LUMINOUS RED GALAXY POPULATION IN CLUSTERS AT 0.2 ≤ <i>z</i> ≤ 0.6

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dc.contributor.authorHo, Shirley
dc.contributor.authorLin, Yen-Ting
dc.contributor.authorSpergel, David
dc.contributor.authorHirata, Christopher M.
dc.date.accessioned2025-01-21T00:08:48Z
dc.date.available2025-01-21T00:08:48Z
dc.date.issued2009
dc.description.abstractWe investigate statistical properties of luminous red galaxies (LRGs) in a sample of X-ray-selected galaxy clusters at intermediate redshift (0.2 <= z <= 0.6) of mass range from similar to 1 x 10(14) M(circle dot) to similar to 8 x 10(14) M(circle dot). The LRGs are selected based on carefully designed color criteria, and the cluster membership is assessed via photometric redshifts. As clusters and LRGs are both viewed as promising tracer of the underlying dark matter distribution, understanding the distribution of LRGs within clusters is an important issue. Our main findings include ( 1) the halo occupation distribution ( HOD) of LRGs inside our cluster sample is < N(M)> = k(M/10(14)h(-1)M(circle dot)) a, where a = 0.495 +/- 0.105 and k = 1.455 +/- 0.285 assuming a Poisson distribution for N(M). If we assume the form of < N( M) > = 1 + k(M/10(14)h(-1)M(circle dot)) a, where a = 0.580 +/- 0.130 and k = 0.975 +/- 0.240 assuming a Poisson distribution for N( M). ( 2) The HOD of LRGs [ N( M)] and the satellite distribution of LRGs [N(M)-1] are both consistent with being Poisson. To be more quantitative, we find Var(N)/< N > = 1.43 +/- 0.35 and Var(N-1)/< N-1 > = 1.82 +/- 0.50. ( 3) The radial profile of LRGs within clusters when fitted with a Navarro-Frenk-White profile gives a concentration of 17.5(-4.3)(+7.1) (6.0(-1.9)(+3.2)) including (excluding) brightest LRGs (BLRGs). In essence, the BLRGs are more concentrated toward the center of the clusters than the other LRGs in clusters. We also discuss the implications of these observations on the evolution of massive galaxies in clusters.
dc.fuente.origenWOS
dc.identifier.doi10.1088/0004-637X/697/2/1358
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.1088/0004-637X/697/2/1358
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95684
dc.identifier.wosidWOS:000266159500035
dc.issue.numero2
dc.language.isoen
dc.pagina.final1368
dc.pagina.inicio1358
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectcosmology: observations
dc.subjectgalaxies: clusters: general
dc.subjectgalaxies: formation
dc.titleLUMINOUS RED GALAXY POPULATION IN CLUSTERS AT 0.2 ≤ <i>z</i> ≤ 0.6
dc.typeartículo
dc.volumen697
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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