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- W2994133886 abstract "ABSTRACT We investigate if, for a fixed number density of targets and redshift, there is an optimal way to select a galaxy sample in order to measure the baryon acoustic oscillation (BAO) scale, which is used as a standard ruler to constrain the cosmic expansion. Using the mock galaxy catalogue built by Smith et al. in the Millennium-XXL N-body simulation with a technique to assign galaxies to dark matter haloes based on halo occupation distribution modelling, we consider the clustering of galaxies selected by luminosity, colour and local density. We assess how well the BAO scale can be extracted by fitting a template to the power spectrum measured for each sample. We find that the BAO peak position is recovered equally well for samples defined by luminosity or colour, while there is a bias in the BAO scale recovered for samples defined by density. The BAO position is contracted to smaller scales for the densest galaxy quartile and expanded to large scales for the two least dense galaxy quartiles. For fixed galaxy number density, density-selected samples have higher uncertainties in the recovered BAO scale than luminosity- or colour-selected samples." @default.
- W2994133886 created "2019-12-13" @default.
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- W2994133886 date "2020-04-10" @default.
- W2994133886 modified "2023-10-14" @default.
- W2994133886 title "Measuring the baryon acoustic oscillation peak position with different galaxy selections" @default.
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- W2994133886 doi "https://doi.org/10.1093/mnras/staa973" @default.
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