Halo assembly bias and the tidal anisotropy of the local halo environment
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...Although the variables are now standardized, their intrinsic correlations are not necessarily linear or even monotonic (see, e.g., Figure 12 of Paranjape et al. 2018a, which shows that the median halo concentration is non-monotonic in α at fixed mass), so one might still worry about systematic…...
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...…of the halo environment; a large fraction of low-mass haloes live in highly anisotropic and biased environments10 such as cosmic filaments, unlike more isolated haloes which dominate their environment and follow the trends predicted by standard spherical collapse models (Paranjape et al. 2018a)....
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...In fact, defining α at ∼ 4× the halo radius ensures that this correlation is stronger than that between b1 and the local overdensity δ of the halo environment measured at the same scale (Paranjape et al. 2018a)....
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...As our main indicator of a halo’s non-linear local environment, we will use the tidal anisotropy variable α introduced by Paranjape et al. (2018a)....
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...…order of a few virial radii) plays an important role in the assembly bias due to halo formation epoch (Hahn et al. 2009), mass accretion rate (Fakhouri & Ma 2010; Musso et al. 2018), internal velocity dispersion structure (Borzyszkowski et al. 2017) and halo concentration (Paranjape et al. 2018a)....
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54 citations
Cites background or methods from "Halo assembly bias and the tidal an..."
...…growth can be caused by the overall tidal force from all of the surrounding haloes and structures in the matter distribution (Hahn et al. 2009; Wang et al. 2011; Paranjape et al. 2018; Musso et al. 2018), as the largest filaments and sheets generate strong tidal fields throughout their volumes....
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...Second, we carried out analysis of assembly bias described in sections 2.7 and 2.2 using αR and qR from Paranjape et al. (2018) and t from Wang et al. (2011) as proxies for the tidal anisotropy and found that all of these proxies were not as efficient at removing assembly bias as Rtidal....
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...…et al. 2008; Wang et al. 2009; Hahn et al. 2009; Wang et al. 2011; Li et al. 2013; Wetzel et al. 2014; Sunayama et al. 2016; Hearin et al. 2016b; Paranjape et al. 2018; Salcedo et al. 2018; Musso et al. 2018), their relative importance and a coherent physical picture for the origin of low-mass…...
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...Tidal forces have been proposed as a potential cause of assembly bias (Hahn et al. 2009; Wang et al. 2009; Hearin et al. 2016b; Salcedo et al. 2018; Paranjape et al. 2018) because they can slow down, stop, or reverse mass accretion....
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...Some authors have suggested that the primary feature of interest in the tidal field is its anisotropy, which can be defined in a number of ways (Wang et al. 2011; Paranjape et al. 2018)....
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References
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"Halo assembly bias and the tidal an..." refers methods in this paper
...2.1 N-body simulations We have performed N -body simulations of CDM using the tree-PM code gadget-2 (Springel 2005)3 with Np = 1024 3 particles in a cubic, periodic box....
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"Halo assembly bias and the tidal an..." refers background in this paper
...…Ωm = 0.276, baryonic matter density Ωb = 0.045, Hubble constant H0 = 100h kms −1Mpc−1 with h = 0.7, primordial scalar spectral index ns = 0.961 and r.m.s. linear fluctuations in spheres of radius 8h−1Mpc, σ8 = 0.811, with a transfer function generated by the code camb (Lewis et al. 2000).2...
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