KiDS-1000 catalogue: Redshift distributions and their calibration.

We present redshift distribution estimates of galaxies selected from the fourth data release of the Kilo-Degree Survey over an area of $\sim1000$ deg$^2$ (KiDS-1000). These redshift distributions represent one of the crucial ingredients for weak gravitational lensing measurements with the KiDS-1000 data. The primary estimate is based on deep spectroscopic reference catalogues that are re-weighted with the help of a self-organising-map (SOM) to closely resemble the KiDS-1000 sources, split into five tomographic redshift bins in the photometric redshift range $0.1

Keywords:

• Astronomy
• Residual
• Astrophysics
• Cluster analysis
• Galaxy
• Photometric redshift
• Physics
• Calibration
• Redshift
• Systematic error
• Weak gravitational lensing

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