论文标题
低红移Lyman Continuum调查II：对LYC诊断的新见解
The Low-Redshift Lyman Continuum Survey II: New Insights into LyC Diagnostics
论文作者
论文摘要
由于与乳突间H I吸收，无法观察到在电离的时期（z {\ gtrsim} 6）上观察到Lyman Continuum（Lyc）。为了识别Lyman Continuum发射器（LCE）并推断逃脱LYC的比例，天文学家已经开发了LYC Escape的各种间接诊断。使用低降射Lyman Continuum Consume（LZLC）的LYC测量，我们介绍了这些诊断的首次统计检验。虽然基于LYα的光学深度指标（例如峰值速度分离和等效宽度）表现良好，但我们还发现其他诊断（例如[O III]/[O II]通量比率和星形形成速率表面密度，预测星系是否为LCE）。这些星系性能与逃逸LYC通量的比例之间的关系表明，LYC逃逸在很大程度上取决于H I色谱柱密度，电离参数和恒星反馈。我们发现LCE占据了一系列恒星质量，金属性，恒星形成历史和电离参数，这可能表明LYC逃脱的情节性和/或不同的物理原因。
The Lyman continuum (LyC) cannot be observed at the epoch of reionization (z {\gtrsim} 6) due to intergalactic H I absorption. To identify Lyman continuum emitters (LCEs) and infer the fraction of escaping LyC, astronomers have developed various indirect diagnostics of LyC escape. Using measurements of the LyC from the Low-redshift Lyman Continuum Survey (LzLCS), we present the first statistical test of these diagnostics. While optical depth indicators based on Lyα, such as peak velocity separation and equivalent width, perform well, we also find that other diagnostics, such as the [O III]/[O II] flux ratio and star formation rate surface density, predict whether a galaxy is a LCE. The relationship between these galaxy properties and the fraction of escaping LyC flux suggests that LyC escape depends strongly on H I column density, ionization parameter, and stellar feedback. We find LCEs occupy a range of stellar masses, metallicities, star formation histories, and ionization parameters, which may indicate episodic and/or different physical causes of LyC escape.
