학술논문

μ masses: weak-lensing calibration of the Dark Energy Survey Year 1 redMaPPer clusters using stellar masses.
Document Type
Article
Source
Monthly Notices of the Royal Astronomical Society. 11/15/2020, Vol. 498 Issue 4, p5450-5467. 18p.
Subject
*STELLAR mass
*DARK energy
*CALIBRATION
*GALAXY clusters
*GRAVITATIONAL lenses
Language
ISSN
0035-8711
Abstract
We present the weak-lensing mass calibration of the stellar-mass-based μ⋆ mass proxy for redMaPPer galaxy clusters in the Dark Energy Survey Year 1. For the first time, we are able to perform a calibration of μ⋆ at high redshifts, z > 0.33. In a blinded analysis, we use ∼6000 clusters split into 12 subsets spanning the ranges 0.1 ≤ z < 0.65 and μ⋆ up to |${\sim} 5.5 \times 10^{13} \, \mathrm{M}_{\odot }$|⁠ , and infer the average masses of these subsets through modelling of their stacked weak-lensing signal. In our model, we account for the following sources of systematic uncertainty: shear measurement and photometric redshift errors, miscentring, cluster-member contamination of the source sample, deviations from the Navarro–Frenk–White halo profile, halo triaxiality, and projection effects. We use the inferred masses to estimate the joint mass–μ⋆– z scaling relation given by |$\langle M_{200c} | \mu _{\star },z \rangle = M_0 (\mu _{\star }/5.16\times 10^{12} \, \mathrm{M_{\odot }})^{F_{\mu _{\star }}} ((1+z)/1.35)^{G_z}$|⁠. We find |$M_0= (1.14 \pm 0.07) \times 10^{14} \, \mathrm{M_{\odot }}$| with |$F_{\mu _{\star }}= 0.76 \pm 0.06$| and Gz = −1.14 ± 0.37. We discuss the use of μ⋆ as a complementary mass proxy to the well-studied richness λ for: (i) exploring the regimes of low z , λ < 20 and high λ, z ∼ 1; and (ii) testing systematics such as projection effects for applications in cluster cosmology. [ABSTRACT FROM AUTHOR]