Analytical halo models of cosmic tidal fields
نویسندگان
چکیده
The non-linear cosmic web environment of dark matter haloes plays a major role in shaping their growth and evolution, potentially also affects the galaxies that reside them. We develop an analytical (halo model) formalism to describe tidal field anisotropic halo-centric density distributions, as characterised by tensor $\langle T_{ij} \rangle(<R)$ spherically averaged on scale $R\sim4R_{\rm vir}$ for virial radius $R_{\rm vir}$. focus axisymmetric anisotropies, which allows us explore simple intuitive toy models (sub)halo configurations exemplify some most interesting anisotropies web. build our around spherical Navarro-Frenk-White (NFW) profile after describing it Gaussian mixture, leads almost fully expressions `tidal anisotropy' scalar $\alpha(<4R_{\rm vir})$ extracted from tensor. Our examples include (i) halo at axis cylindrical filament, (ii) off-centred satellite host (iii) halo. Using these, we demonstrate several results. For example, pure filament gives $\alpha^{\rm (fil)}(<R)=1/2$ exactly, any $R$. Also, vir,sat})$ vir,sat}$ function its host-centric distance is sensitive probe dynamical mass loss environment. Finally, discuss number extensions applications can deepen understanding multi-scale phenomenology
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2021
ISSN: ['0035-8711', '1365-8711', '1365-2966']
DOI: https://doi.org/10.1093/mnras/stab359