Stellar mass as a galaxy cluster mass proxy: application to the Dark Energy Survey redMaPPer clusters

Palmese, A.; Annis, J.; Burgad, J.; Farahi, A.; Soares-Santos, M.; Welch, B.; Pereira, M. da Silva; Lin, H.; Bhargava, S.; Hollowood, D. L.; Wilkinson, R.; Giles, P.; Jeltema, T.; Romer, A. K.; Evrard, A. E.; Hilton, M.; Cervantes, C. Vergara; 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.; Rosell, A. Carnero; Kind, M. Carrasco; 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.; Garcia-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. und Walker, A. R. (2020): Stellar mass as a galaxy cluster mass proxy: application to the Dark Energy Survey redMaPPer clusters. In: Monthly Notices of the Royal Astronomical Society, Bd. 493, Nr. 4: S. 4591-4606

Abstract

We introduce a galaxy cluster mass observable, mu(*), 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 mu(*) works as a promising mass proxy by comparing our predictions to X-ray measurements. We measure the X-ray temperature-mu(*) 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 alpha = 0.488 +/- 0.043 and a scatter in the X-ray temperature at fixed mu(*) of sigma(lnTX)vertical bar mu(*) = 0.266(-0.020)(+0.019) 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 mu(star)- conditioned scatter inmass, finding sigma(lnM)vertical bar mu(*) = 0.26(-0.10)(+0.15). These results are competitive with well-established cluster mass proxies used for cosmological analyses, showing that mu(*) can be used as a reliable and physically motivated mass proxy to derive cosmological constraints.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0035-8711
• Sprache: Englisch