论文标题
在Z〜5.7处散布的Lyman-Alpha光晕左右约300个光谱确认的Lyman-Alpha发射器
Diffuse Lyman-alpha Halos around ~300 Spectroscopically Confirmed Lyman-alpha Emitters at z ~ 5.7
论文作者
论文摘要
我们通过堆叠310个光谱确认的Lyman-Alpha（LAES），报告了在$ z \ sim 5.7 $的星形星系周围的弥漫性Lyman-Alpha Halos（LAHS）的检测。从我们对星系的光谱调查$ z> 5.5 $中，大多数LAE都可以确定。它们都位于具有深度窄带和宽带成像数据的经过深入研究的领域。我们将LAE样品及其子样本组合在窄带NB816（即Lyman-Alpha频段）和$ z $ band（即连续体频段）中。通过比较堆叠的对象与它们的相应点扩散函数，我们清楚地检测到了这些LAE周围的扩展LAH。我们对统计和系统错误进行复杂的模拟和分析，并确认检测到的光晕不是由错误引起的。当通过双组分模型描述时，LAH的比例长度从1.2到5.3 kpc，典型值为$ \ sim $ 2 kpc。我们样本中的LAH尺寸与VLT/MUSE测量的类似红移的单个LAE的尺寸一致，但在以前的研究中相对较小的LAE的尺寸。我们还发现，具有较高Lyman-Alpha亮度的LAE，较高的紫外线连续性发光度或较小的Lyman-Alpha等效宽度往往具有较大的LAH尺寸。我们的结果与lahs源于圆形培养基中H I气体的散射光的情况一致。
We report the detection of diffuse Lyman-alpha halos (LAHs) around star-forming galaxies at $z \sim 5.7$ by stacking 310 spectroscopically confirmed Lyman-alpha (LAEs). The majority of the LAEs are identified from our spectroscopic survey of galaxies at $z>5.5$. They are all located in well-studied fields with deep narrowband and broadband imaging data. We combine the LAE sample and its subsamples in the narrowband NB816 (i.e., the Lyman-alpha band) and $z$ band (i.e., the continuum band). By comparing the stacked objects with their corresponding point spread functions, we clearly detect extended LAHs around these LAEs. We perform sophisticated simulations and analyses on statistical and systematic errors, and confirm that the detected halos are not caused by errors. The scale lengths of the LAHs, when described by a double-component model, range from 1.2 to 5.3 kpc with a typical value of $\sim$2 kpc. The LAH sizes from our sample are in agreement with those of individual LAEs at the similar redshift measured by VLT/MUSE, but are relatively smaller than those of photometrically selected LAEs in previous studies. We also find that LAEs with higher Lyman-alpha luminosities, higher UV continuum luminosities or smaller Lyman-alpha equivalent widths tend to have larger LAH sizes. Our results are consistent with a scenario that LAHs originate from the scattered light of the central galaxies by H I gas in the circumgalactic medium.
