Pereira, M E S, Palmese, A, Varga, T N, McClintock, T, Soares-Santos, M, Burgad, J, Annis, J, Farahi, A, Lin, H, Choi, A, DeRose, J, Esteves, J, Gatti, M, Bhargava, S, Romer, A K, DES Collaboration, and others, (2020) μ* masses: weak-lensing calibration of the dark energy survey year 1 redMaPPer clusters using stellar masses. Monthly Notices of the Royal Astronomical Society, 498 (4). pp. 5450-5467. ISSN 0035-8711

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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 ∼5.5 × 1013 M, 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-μz scaling relation given by M200c|μ, z = M0(μ5.16 × 1012 M)Fμ ((1 + z)/1.35)Gz. We find M0 = (1.14 ± 0.07) × 1014 M with Fμ= 0.76 ± 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.

Item Type:	Article
Schools and Departments:	School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor:	Mx Elements Account
Depositing User:	Mx Elements Account
Date Deposited:	19 Jan 2021 09:56
Last Modified:	19 Jan 2021 10:00
URI:	http://sro.sussex.ac.uk/id/eprint/96565

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