μ⋆ masses: weak-lensing calibration of the Dark Energy Survey Year 1 redMaPPer clusters using stellar masses Academic Article uri icon

abstract

  • 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 ${sim} 5.5 imes 10^{13} , mathrm{M}_{odot }$, 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 $langle M_{200c} | mu _{star },z
    angle = M_0 (mu _{star }/5.16 imes 10^{12} , mathrm{M_{odot }})^{F_{mu _{star }}} ((1+z)/1.35)^{G_z}$. We find $M_0= (1.14 pm 0.07) imes 10^{14} , mathrm{M_{odot }}$ 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.

altmetric score

  • 13.38

author list (cited authors)

  • Pereira, M., Palmese, A., Varga, T. N., McClintock, T., Soares-Santos, M., Burgad, J., ... Zhang, Y.

citation count

  • 2

publication date

  • September 2020