The Faint Host Galaxies of C IV Absorbers at z > 5
  We explore the expected galaxy environments of CIV absorbers at z>5 using the
Technicolor Dawn simulations. These simulations reproduce the observed history
of reionization, the z~6 galaxy stellar mass function, the Ly$\alpha$ forest
transmission at z>5, and the SiIV column density distribution (CDD) at z~5.5.
Nonetheless, the CIV CDD remains underproduced. Comparison with observed
CII/SiII equivalent width ratios and the CII line incidence suggests that a low
carbon yield accounts for some, but not all, of the CIV discrepancy.
Alternatively, a density-bounded escape scenario could harden the metagalactic
ionizing background more dramatically even than binary stellar evolution,
boosting the CIV CDD into near-agreement with observations. In this case
galaxies ionize more efficiently and fewer are required to host a given
high-ionization absorber. Absorbers' environments therefore constrain ionizing
escape. Regardless of the escape scenario, galaxies correlate with CIV
absorbers out to 300 proper kpc (pkpc). The correlation strengthens
independently with galaxy luminosity and CIV column density. Around strong
systems (log(N$_{\rm CIV}$/cm$^{-2}$)>14)), the overdensity of galaxies with
M$_{\rm UV}$<-18 or log($L_{{\rm Ly}\alpha}$/erg s$^{-1}$) > 41.9 declines from
200-300 within 100 pkpc to 40-60 within 250 pkpc. The previously-suggested
association between strong CIV absorbers and Ly$\alpha$ emitters at z>5 is not
expected. It may arise if both populations inhabit large-scale voids, but for
different reasons. Although most neighboring galaxies are too faint for HST,
JWST will, with a single pointing, identify ~10 neighboring galaxies per strong
CIV absorber at z > 5. Ground-based tests of these predictions are possible via
deep surveys for Ly$\alpha$ emission using integral field units.
