THE REDMAPPER GALAXY CLUSTER CATALOG FROM DES SCIENCE VERIFICATION DATA

By Eli S. Rykoff, E. Rozo, D. Hollowood, A. Bermeo-Hernandez, Tesla E. Jeltema, J. Mayers, A. Romer, P. Rooney, A. Saro, C. Cervantes and 79 more. Astrophysical Journal Supplement Series, 2016

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We describe updates to the redMaPPer algorithm, a photometric red-sequence cluster finder specifically designed for large photometric surveys. The updated algorithm is applied to of Science Verification (SV) data from the Dark Energy Survey (DES), and to the Sloan Digital Sky Survey (SDSS) DR8 photometric data set. The DES SV catalog is locally volume limited and contains 786 clusters with richness (roughly equivalent to ) and . The DR8 catalog consists of 26,311 clusters with , with a sharply increasing richness threshold as a function of redshift for . The photometric redshift performance of both catalogs is shown to be excellent, with photometric redshift uncertainties controlled at the level for , rising to ∼0.02 at in DES SV. We make use of Chandra and XMM X-ray and South Pole Telescope Sunyaev–Zeldovich data to show that the centering performance and mass–richness scatter are consistent with expectations based on prior runs of redMaPPer on SDSS data. We also show how the redMaPPer photo-z and richness estimates are relatively insensitive to imperfect star/galaxy separation and small-scale star masks.

Subfields: Astronomy and Astrophysics, Instrumentation

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Citations in the corpus

The DES Science Verification weak lensing shear catalogues (2015, methodology): “…the SVA1 release includes files for the Gold Catalogue, limiting magnitude maps, the good-region footprint, photo-z catalogues (including both point estimates and full PDFs) (Bonnett et al. 2015), redMaPPer cluster catalogues (Rykoff et al. 2016), and redMaGiC galaxy catalogues (Rozo et al. 2015).”
Dark Energy Survey Year 1 results: weak lensing mass calibration of redMaPPer galaxy clusters (2018, methodology): “4.17 (Rykoff et al. 2014, 2016).”
Weak Lensing Measurement of the Mass--Richness Relation of SDSS redMaPPer Clusters (2016, methodology): “Cluster random points were generated using the updated method of Rykoff et al. (2016).”
The Atacama Cosmology Telescope: A Catalog of >4000 Sunyaev–Zel’dovich Galaxy Clusters (2020, methodology): “Both catalogs contain only λ> 20 systems; at this richness, only 5%– 7% of the clusters are expected to be projections along the line of sight (Rykoff et al. 2014, 2016).”