Searching for the connection between ionizing-photon escape and the surface density of star formation at z ∼ 3
Searching for the connection between ionizing-photon escape and the surface density of star formation at z ∼ 3
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寻找电离光子逃逸与 z ≤ 3 处恒星形成表面密度之间的联系
DOI：
10.1093/mnras/stac1767
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发表时间：
2022
影响因子：
4.8
通讯作者：
Chen, Yuguang
中科院分区：
文献类型：
--
作者：
Pahl, Anthony J;Shapley, Alice;Steidel, Charles C;Reddy, Naveen A;Chen, Yuguang
电离光子逃逸分数(Fesc)和恒星形成速率表面密度(Σ)之间的关系是再电离模型的关键输入，但在高红移时仍未得到验证。我们分析了凯克·莱曼连续统调查(KLCS)中的35z∼3星系，覆盖了莱曼连续统(LYC)和高分辨率HST V606成像的深层、静止的远紫外光谱，从而能够估计Fesces和Rest-UV大小。利用Σ图像的S轮廓拟合和多波段光度测量的光谱能量分布，我们测量了样本中星系的有效大小和SFR，并将样本分成两个箱的HST SFR。基于复合光谱，我们估计了两个〈SFR子样本的〉，发现两者的ΣFESC〈〉没有显著差异。为了检验KLCSHST样本的代表性和这一结果的稳健性，我们尝试恢复Fescen和Lyα等价宽度之间的既定相关性。这种相关性在KLCSHST样本中并不显著，表明该样本不足以关联星云和星系属性，如Σ星云。我们使用KLCS父样本进行堆叠模拟，以确定FESC-ΣSFR连接的稳健探测器的最佳样本大小，从而为未来的观测计划提供信息。对于具有独立于电离属性的选择的程序，需要≥90对象；对于优先观察强泄漏的LYC源，需要≥58对象。更广泛地说，测量Σ和ΣSFR之间的联系需要一个更大、更具代表性的样本，横跨星系属性的广泛动态范围，如Fescs SFR。
The connection between the escape fraction of ionizing photons (fesc) and star formation rate surface density (ΣSFR) is a key input for reionization models, but remains untested at high redshift. We analyse 35z∼ 3 galaxies from the Keck Lyman Continuum Survey (KLCS) covered by deep, rest far-UV spectra of the Lyman continuum (LyC) and high-resolutionHST V606imaging, enabling estimates of bothfescand rest-UV sizes. Using Sérsic profile fits toHSTimages and spectral-energy distribution fits to multiband photometry, we measure effective sizes and SFRs for the galaxies in our sample, and separate the sample into two bins of ΣSFR. Based on composite spectra, we estimate 〈fesc〉 for both ΣSFRsubsamples, finding no significant difference in 〈fesc〉 between the two. To test the representativeness of the KLCSHSTsample and robustness of this result, we attempt to recover the well-established correlation betweenfescand Lyα equivalent width. This correlation is not significant within the KLCSHSTsample, indicating that the sample is insufficient for correlatingfescand galaxy properties such as ΣSFR. We perform stacking simulations using the KLCS parent sample to determine the optimal sample size for robust probes of thefesc-ΣSFRconnection to inform future observing programs. For a program with a selection independent of ionizing properties, ≥90 objects are required; for one preferentially observing strongly-leaking LyC sources, ≥58 objects are required. More generally, measuring the connection betweenfescand ΣSFRrequires a larger, representative sample spanning a wide dynamic range in galaxies properties such as ΣSFR.
DOI：
10.3847/1538-3881/ab63d5/data
发表时间：
2020-02
期刊：
--
影响因子：
--
作者：
Y. Zou;Fuxiang Liu;Bin Liao;Yu Liu;Yating Chai;Lei Xia
通讯作者：
Y. Zou;Fuxiang Liu;Bin Liao;Yu Liu;Yating Chai;Lei Xia