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• W3100337128 endingPage "115" @default.
• W3100337128 startingPage "115" @default.
• W3100337128 abstract "Clustering of dark matter halos has been shown to depend on halo properties beyond mass, such as halo concentration, a phenomenon referred to as halo assembly bias. Standard halo-occupation models (HOD) in large-scale structure studies assume that halo mass alone is sufficient in characterizing the connection between galaxies and halos. Modeling of galaxy clustering can face systematic effects if the number of galaxies within a halo is correlated with other halo properties. Using the Small MultiDark-Planck high-resolution N-body simulation and the clustering measurements of the Sloan Digital Sky Survey DR7 main galaxy sample, we investigate the extent to which the concentration dependence of halo occupation can be constrained. Furthermore, we study how allowing for the concentration dependence can improve our modeling of galaxy clustering. Our constraints on HOD with assembly bias suggest that satellite population is not correlated with halo concentration at fixed halo mass. At fixed halo mass, our constraints favor lack of correlation between the occupation of centrals and halo concentration in the most luminous samples (Mr < −21.5, −21), and modest correlation in the Mr < −20.5, −20, −19.5 samples. We show that, in comparison with abundance-matching mock catalogs, our findings suggest qualitatively similar but modest levels of the impact of halo assembly bias on galaxy clustering. The effect is only present in the central occupation and becomes less significant in brighter galaxy samples. Furthermore, by performing model comparison based on information criteria, we find that in most cases, the standard mass-only HOD model is still favored by the observations." @default.
• W3100337128 created "2020-11-23" @default.
• W3100337128 creator A5060984452 @default.
• W3100337128 creator A5075169680 @default.
• W3100337128 date "2019-02-14" @default.
• W3100337128 modified "2023-10-18" @default.
• W3100337128 title "How Are Galaxies Assigned to Halos? Searching for Assembly Bias in the SDSS Galaxy Clustering" @default.
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