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The clustering of z > 7 galaxies: Predictions from the BLUETIDES simulation

Monthly Notices of the Royal Astronomical Society, ISSN: 1365-2966, Vol: 474, Issue: 4, Page: 5393-5405
2018
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Article Description

We study the clustering of the highest z galaxies (from ~0.1 to a few tens Mpc scales) using the BLUETIDES simulation and compare it to current observational constraints from Hubble legacy and Hyper Suprime Cam (HSC) fields (at z = 6-7.2). With a box length of 400 Mpc h-1 on each side and 0.7 trillion particles, BLUETIDES is the largest volume highresolution cosmological hydrodynamic simulation to date ideally suited for studies of high-z galaxies. We find that galaxies with magnitude mUV < 27.7 have a bias (b) of 8.1 ± 1.2 at z = 8, and typical halo masses M ≳ 6 × 10M. Given the redshift evolution between z = 8 and z = 10 [b α (1 + z)], our inferred values of the bias and halo masses are consistent with measured angular clustering at z ~ 6.8 from these brighter samples. The bias of fainter galaxies (in the Hubble legacy field at H ≲ 29.5) is 5.9 ± 0.9 at z = 8 corresponding to halo masses M ≳ 10M. We investigate directly the 1-halo term in the clustering and show that it dominates on scales r ≲ 0.1 Mpc h (Θ ≲ 3 arcsec) with non-linear effect at transition scales between the one-halo and two-halo term affecting scales 0.1 Mpc h≲ r ≲ 20 Mpc h (3 arcsec ≲ Θ ≲ 90 arcsec). Current clustering measurements probe down to the scales in the transition between one-halo and two-halo regime where non-linear effects are important. The amplitude of the one-halo term implies that occupation numbers for satellites in BLUETIDES are somewhat higher than standard halo occupation distributions adopted in these analyses (which predict amplitudes in the one-halo regime suppressed by a factor 2-3). That possibly implies a higher number of galaxies detected by JWST (at small scales and even fainter magnitudes) observing these fields.

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