A physical and concise halo model based on the depletion radius

Abstract

We develop a self-consistent and accurate halo model by partitioning matter according to the depletion radii of haloes. Unlike conventional models that define haloes with the virial radius while relying on a separate exclusion radius or ad-hoc fixes to account for halo exclusion, our model distributes mass across all scales self-consistently and accounts for both the virialized and non-virialized matter distribution around each halo. Using a cosmological simulation, we show that our halo definition leads to very simple and intuitive model components, with the one-halo term given by the Einasto profile with no truncation needed, and the halo-halo correlation function following a universal power-law form down to the halo boundary. The universal halo-halo correlation also allows us to easily model the distribution of unresolved haloes as well as diffuse matter. Convolving the halo profile with the halo-halo correlation function, we obtain a complete description of the halo-matter correlation across all scales, which self-consistently accounts for halo exclusion at the transition scale. Mass conservation is explicitly maintained in our model, and the scale dependence of the classical halo bias is easily reproduced. Our model can successfully reconstruct the halo-matter correlation function within an accuracy of $9\%$ for halo virial masses in the range of $10^{11.5}{h}^{-1}{\mathrm{M}}_{\odot }<M_{\mathrm{vir}}<10^{15.35}{h}^{-1}{\mathrm{M}}_{\odot }$ at $z=0$, and covers the radial range of $0.01h^{-1}\mathrm{Mpc}<r<20h^{-1}\mathrm{Mpc}$. We also show that our model profile can accurately predict the characteristic depletion radius at the minimum bias and the splash-back radius at the steepest density slope locations.

19 pages, 19 figures

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• CSST Cosmological Emulator II: Generalized Accurate Halo Mass Function Emulation
• The infall region as a complementary probe to cluster abundance
• The history and mass content of cluster galaxies in the EAGLE simulation
• The power spectrum of galaxies from large to small scales: a line-intensity mapping perspective
• Einasto profile as the halo model solution coupled to the depletion radius
• Slow neutrinos: non-linearity and momentum-space emulation
• AMICO galaxy clusters in KiDS-1000: Splashback radius from weak lensing and cluster-galaxy correlation function