Evidence of Halo Assembly Bias in Massive Clusters

Hironao Miyatake, Surhud More, Masahiro Takada, David N. Spergel, Rachel Mandelbaum, Eli S. Rykoff, Eduardo Rozo

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

We present significant evidence of halo assembly bias for SDSS redMaPPer galaxy clusters in the redshift range [0.1, 0.33]. By dividing the 8,648 clusters into two subsamples based on the average member galaxy separation from the cluster center, we first show that the two subsamples have very similar halo mass of M200m≃1.9×1014 h-1M based on the weak lensing signals at small radii R 10 h-1Mpc. However, their halo bias inferred from both the large-scale weak lensing and the projected autocorrelation functions differs by a factor of ∼1.5, which is a signature of assembly bias. The same bias hypothesis for the two subsamples is excluded at 2.5σ in the weak lensing and 4.4σ in the autocorrelation data, respectively. This result could bring a significant impact on both galaxy evolution and precision cosmology.

Original languageEnglish (US)
Article number041301
JournalPhysical Review Letters
Volume116
Issue number4
DOIs
StatePublished - Jan 25 2016

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halos
assembly
galaxies
autocorrelation
cosmology
signatures
radii

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Miyatake, H., More, S., Takada, M., Spergel, D. N., Mandelbaum, R., Rykoff, E. S., & Rozo, E. (2016). Evidence of Halo Assembly Bias in Massive Clusters. Physical Review Letters, 116(4), [041301]. https://doi.org/10.1103/PhysRevLett.116.041301

Evidence of Halo Assembly Bias in Massive Clusters. / Miyatake, Hironao; More, Surhud; Takada, Masahiro; Spergel, David N.; Mandelbaum, Rachel; Rykoff, Eli S.; Rozo, Eduardo.

In: Physical Review Letters, Vol. 116, No. 4, 041301, 25.01.2016.

Research output: Contribution to journalArticle

Miyatake, H, More, S, Takada, M, Spergel, DN, Mandelbaum, R, Rykoff, ES & Rozo, E 2016, 'Evidence of Halo Assembly Bias in Massive Clusters', Physical Review Letters, vol. 116, no. 4, 041301. https://doi.org/10.1103/PhysRevLett.116.041301
Miyatake H, More S, Takada M, Spergel DN, Mandelbaum R, Rykoff ES et al. Evidence of Halo Assembly Bias in Massive Clusters. Physical Review Letters. 2016 Jan 25;116(4). 041301. https://doi.org/10.1103/PhysRevLett.116.041301
Miyatake, Hironao ; More, Surhud ; Takada, Masahiro ; Spergel, David N. ; Mandelbaum, Rachel ; Rykoff, Eli S. ; Rozo, Eduardo. / Evidence of Halo Assembly Bias in Massive Clusters. In: Physical Review Letters. 2016 ; Vol. 116, No. 4.
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