论文标题
C> 5处C IV吸收器的微弱宿主星系
The Faint Host Galaxies of C IV Absorbers at z > 5
论文作者
论文摘要
我们使用Technicolor Dawn模拟在Z> 5时探索CIV吸收器的预期星系环境。这些模拟重现了观察到的电离历史，Z〜6星系恒星质量函数，Z> 5时的LY $α$森林传输以及Z〜5.5时的SIIV柱密度分布（CDD）。尽管如此，CIV CDD仍然生产不足。与观察到的CII/SIII等效宽度比和CII线的发生率的比较表明，低碳产量占CIV差异的某些但不是全部。另外，与二进制恒星进化相比，与密度结合的逃生场景甚至可以更急剧地变化元层状电离背景，从而使CIV CDD与观测值相关联。在这种情况下，星系将更有效地电离，并且需要更少的人来容纳给定的高电离吸收器。因此，吸收者的环境限制了电离逃逸。不管逃生方案如何，星系都与CIV吸收器相关，将其与300个适当的KPC（PKPC）相关。相关性与星系光度和CIV柱密度独立增强。围绕强系统（log（n $ _ {\ rm civ} $/cm $^{ - 2} $）> 14），），带有m $ _ {\ rm uv} $ <-18或log <-18或log（$ l _ {$ l _ {\ rm ly} $/erg s $/erg s $^$ 1}的星系的过度密度。 PKPC至250 pkpc之内40-60。预计在Z> 5时，强大的CIV吸收器与Ly $α$发射器之间的遇到的关联是不可预计的。如果两个人口都居住在大规模的空隙，但出于不同的原因，可能会产生。尽管大多数相邻的星系对于HST来说太微弱了，但JWST将带有单个指向，在Z> 5处识别每个强烈的CIV吸收器约10个相邻星系。通过对LY $α$发射的深度调查，可以使用整体场单元对这些预测进行地面测试。
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$α$ 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($L_{{\rm Ly}α}$/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$α$ 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$α$ emission using integral field units.
