期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 481, 期 1, 页码 324-340出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty2257
关键词
methods: numerical; methods: statistical; galaxies: clusters: general; galaxies: haloes; galaxies: kinematics and dynamics; cosmology: observations
资金
- Universidad Autonoma de Madrid via Centro de Excelencia Severo Ochoa Program [SEV-2012-0249]
- NSF [AST-1055081]
- European Research Council under FP7 grant [279396]
- VILLUM FONDEN [16599]
- ERC-StG 'ClustersXCosmo' [71676]
- ETAg [IUT40-2, IUT26-2]
- EU through the ERDF CoE grant [TK133, MOBTP86]
- European Regional Development Fund [EU48684]
- Instituto de Fisica Teorica (IFT-UAM/CSIC in Madrid) via Centro de Excelencia Severo Ochoa Program [SEV-2012-0249]
- STFC [ST/L000695/1] Funding Source: UKRI
The primary difficulty in measuring dynamical masses of galaxy clusters from galaxy data lies in the separation between true cluster members from interloping galaxies along the line of sight. We study the impact of membership contamination and incompleteness on cluster mass estimates obtained with 25 commonly used techniques applied to nearly 1000 mock clusters with precise spectroscopic redshifts. We show that all methods overestimate or underestimate cluster masses when applied to contaminated or incomplete galaxy samples, respectively. This appears to be the main source of the intrinsic scatter in the mass scaling relation. Applying corrections based on a prior knowledge of contamination and incompleteness can reduce the scatter to the level of shot noise expected for poorly sampled clusters. We establish an empirical model quantifying the effect of imperfect membership on cluster mass estimation and discuss its universal and method-dependent features. We find that both imperfect membership and the response of the mass estimators depend on cluster mass, effectively causing a flattening of the estimated-true mass relation. Imperfect membership thus alters cluster counts determined from spectroscopic surveys, hence the cosmological parameters that depend on such counts.
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