Halo assembly bias and the tidal anisotropy of the local halo environment
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TLDR
In this article, the role of the local tidal environment in determining the assembly bias of dark matter haloes was studied, using correlations between the large-scale and small-scale environments of simulated haloes at z = 0 with masses between 10^11.6 and 10^14.9.Abstract:
We study the role of the local tidal environment in determining the assembly bias of dark matter haloes. Previous results suggest that the anisotropy of a halo's environment (i.e. whether it lies in a filament or in a more isotropic region) can play a significant role in determining the eventual mass and age of the halo. We statistically isolate this effect, using correlations between the large-scale and small-scale environments of simulated haloes at z = 0 with masses between 10^11.6 ≲ (m/h^−1 M_⊙) ≲ 10^14.9. We probe the large-scale environment, using a novel halo-by-halo estimator of linear bias. For the small-scale environment, we identify a variable α_R that captures the tidal anisotropy in a region of radius R = 4R_200b around the halo and correlates strongly with halo bias at fixed mass. Segregating haloes by α_R reveals two distinct populations. Haloes in highly isotropic local environments (α_R ≲ 0.2) behave as expected from the simplest, spherically averaged analytical models of structure formation, showing a negative correlation between their concentration and large-scale bias at all masses. In contrast, haloes in anisotropic, filament-like environments (α_R ≳ 0.5) tend to show a positive correlation between bias and concentration at any mass. Our multiscale analysis cleanly demonstrates how the overall assembly bias trend across halo mass emerges as an average over these different halo populations, and provides valuable insights towards building analytical models that correctly incorporate assembly bias. We also discuss potential implications for the nature and detectability of galaxy assembly bias.read more
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References
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Journal ArticleDOI
Evidence of Halo Assembly Bias in Massive Clusters.
Hironao Miyatake,Hironao Miyatake,Hironao Miyatake,Surhud More,Masahiro Takada,David N. Spergel,David N. Spergel,Rachel Mandelbaum,Eli S. Rykoff,Eli S. Rykoff,Eduardo Rozo +10 more
TL;DR: Significant evidence of halo assembly bias for SDSS redMaPPer galaxy clusters in the redshift range is presented, which could bring a significant impact on both galaxy evolution and precision cosmology.
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Mergers and mass accretion for infalling halos both end well outside cluster virial radii
Peter Behroozi,Peter Behroozi,Risa H. Wechsler,Yu Lu,Oliver Hahn,Michael T. Busha,Michael T. Busha,Anatoly Klypin,Joel R. Primack +8 more
TL;DR: In this paper, the authors show that infalling dark matter halos (i.e., the progenitors of satellite halos) begin losing mass well outside the virial radius of their eventual host halos.
Journal ArticleDOI
Gravitational redshift of galaxies in clusters as predicted by general relativity
TL;DR: An observation of the gravitational redshift of light coming from galaxies in clusters at the 99% confidence level is reported, which agrees with the predictions of general relativity and its modification created to explain cosmic acceleration without the need for dark energy.
Journal ArticleDOI
Subhalo abundance matching and assembly bias in the EAGLE simulation
Jonás Chaves-Montero,Raul E. Angulo,Joop Schaye,Matthieu Schaller,Robert A. Crain,Michelle Furlong,Tom Theuns +6 more
TL;DR: In this article, the authors examined the performance, implementation, and assumptions of SHAM using the EAGLE project simulations and found that Vrelax, the highest value of the circular velocity attained by a sub-halo while it satisfies a relaxation criterion, is the subhalo property that correlates most strongly with galaxy stellar mass (Mstar).
Journal ArticleDOI
Internal properties and environments of dark matter haloes
TL;DR: In this paper, the authors used seven high-resolution N-body simulations to study the correlations among different halo properties (assembly time, spin, shape and substructure) and how these properties are correlated with the large-scale environment in which haloes reside.