIMAFLAGSISOR) 433-439 I7 --- iNmp i-band number of masked pixels (NIMAFLAGSISOI) 441-446 I6 pix2 uisoA u-band isophotal aperture (ISOAREAIMAGEU) 448-454 I7 pix2 gisoA g-band isophotal aperture (ISOAREAIMAGEG) 456-462 I7 pix2 risoA r-band isophotal aperture (ISOAREAIMAGER) 464-470 I7 pix2 iisoA i-band isophotal aperture (ISOAREAIMAGEI) 472-481 F10.4 pix uXpos X pixel position in u-band image (XPOS_U) 483-492 F10.4 pix gXpos X pixel position in g-band image (XPOS_G) 494-503 F10.4 pix rXpos X pixel position in r-band image (XPOS_R) 505-514 F10.4 pix iXpos X pixel position in i-band image (XPOS_I) 516-525 F10.4 pix uYpos Y pixel position in u-band image (YPOS_U) 527-536 F10.4 pix gYpos Y pixel position in g-band image (YPOS_G) 538-547 F10.4 pix rYpos Y pixel position in r-band image (YPOS_R) 549-558 F10.4 pix iYPpos Y pixel position in i-band image (YPOS_I) 560-563 F4.2 arcsec amaj [0.7/2] Linear semi major axis of GAaP aperture (A_GAAP) 565-568 F4.2 arcsec bmin [0.7/2]? Linear semi minor axis of GAaP aperture (B_GAAP) 570-574 F5.1 deg PAGAAP [-90/90] Position angle of GAaP aperture (POSANG_GAAP) 576-583 F8.5 mag umagGAAP [12/44]? GAaP u-band magnitude (MAGGAAPU) (5) 585-592 F8.5 mag gmagGAAP [12/46]? GAaP g-band magnitude (MAGGAAPG) (5) 594-601 F8.5 mag rmagGAAP [13/42]? GAaP r-band magnitude (MAGGAAPR) (5) 603-610 F8.5 mag imagGAAP [12/48]? GAaP i-band magnitude (MAGGAAPI) (5) 612-619 F8.5 mag e_umagGAAP [0/100]? error in GAaP u-band magnitude (MAGERRGAAPU) (4) 621-628 F8.5 mag e_gmagGAAP [0/100]? error in GAaP g-band magnitude (MAGERRGAAPG) (4) 630-637 F8.5 mag e_rmagGAAP [0/100]? error in GAaP r-band magnitude (MAGERRGAAPR) (4) 639-646 F8.5 mag e_imagGAAP [0/100]? error in GAaP i-band magnitude (MAGERRGAAPI) (4) 648-654 F7.4 mag dumag [-0.7/0.3] u-band photometric homogenization ZPT offset (ZPTOFFSETU) (6) 656-662 F7.4 mag dgmag [-0.4/0.7] g-band photometric homogenization ZPT offset (ZPTOFFSETG) (6) 664-670 F7.4 mag drmag [-0.3/0.2] r-band photometric homogenization ZPT offset (ZPTOFFSETR) (6) 672-678 F7.4 mag dimag [-0.4/0.5] i-band photometric homogenization ZPT offset (ZPTOFFSETI) (6) 680-685 F6.4 mag Au [0.03/1] u-band Galactic foreground extinction following Schlegel et al. maps (EXTSFDU) 687-692 F6.4 mag Ag [0.02/0.7] g-band Galactic foreground extinction following Schlegel et al. maps (EXTSFDG) 694-699 F6.4 mag Ar [0.02/0.6] r-band Galactic foreground extinction following Schlegel et al. maps (EXTSFDR) 701-706 F6.4 mag Ai [0.01/0.4] i-band Galactic foreground extinction following Schlegel et al. maps (EXTSFDI) 708-711 F4.2 --- zbest [0/3.5] Best-fitting BPZ photometric redshift (ZBBPZ) 713-717 F5.3 --- Odds [0.02/1] Empirical ODDS of ZBBPZ (ODDS_BPZ) (7) 719-723 F5.3 --- TB [1/6] Best-fitting BPZ spectral type (TBBPZ) (8) 725-726 I2 --- Tflg [0/12] Tile quality warning flag (TILE_FLAG) (9) 728-736 F9.5 mag u-g [-22/19.4]? Homogenized and Extinction corrected GAaP u-g band color (COLORGAAPHOMU_G) 738-746 F9.5 mag u-r [-16/21]? Homogenized and Extinction corrected GAaP u-r band color (COLORGAAPHOMU_R) 748-756 F9.5 mag u-i [-25/22]? Homogenized and Extinction corrected GAaP u-i band color (COLORGAAPHOMU_I) 758-766 F9.5 mag g-r [-16/24]? Homogenized and Extinction corrected GAaP g-r band color (COLORGAAPHOMG_R) 768-776 F9.5 mag g-i [-25/24.3]? Homogenized and Extinction corrected GAaP g-i band color (COLORGAAPHOMG_I) 778-786 F9.5 mag r-i [-24.2/16]? Homogenized and Extinction corrected GAaP r-i band color (COLORGAAPHOMR_I)
Note (1): Result of the S/G classification as below: 1 = high-confidence star candidates, 2 = objects with FWHM smaller than stars in the stellar locus, e.g., some cosmic-rays and/or other unreliable sources, 4 = stars according to S/G separation, and 0 = otherwise (galaxies); Flag values are summed, so mClass=5 signifies a high-confidence star candidate that is also above the S/G separation line. Note (2): The extraction flag of a source given as a sum of powers of 2 by SExtractor. If a source has neighbors (flag = 1) and is blended with another source (flag = 2) and some pixels are saturated (flag = 4), then the final extraction flag given to the source is 7 (= 1+4+2). Generally, a source with the extraction flag 0 gives the most reliable photometry. For detailed information on this flag, see the SExtractor User's Manual. Note (3): The flag image is used during source extraction for the single-band source list to flag sources whose isophotes overlap with the critical areas. The resulting flags are stored in the following two SExtractor parameters: IMAFLAGS_ISO: sum of all mask flags encountered in the isophote profile; NIMAFLAG_ISO: number of flagged pixels entering IMAFLAGS_ISO. 1 = Readout spike 2 = Saturation code 4 = Diffraction spike 8 = Primary halo 16 = Secondary halo 32 = Tertiary halo 64 = Bad pixel See section 4.4 in de Jong et al. (2015A&A...582A..62D) for further explanations. Note (4): Magnitudes uncertainties ≥100mag have been left blank by CDS. Note (5): These magnitudes are based on Gaussian Aperture and Photometry (GAaP) measurements and are mainly intended for colour measurements, since they only probe the central regions of the source. They are not total magnitudes, except in the case of unresolved or point sources. Note (6): Zero-point offsets for each filter based on stellar locus regression (gri) and overlap photometry (ugri) that homogenize the photometry over the survey. Please note that these offsets, as well as the extinction corrections EXTSFD<filter> have not been applied in the fluxes and magnitudes provided in the catalog. These corrections should be applied as: MAG*<filter>corrected = MAG*<filter>+ZPTOFFSET<filter>-EXTSFD<filter> Note (7): 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. Note (8): 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 (Capak, 2004, PhD. thesis, Univ. Hawai'i). Flag as follows: 1 = CWW-Ell, 2 = CWW-Sbc, 3 = CWW-Scd, 4 = CWW-Im, 5 = KIN-SB3, 6 = KIN-SB2. Note (9): Bitmap that identifies coadds that are severely affected by image defects such as scattered light features. Masking of these features is currently not available for the imaging data released in KiDS-ESO-DR3, so data tiles flagged with this flag should be used with caution. The flag values indicate which filter is affected: 1 = u ; 2 = g ; 3 = r ; 4 = i .
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(End) Francois-Xavier Pineau, Emmanuelle Perret [CDS] 11-Apr-2017
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