X-ray scaling relations from a complete sample of the richest maxBCG clusters
Here, we use a complete sample of 38 richest maxBCG clusters to study the ICM–galaxy scaling relations and the halo mass selection properties of the maxBCG algorithm, based on X-ray and optical observations. The clusters are selected from the two largest bins of optical richness in the Planck stacking work with the maxBCG richness N200 ≥ 78. We analyse their Chandra and XMM–Newton data to derive the X-ray properties of the ICM. We then use the distribution of P(X|N), X = TX, LX, YX, to study the mass selection P(M|N) of maxBCG. Compared with previous works based on the whole richness sample, a significant fraction of blended systems with boosted richness is skewed into this richest sample. Parts of the blended haloes are picked apart by the redMaPPer, an updated red-sequence cluster finding algorithm with lower mass scatter. Moreover, all the optical blended haloes are resolved as individual X-ray haloes, following the established LX-TX and LX-YX relations. We further discuss that the discrepancy between ICM–galaxy scaling relations, especially for future blind stacking, can come from several factors, including miscentring, projection, contamination of low-mass systems, mass bias, and covariance bias. We also evaluate the fractions of relaxed and cool core clusters in our sample. Both are smaller than those from SZ or X-ray selected samples. Moreover, disturbed clusters show a higher level of mass bias than relaxed clusters.
- Research Organization:
- Univ. of Arizona, Tucson, AZ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
- Grant/Contract Number:
- SC0015975; NNX16AH32G; NNX16AH26G; NAS8-03060; FG-2016-6443; 1513618; AST-1412768
- OSTI ID:
- 1612350
- Journal Information:
- Monthly Notices of the Royal Astronomical Society, Vol. 484, Issue 2; ISSN 0035-8711
- Publisher:
- Royal Astronomical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Mass variance from archival X-ray properties of Dark Energy Survey Year-1 galaxy clusters
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journal | September 2019 |
The redshift evolution of X-ray and Sunyaev–Zel’dovich scaling relations in the fable simulations
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journal | August 2019 |
The redshift evolution of X-ray and Sunyaev-Zel'dovich scaling relations in the FABLE simulations
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| The redshift evolution of X-ray and Sunyaev-Zel'dovich scaling relations in the FABLE simulations | text | January 2019 |
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