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Kugel, R, Schaye, J, Schaller, M, McCarthy, IG, Braspenning, J, Helly, JC, Forouhar Moreno, VJ and McGibbon, RJ (2024) The FLAMINGO project: A comparison of galaxy cluster samples selected on mass, X-ray luminosity, Compton-Y parameter, or galaxy richness. Monthly Notices of the Royal Astronomical Society, 534 (3). pp. 2378-2396. ISSN 0035-8711
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The FLAMINGO project A comparison of galaxy cluster samples selected on mass, X-ray luminosity, Compton-Y parameter, or galaxy richness.pdf - Published Version Available under License Creative Commons Attribution. Download (2MB) | Preview |
Abstract
Galaxy clusters provide an avenue to expand our knowledge of cosmology and galaxy evolution. Because it is difficult to accurately measure the total mass of a large number of individual clusters, cluster samples are typically selected using an observable proxy for mass. Selection effects are therefore a key problem in understanding galaxy cluster statistics. We make use of the FLAMINGO hydrodynamical simulation to investigate how selection based on X-ray luminosity, thermal Sunyaev-Zeldovich effect or galaxy richness influences the halo mass distribution. We define our selection cuts based on the median value of the observable at a fixed mass and compare the resulting samples to a mass-selected sample. We find that all samples are skewed towards lower mass haloes. For X-ray luminosity and richness cuts below a critical value, scatter dominates over the trend with mass and the median mass becomes biased increasingly low with respect to a mass-selected sample. At, observable cuts corresponding to median halo masses between and give nearly unbiased median masses for all selection methods, but X-ray selection results in biased medians for higher masses. For cuts corresponding to median masses at and for all masses at, only Compton-Y selection yields nearly unbiased median masses. Importantly, even when the median mass is unbiased, the scatter is not because for each selection the sample is skewed towards lower masses than a mass-selected sample. Each selection leads to a different bias in secondary quantities like cool-core fraction, temperature, and gas fraction.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | galaxies: clusters: general; galaxies: clusters: intracluster medium; large-scale structure of Universe; X-rays: galaxies: clusters; 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press (OUP) |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 13 Nov 2024 12:38 |
| Last Modified: | 13 Nov 2024 12:45 |
| DOI or ID number: | 10.1093/mnras/stae2218 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24759 |
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