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

**Authors:** A. Palmese, J. Annis, J. Burgad, A. Farahi, M. Soares-Santos, B., Welch, M. da Silva Pereira, H. Lin, S. Bhargava, D. L. Hollowood, R., Wilkinson, P. Giles, T. Jeltema, A. K. Romer, A. E. Evrard, M. Hilton, C., Vergara Cervantes, A. Bermeo, J. Mayers, J. DeRose, D. Gruen, W. G. Hartley,, O. Lahav, B. Leistedt, T. McClintock, E. Rozo, E. S. Rykoff, T. N. Varga, R., H. Wechsler, Y. Zhang, S. Avila, D. Brooks, E. Buckley-Geer, D. L. Burke, A., Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, C. Collins,, L. N. da Costa, S. Desai, J. De Vicente, H. T. Diehl, J. P. Dietrich, P., Doel, B. Flaugher, P. Fosalba, J. Frieman, J. Garcia-Bellido, D. W. Gerdes,, R. A. Gruendl, J. Gschwend, G. Gutierrez, K. Honscheid, D. J. James, E., Krause, K. Kuehn, N. Kuropatkin, A. Liddle, M. Lima, M. A. G. Maia, R. G., Mann, J. L. Marshall, F. Menanteau, R. Miquel, R. L. C. Ogando, A. A. Plazas,, A. Roodman, P. Rooney, M. Sahlen, E. Sanchez, V. Scarpine, M. Schubnell, S., Serrano, I. Sevilla-Noarbe, F. Sobreira, J. Stott, E. Suchyta, M. E. C., Swanson, G. Tarle, D. Thomas, D. L. Tucker, P. T. P. Viana, V. Vikram, A. R., Walker

arXiv: 1903.08813 · 2020-03-04

## TL;DR

This paper introduces a stellar mass-based galaxy cluster mass proxy, $_$, validated with DES data, and demonstrates its effectiveness in estimating cluster masses through X-ray relations, offering a promising tool for cosmology.

## Contribution

The paper presents a new mass proxy based on stellar masses, validated with DES data, and establishes its relation to X-ray temperature and cluster mass, showing its potential for cosmological studies.

## Key findings

- $_$ correlates well with X-ray temperature.
- The $_$-mass relation has a slope of approximately 0.488.
- The scatter in mass at fixed $_$ is about 0.26 in natural log units.

## Abstract

We introduce a galaxy cluster mass observable, $\mu_\star$, based on the stellar masses of cluster members, and we present results for the Dark Energy Survey (DES) Year 1 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 $\mu_\star$ works as a promising mass proxy by comparing our predictions to X-ray measurements. We measure the X-ray temperature-$\mu_\star$ relation for a total of 150 clusters matched between the wide-field DES Year 1 redMaPPer catalogue, and Chandra and XMM archival observations, spanning the redshift range $0.1<z<0.7$. For a scaling relation which is linear in logarithmic space, we find a slope of $\alpha = 0.488\pm0.043$ and a scatter in the X-ray temperature at fixed $\mu_\star$ of $\sigma_{{\rm ln} T_X|\mu_\star}=0.266^{+0.019}_{-0.020}$ 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 $\mu_\star$-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 $\mu_\star$ can be used as a reliable and physically motivated mass proxy to derive cosmological constraints.

## Full text

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## Figures

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## References

86 references — full list in the complete paper: https://tomesphere.com/paper/1903.08813/full.md

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Source: https://tomesphere.com/paper/1903.08813