Cluster catalog

We present a catalog of 1543 candidate galaxy clusters found in the DR2 release of the Kilo-Degree Survey (KiDS), covering an area of 114 sq. degrees, in the redshift range 0 ≤ z ≤ 0.7. Based on simulated data, we derived a completeness of ~ 85% and a purity of at least 80%.
The catalog also includes the positions and magnitudes of the galaxies identified as the BCG in each cluster, as well as an estimate of the cluster masses, computed using the number of candidate cluster member galaxies as a proxy. Due to the limited area available in KiDS DR2, the calibration of the richness-mass relation is still preliminary, and will be improved in the next releases.

Catalog download

The link to the catalog, in ASCII format, is provided below. The catalog is also available on CDS.

Catalog description

The table below provides brief descriptions for the catalog columns. We refer to Radovich et al. (2017, A&A, 598, A107) for details on how the catalog was obtained and a more detailed description of its content and characteristics.

ID Cluster name (KDR2_JHHMMSS.s+DDMMSS)
RA Cluster Right Ascension in decimal degrees (J2000)
DEC Cluster Declination in decimal degrees (J2000)
z Photometric redshift of cluster
snr Signal to noise of cluster detection
RA_bcg BCG Right Ascension in decimal degrees (J2000)
DEC_bcg BCG Declination in decimal degrees (J2000)
rmag BCG r band magnitude
N500 Number of member galaxy candidates within R500
R500 Radius at Delta=500 (Mpc)
M500 Cluster mass within R500 (1014 Msun)
errM500 Uncertainty on M500
N200 Number of member galaxy candidates within R500
R200 Radius at Delta=200 (Mpc)
M200 Cluster mass within R200 (1014 Msun)
errM200 Uncertainty on M200