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- W2147506964 abstract "We analyze the angular clustering of z ∼ 2.3 distant red galaxies (DRGs) measured by Quardi et al. We find that, with robust estimates of the measurement errors and realistic halo occupation distribution modeling, the measured clustering can be well fit within standard halo occupation models, in contrast to previous results. However, in order to fit the strong break in w(θ) at θ = 10'', nearly all satellite galaxies in the DRG luminosity range are required to be DRGs. Within this luminosity-threshold sample, the fraction of galaxies that are DRGs is ∼44%, implying that the formation of DRGs is more efficient for satellite galaxies than for central galaxies. Despite the evolved stellar populations contained within DRGs at z = 2.3, 90% of satellite galaxies in the DRG luminosity range have been accreted within 500 Myr. Thus, satellite DRGs must have known they would become satellites well before the time of their accretion. This implies that the formation of DRGs correlates with large-scale environment at fixed halo mass, although the large-scale bias of DRGs can be well fit without such assumptions. Further data are required to resolve this issue. Using the observational estimate that ∼30% of DRGs have no ongoing star formation, we infer a timescale for star formation quenching for satellite galaxies of 450 Myr, although the uncertainty on this number is large. However, unless all non-star-forming satellite DRGs were quenched before accretion, the quenching timescale is significantly shorter than z ∼ 0 estimates. Down to the completeness limit of the Quadri et al. sample, we find that the halo masses of central DRGs are ∼50% higher than non-DRGs in the same luminosity range, but at the highest halo masses the central galaxies are DRGs only ∼2/3 of the time." @default.
- W2147506964 created "2016-06-24" @default.
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- W2147506964 date "2009-12-29" @default.
- W2147506964 modified "2023-10-17" @default.
- W2147506964 title "INTERPRETING THE CLUSTERING OF DISTANT RED GALAXIES" @default.
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- W2147506964 doi "https://doi.org/10.1088/0004-637x/709/1/67" @default.
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