For all 98 tiles completed (i.e. the final observations were obtained) between 1 October 2012 and 1 October 2013 the following data products:
- Coadds: photometrically and astrometrically calibrated, stacked images (1 per filter per tile)
- Weights: weight frames (1 for each Coadd)
- Flag images: FITS images with pixel flags in areas affected by bright stars, saturated pixels, reflections, and other artefacts (1 for each Coadd)
- Source lists: lists of sources detected in single Coadds
For all 148 tiles released in KiDS-ESO-DR1 and KiDS-ESO-DR2:
- a multi-band, aperture-matched source catalog
PSF size and ellipticity distributions and achieved limiting magnitudes can be summarized as follows:
(2'' 5σ AB)
The photometric calibration is in AB magnitudes in the instrumental photometric calibration. Tiles are photometrically homogenized by tying stellar photometry between the dithers and overlapping CCDs together; the resulting photometry is flat to typically within 2% over the full square degree FOV. Absolute photometry is done per tile and based on nightly zeropoints based on SA field observations.
Global solutions are calculated for each tile, spanning all dithers and CCDs, with 2MASS used as reference catalog. The 2-dimensional RMS of source positions between the dithers is typically 0.03 arcseconds.
Bright star and defects masking:
Flag images are provided with pixel flags indicating regions affected by saturated pixels, diffraction spikes, reflection halos, and other (manually masked) defects.
Single-band source lists are extracted from the Coadds. The source lists provide for
each detected source several magnitude measurements, a large number of aperture fluxes,
star/galaxy classification, and masking flags.
The typical 98% completeness magnitudes for the 4 filters are 22.8 in u, 24.0 in g, 23.9 in r, and 22.5 in i.
The multi-band catalog is based on source detection in the r-band. For all sources a number of aperture fluxes, S/G separation, and masking flags are provided. Furthermore, Gaussian Aperture Photometry and aperture-corrected fluxes are provided to account for seeing differences between filters. The typical 98% completeness measured in the r-band is 23.9 mag.
Data products can be accessed via: