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Galaxies in X-ray selected clusters and groups in Dark Energy Survey data – II. Hierarchical Bayesian modelling of the red-sequence galaxy luminosity function

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posted on 2023-06-09, 18:46 authored by Y Zhang, C J Miller, Philip Rooney, A Bermeo, Kathy RomerKathy Romer, Carlos Fernando Vergara Cervantes, E S Rykoff, C Hennig, R Das, T McKay, J Song, H Wilcox, Julian Mayers, DES Collaboration, others
Using ~100 X-ray selected clusters in the Dark Energy Survey Science Verification data, we constrain the luminosity function (LF) of cluster red-sequence galaxies as a function of redshift. This is the first homogeneous optical/X-ray sample large enough to constrain the evolution of the LF simultaneously in redshift (0.1 < z < 1.05) and cluster mass (13.5 = log 10(M200crit) ~< 15.0).We pay particular attention to completeness issues and the detection limit of the galaxy sample. We then apply a hierarchical Bayesian model to fit the cluster galaxy LFs via a Schechter function, including its characteristic break (m*) to a faint end power-law slope (a). Our method enables us to avoid known issues in similar analyses based on stacking or binning the clusters. We find weak and statistically insignificant (~1.9s) evolution in the faint end slope a versus redshift. We also find no dependence in a or m* with the X-ray inferred cluster masses. However, the amplitude of the LF as a function of cluster mass is constrained to ~20 per cent precision. As a by-product of our algorithm, we utilize the correlation between the LF and cluster mass to provide an improved estimate of the individual cluster masses as well as the scatter in true mass given the X-ray inferred masses. This technique can be applied to a larger sample of X-ray or optically selected clusters from the Dark Energy Survey, significantly improving the sensitivity of the analysis.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

1

Volume

488

Page range

1-17

Department affiliated with

  • Physics and Astronomy Publications

Notes

For complete author list see article

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2019-09-13

First Open Access (FOA) Date

2019-09-13

First Compliant Deposit (FCD) Date

2019-08-28

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