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

M.E.S. Pereira , A. Palmese , T.N. Varga , T. Mcclintock , M. Soares-Santos , J. Burgad , J. Annis , A. Farahi , H. Lin , A. Choi , J. Derose , J. Esteves , M. Gatti , D. Gruen , W.G. Hartley , B. Hoyle , T. Jeltema , N. Maccrann , A. Roodman , C. Sánchez , T. Shin , A. von Der Linden , J. Zuntz , T.M.C. Abbott , M. Aguena , S. Avila , E. Bertin (1) , S. Bhargava , S.L. Bridle , D. Brooks , D.L. Burke , A. Carnero Rosell , M. Carrasco Kind , J. Carretero , M. Costanzi , L.N. da Costa , S. Desai , H.T. Diehl , J.P. Dietrich , P. Doel , J. Estrada , S. Everett , B. Flaugher , P. Fosalba , J. Frieman , J. García-Bellido , E. Gaztanaga , D.W. Gerdes , R.A. Gruendl , J. Gschwend , G. Gutierrez , S.R. Hinton , D.L. Hollowood , K. Honscheid , D.J. James , K. Kuehn , N. Kuropatkin , O. Lahav , M. Lima , M.A.G. Maia , M. March , J.L. Marshall , P. Melchior , F. Menanteau , R. Miquel , R.L.C. Ogando , F. Paz-Chinchón , A.A. Plazas , A.K. Romer , E. Sanchez , V. Scarpine , M. Schubnell , S. Serrano , I. Sevilla-Noarbe , M. Smith , E. Suchyta , M.E.C. Swanson , G. Tarle , R.H. Wechsler , J. Weller , Y. Zhang

1 IAP - Institut d'Astrophysique de Paris

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 = −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.

Mots clés: gravitational lensing: weak; galaxies: clusters: general; cosmology: observations

Domaines: Astrophysique [astro-ph]

M.E.S. Pereira, A. Palmese, T.N. Varga, T. Mcclintock, M. Soares-Santos, et al.. μ⋆ masses: weak-lensing calibration of the Dark Energy Survey Year 1 redMaPPer clusters using stellar masses. Monthly Notices of the Royal Astronomical Society, 2020, 498 (4), pp.5450-5467. ⟨10.1093/mnras/staa2687⟩. ⟨hal-02892941⟩