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Neutral gas and the escape of ionizing radiation: Lessons from the low-redshift Green Peas

机译:中性气体和电离辐射的逃逸:低射频绿豆的课程

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How galaxies reionized the universe remains an open question, but we can gain insights from the low-redshift Green Pea galaxies, one of the only known populations of Lyman continuum (LyC) emitters. Using VLA H I 21 cm observations and HST UV spectra of Green Peas, we investigate how neutral gas content and geometry influence LyC and Lyα escape. Our results suggest that LyC Emitters may have high ratios of star formation rate to H I mass. Low gas covering fractions are common among the population, but not all sightlines are optically thin. Based on the observed relationship between high ionization parameters, low metallicities, and narrow Lyα profiles, we propose that weak stellar feedback at low metallicities results in a gas geometry of dense clumps within a low-density medium, which facilitates Lyα and LyC escape. We address the implications of these results for identifying LyC emitters at high redshift with JWST and ALMA.
机译:星系如何为宇宙标准宇宙仍然是一个开放的问题,但我们可以从低射频绿豌豆星系中获得洞察力,其中一个已知的Lyman Continuum(Lyc)发射者。 使用vla h i 21 cm观察和绿豆的HST紫外光光谱,我们调查中性气体含量和几何影响Lyc和Lyα逃逸。 我们的研究结果表明,LYC发射器可能具有高比例的星形成率至H i块。 低气体覆盖级分在群体中是常见的,但并非所有视野都是光学薄的。 基于高电离参数,低金属和窄的LYα型材之间的观察到的关系,我们提出了低金属性的弱恒星反馈导致低密度介质内的致密团块的气体几何形状,这有利于Lyα和Lyc逃生。 我们解决了这些结果的含义,以便在JWST和ALMA的高射频处识别LYC发射器。

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