论文标题
高红移阻尼的Ly-Alpha吸收星系模型，再现N（HI）-Z分布
High-redshift Damped Ly-alpha Absorbing Galaxy Model Reproducing the N(HI)-Z Distribution
论文作者
论文摘要
我们研究了在Z〜2-3处的lyman-$α$吸收器（DLA）如何在大型的类星体光学光谱调查中检测到，并追踪星形星系的种群。在先前的结果基础上，我们基于观察到的缩放关系构建了一个模型，以重现金属性，Z和HI柱密度的双变量分布，n（hi）。此外，与DLA相关的星系的观察到的影响参数与模型预测一致。该模型强烈利用金属梯度，其尺寸缩放为主机星系的光度，值为$γ$* = -0.019 $ \ pm $ 0.008 dex kpc $^{ - 1} $ f for L* Galaxies，对于Fainter Galaxies而言变得更加陡峭。我们发现DLA在各种星系光度范围内追踪星系，但是，DLA横截面的大部分是在z〜2.5时l〜0.1 l*的星系中出现的，与数值模拟广泛一致。
We investigate how damped Lyman-$α$ absorbers (DLAs) at z ~ 2-3, detected in large optical spectroscopic surveys of quasars, trace the population of star-forming galaxies. Building on previous results, we construct a model based on observed and physically motivated scaling relations in order to reproduce the bivariate distributions of metallicity, Z, and HI column density, N(HI). Furthermore, the observed impact parameters for galaxies associated to DLAs are in agreement with the model predictions. The model strongly favours a metallicity gradient, which scales with the luminosity of the host galaxy, with a value of $γ$* = -0.019 $\pm$ 0.008 dex kpc$^{-1}$ for L* galaxies that gets steeper for fainter galaxies. We find that DLAs trace galaxies over a wide range of galaxy luminosities, however, the bulk of the DLA cross-section arises in galaxies with L ~ 0.1 L* at z ~ 2.5 broadly consistent with numerical simulations.
