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µ* masses: weak-lensing calibration of the dark energy survey year 1 redMaPPer clusters using stellar masses

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posted on 2023-06-09, 22:48 authored by 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, Sunayana Bhargava, Kathy RomerKathy Romer, DES Collaboration, others
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 ? for: (i) exploring the regimes of low z, ? < 20 and high ?, z ~ 1; and (ii) testing systematics such as projection effects for applications in cluster cosmology.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

4

Volume

498

Page range

5450-5467

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2021-01-19

First Open Access (FOA) Date

2021-01-19

First Compliant Deposit (FCD) Date

2021-01-18

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