Stellar mass as a galaxy cluster mass proxy: application to the Dark Energy Survey redMaPPer clusters. Issue 4 (21st February 2020)

• Record Type: Journal Article
• Authors: Palmese, A; Annis, J; Burgad, J; Farahi, A; Soares-Santos, M; Welch, B; da Silva Pereira, M; Lin, H; Bhargava, S; Hollowood, D L; Wilkinson, R; Giles, P; Jeltema, T; Romer, A K; Evrard, A E; Hilton, M; Vergara Cervantes, C; Bermeo, A; Mayers, J; DeRose, J; Gruen, D; Hartley, W G; Lahav, O; Leistedt, B; McClintock, T; Rozo, E; Rykoff, E S; Varga, T N; Wechsler, R H; Zhang, Y; Avila, S; Brooks, D; Buckley-Geer, E; Burke, D L; Carnero Rosell, A; Carrasco Kind, M; Carretero, J; Castander, F J; Collins, C; da Costa, L N; Desai, S; De Vicente, J; Diehl, H T; Dietrich, J P; Doel, P; Flaugher, B; Fosalba, P; Frieman, J; García-Bellido, J; Gerdes, D W; Gruendl, R A; Gschwend, J; Gutierrez, G; Honscheid, K; James, D J; Krause, E; Kuehn, K; Kuropatkin, N; Liddle, A; Lima, M; Maia, M A G; Mann, R G; Marshall, J L; Menanteau, F; Miquel, R; Ogando, R L C; Plazas, A A; Roodman, A; Rooney, P; Sahlen, M; Sanchez, E; Scarpine, V; Schubnell, M; Serrano, S; Sevilla-Noarbe, I; Sobreira, F; Stott, J; Suchyta, E; Swanson, M E C; Tarle, G; Thomas, D; Tucker, D L; Viana, P T P; Vikram, V; Walker, A R;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 493:Issue 4(2020)
• Page Start: 4591
• Page End: 4606
• Publication Date: 2020-02-21
• Subjects: surveys -- galaxies: clusters: general -- galaxies: evolution -- galaxies: haloes -- cosmology: observations; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa526
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: We introduce a galaxy cluster mass observable, μ⋆, based on the stellar masses of cluster members, and we present results for the Dark Energy Survey (DES) Year 1 (Y1) observations. Stellar masses are computed using a Bayesian model averaging method, and are validated for DES data using simulations and COSMOS data. We show that μ⋆ works as a promising mass proxy by comparing our predictions to X-ray measurements. We measure the X-ray temperature–μ⋆ relation for a total of 129 clusters matched between the wide-field DES Y1 redMaPPer catalogue and Chandra and XMM archival observations, spanning the redshift range 0.1 < $z$ < 0.7. For a scaling relation that is linear in logarithmic space, we find a slope of α = 0.488 ± 0.043 and a scatter in the X-ray temperature at fixed μ⋆ of $\sigma _{{\rm ln} T_\mathrm{ X}|\mu _\star }= 0.266^{+0.019}_{-0.020}$ for the joint sample. By using the halo mass scaling relations of the X-ray temperature from the Weighing the Giants program, we further derive the μ⋆ -conditioned scatter in mass, finding $\sigma _{{\rm ln} M|\mu _\star }= 0.26^{+ 0.15}_{- 0.10}$ . These results are competitive with well-established cluster mass proxies used for cosmological analyses, showing that μ⋆ can be used as a reliable and physically motivated mass proxy to derive cosmological constraints.