Kavli Affiliate: Eli S. Rykoff
| First 5 Authors: Constantin Payerne, Zhuowen Zhang, Michel Aguena, Céline Combet, Thibault Guillemin
| Summary:
Cluster scaling relations are key ingredients in cluster abundance-based
cosmological studies. In optical cluster cosmology, where clusters are detected
through their richness, cluster-weak gravitational lensing has proven to be a
powerful tool to constrain the cluster mass-richness relation. This work is
conducted as part of the Dark Energy Science Collaboration (DESC), which aims
to analyze the Legacy Survey of Space and Time (LSST) of the Vera C. Rubin
Observatory, starting in 2026. Weak lensing-inferred cluster properties, such
as mass, suffer from several sources of bias. We constrain the mass-richness
relation of 3,600 clusters detected by the redMaPPer algorithm in the cosmoDC2
extra-galactic mock catalog of the LSST DESC DC2 simulation, covering 440
square degrees, using number count measurements and either stacked weak lensing
profiles or mean cluster masses in intervals of richness ($20 < lambda < 200$)
and redshift ($0.2 < z < 1$). We find that, for an LSST-like source galaxy
density, our constraints are robust to changes in the concentration-mass
relation and dark matter density profile modeling choices, when source
redshifts and shapes are perfectly known. We find that photometric redshift
uncertainties can introduce bias at the 1$sigma$ level, which can be mitigated
by an overall correction factor, fitted jointly with the scaling parameters. We
find that including positive shear-richness covariance in the fit shifts the
results by up to 0.5$sigma$. Our constraints also compare fairly to a fiducial
mass-richness relation, obtained from matching cosmoDC2 halo masses to
redMaPPer-detected cluster richnesses.
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