论文标题
Lyman Alpha发射极线的演变从z = 5.7到z = 6.6
The Evolution of Lyman Alpha Emitter Line Widths from z=5.7 to z=6.6
论文作者
论文摘要
最近的证据表明，具有Logl（Ly-Alpha）> 43.5 ERG/S的高红移Ly-Alpha发射星系（LAES），称为超浮标的LAE（ULLAES），比红什夫特Z = 5.7-6.6中的低光度LAE显示出比低亮度LAE的进化较少。在这里，我们在此红移间隔内探索了LAES中Ly-Alpha发射线的速度宽度的红移演变。我们使用来自Subaru/Hyper Suprime-CAM的新宽场观测值，提供24 z = 6.6和12 z = 5.7 laes的样本，其中log L（ly-alpha）> 43 erg/s，所有这些都有来自Keck/deimos的后续光谱。与档案较低的亮度数据相结合，我们发现Logl（Ly-Alpha）<43.25 erg/s的Laes中Ly-Alpha线的显着狭窄 - 略低于通常的Ullae定义 - 相对于Z = 5.7时的Z = 6.6，但我们在较高的Lumuminosity Laes中看不到。随着我们转移到更高的红移时，层间介质的中立性的增加应增加Ly-Alpha线的散射，从而使其更窄。在较高的发光性LAE中没有这种作用表明它们可能位于更高度电离的区域，这是由于播层间培养基的散射作用而自挡的。
Recent evidence suggests that high-redshift Ly-alpha emitting galaxies (LAEs) with logL(Ly-alpha) > 43.5 erg/s, referred to as ultraluminous LAEs (ULLAEs), may show less evolution than lower-luminosity LAEs in the redshift range z=5.7-6.6. Here we explore the redshift evolution of the velocity widths of the Ly-alpha emission lines in LAEs over this redshift interval. We use new wide-field, narrowband observations from Subaru/Hyper Suprime-Cam to provide a sample of 24 z=6.6 and 12 z=5.7 LAEs with log L(Ly-alpha) > 43 erg/s, all of which have follow-up spectroscopy from Keck/DEIMOS. Combining with archival lower-luminosity data, we find a significant narrowing of the Ly-alpha lines in LAEs at logL(Ly-alpha) < 43.25 erg/s -- somewhat lower than the usual ULLAE definition -- at z = 6.6 relative to those at z = 5.7, but we do not see this in higher-luminosity LAEs. As we move to higher redshifts, the increasing neutrality of the intergalactic medium should increase the scattering of the Ly-alpha lines, making them narrower. The absence of this effect in the higher-luminosity LAEs suggests they may lie in more highly ionized regions, self-shielding from the scattering effects of the intergalactic medium.
