论文标题
观察到的lyman-α光谱形状的变化，这是由于血统吸收而引起的
Variations of Observed Lyman-α Spectra Shapes due to the Intergalactic Absorption
论文作者
论文摘要
lyman-$α$（ly $α$）光谱提供了对星系中中性氢（HI）的小规模结构和运动学的见解，以及播层间介质（IgM）的电离状态。前者定义了星系的固有光谱，后者被修饰。这两个效果是退化的。使用Illustristng100模拟，我们研究了IgM对$ Z $频谱形状的影响介于$ z \ sim 0 $和$ 5 $之间。我们计算了针对不同内在光谱，红移和大规模环境的预期LY $α$峰的分布和峰不对称的分布。我们发现，常用的平均传输曲线对观察到的光谱特性产生了错误的感知。我们表明，峰值计数和不对称性的分布可以提高内在光谱和IgM吸收之间的堕落性。例如，如果星系的HI分布在宇宙学模拟的预测，我们预计如果星系的HI分布在较高的红移时变得更加多孔，我们预计会有大量的三重峰值$α$ speptra（$ z \ sim 3 $）最高30％（$ z \ sim 3 $）。我们提供了公共传输曲线目录，可用于将来的模拟和观察结果，以允许更现实的IGM处理。
Lyman-$α$ (Ly$α$) spectra provide insights into the small-scale structure and kinematics of neutral hydrogen (HI) within galaxies as well as the ionization state of the intergalactic medium (IGM). The former defines the intrinsic spectrum of a galaxy, which is modified by the latter. These two effects are degenerate. Using the IllustrisTNG100 simulation, we study the impact of the IGM on Ly$α$ spectral shapes between $z\sim 0$ and $5$. We compute the distribution of the expected Ly$α$ peaks and of the peak asymmetry for different intrinsic spectra, redshifts and large-scale environments. We find that the commonly used averaged transmission curves give an incorrect perception of the observed spectral properties. We show that the distributions of peak counts and asymmetry can lift the degeneracy between the intrinsic spectrum and the IGM absorption. For example, we expect a significant number of triple peaked Ly$α$ spectra (up to 30% at $z\sim 3$) if the galaxies' HI distribution become more porous at higher redshift as predicted by cosmological simulations. We provide a public catalog of transmission curves to be used in future simulations and observations to allow a more realistic IGM treatment.
