The connection between the escape of ionizing radiation and galaxy properties at z ∼ 3 in the Keck Lyman continuum spectroscopic survey
The connection between the escape of ionizing radiation and galaxy properties at z ∼ 3 in the Keck Lyman continuum spectroscopic survey
复制标题
凯克莱曼连续谱巡天中电离辐射逃逸与 z ≤ 3 处星系特性之间的联系
DOI：
10.1093/mnras/stad774
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发表时间：
2023
影响因子：
4.8
通讯作者：
Strom, Allison L.
中科院分区：
文献类型：
--
作者：
Pahl, Anthony J.;Shapley, Alice;Steidel, Charles C.;Reddy, Naveen A.;Chen, Yuguang;Rudie, Gwen C.;Strom, Allison L.
电离辐射逃逸分数（fesc）和星系性质（如恒星质量（）、年龄、恒星形成率（SFR）和尘埃含量）之间的联系是再电离模型的关键输入，但这些关系中的许多在高红移下仍未得到检验。本文分析了凯克莱曼连续谱巡天（KLCS）中的96个星系。这些星系既有灵敏的凯克/LRIS光谱测量的莱曼连续（LyC）区域，和多波段测光，恒星的人口参数的限制。我们构建复合光谱的子样本作为星系属性的函数，并量化每个复合材料的电离光子逃逸。我们发现一个显着的反相关betefescand，符合宇宙学放大模拟的预测。我们还发现fescandE（B−V）之间存在显著的反相关性，编码了我们样本中LyC逃逸的潜在物理学。我们也没有发现fesc和恒星年龄或特定的SFR（= SFR/），挑战性的解释，同步最近的星星形成和电离逃逸的有利条件之间的显着相关性。在KLCS中，与fescus相关的星系性质是Lyα等效宽度、UV光度、SFR和E（B−V），但与年龄或sSFR无关。这种对星系性质和高红移LyC逃逸的全面分析将用于指导未来的再电离时代的模型和观测。
The connection between the escape fraction of ionizing radiation (fesc) and the properties of galaxies, such as stellar mass (), age, star-formation rate (SFR), and dust content, are key inputs for reionization models, but many of these relationships remain untested at high redshift. We present an analysis of a sample of 96∼ 3 galaxies from the Keck Lyman Continuum Spectroscopic Survey (KLCS). These galaxies have both sensitive Keck/LRIS spectroscopic measurements of the Lyman continuum (LyC) region, and multiband photometry that places constraints on stellar population parameters. We construct composite spectra from subsamples binned as a function of galaxy property and quantify the ionizing-photon escape for each composite. We find a significant anti-correlation betweenfescand, consistent with predictions from cosmological zoom-in simulations. We also find significant anti-correlation betweenfescandE(B−V), encoding the underlying physics of LyC escape in our sample. We also find no significant correlation betweenfescand either stellar age or specific SFR (= SFR/), challenging interpretations that synchronize recent star formation and favorable conditions for ionizing escape. The galaxy properties now shown to correlate withfescin the KLCS are Lyα equivalent width, UV Luminosity,, SFR, andE(B−V), but not age or sSFR. This comprehensive analysis of galaxy properties and LyC escape at high redshift will be used to guide future models and observations of the reionization epoch.