HOD modelling of high redshift galaxies using the BLUETIDES simulation

Abstract

We construct halo occupation distribution (HOD) models of high redshift ($z\gtrsim 7.5$) galaxies with $M_{\ast }>10^8{M}_{\odot }/h$ using the BlueTides hydrodynamic simulation suite, with a particular emphasis on modelling the small scale / 1-halo clustering ($0.01\lesssim r\lesssim 1h^{-1}\mathrm{Mpc}$). Similar to low redshift studies, we find that the central and satellite mean HODs ($⟨N_{\mathrm{cen}}⟩$ and $⟨N_{\mathrm{sat}}⟩$) can be modeled by a smoothed step function and a power law respectively. The number density of satellite galaxies is however significantly suppressed compared to low redshift (satellite fractions drop from $\sim 50\%$ at $z=0$ to $\lesssim 10\%$ at $z=7.5$). The mean number of satellites, $⟨N_{\mathrm{sat}}⟩<1$ for halo masses below $3\times 10^{11}{M}_{\odot }/h$ (a rare halo at these redshifts). For the radial number density profiles, satellites with $10^8\lesssim M^{\ast }\lesssim 10^9{M}_{\odot }/h$ in halos with $M_H\gtrsim 3\times 10^{11}{M}_{\odot }/h$ are consistent with NFW (with concentrations $c_{\mathrm{sat}}\sim 10-40$). Within halos of mass $M_H\lesssim 3\times 10^{11}{M}_{\odot }/h$ satellites exhibit a power law profile with slope -3. Because these halos dominate the small scale clustering, the resulting 1-halo term is steeper than predicted using standard NFW profiles. Using this power-law profile for satellites, we can successfully reproduce the small-scale clustering exhibited by BlueTides galaxies using HOD modelling. We predict the highest probability of detecting satellites at $z>7.5$ is around centrals of $M^{\ast }\sim 3\times 10^{10}{M}_{\odot }/h$ (with $M^{\ast }\gtrsim$ a few $10^7{M}_{\odot }/h$ ). This should be achievable with the James Webb Space Telescope (JWST).

arXiv comment14

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