HOD modelling of high redshift galaxies using the BLUETIDES simulation
AK Bhowmick, D Campbell, T DiMatteo… - arXiv preprint arXiv …, 2018 - arxiv.org
arXiv preprint arXiv:1806.10612, 2018•arxiv.org
We construct halo occupation distribution (HOD) models of high redshift ($ z\gtrsim 7.5$)
galaxies with $ M_ {*}> 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 1~ h^{-1}\rm {Mpc} $). Similar to low redshift studies, we find that the
central and satellite mean HODs ($\left< N_ {\mathrm {cen}}\right> $ and $\left< N_ {\mathrm
{sat}}\right> $) can be modeled by a smoothed step function and a power law respectively …
galaxies with $ M_ {*}> 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 1~ h^{-1}\rm {Mpc} $). Similar to low redshift studies, we find that the
central and satellite mean HODs ($\left< N_ {\mathrm {cen}}\right> $ and $\left< N_ {\mathrm
{sat}}\right> $) can be modeled by a smoothed step function and a power law respectively …
We construct halo occupation distribution (HOD) models of high redshift () galaxies with using the BlueTides hydrodynamic simulation suite, with a particular emphasis on modelling the small scale / 1-halo clustering (). Similar to low redshift studies, we find that the central and satellite mean HODs ( and ) 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 at to at ). The mean number of satellites, for halo masses below (a rare halo at these redshifts). For the radial number density profiles, satellites with in halos with are consistent with NFW (with concentrations ). Within halos of mass 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 is around centrals of (with a few ). This should be achievable with the James Webb Space Telescope (JWST).
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