论文标题
silverrush ly $α$发射器候选人的lofar属性在Elais-N1领域
LOFAR properties of SILVERRUSH Ly$α$ emitter candidates in the ELAIS-N1 field
论文作者
论文摘要
Lyman Alpha发射器（LAES）在电离时期（EOR）（EOR）提供了早期星系进化的有价值的探针和电离的过程。但是，它们丰富的确切演变和排放的性质仍然是悬而未决的问题。我们将229和349个LAE候选者的样本与$ z = 5.7 $和$ z = 6.6 $组合在一起，分别来自Silverrush窄带调查，其中具有深层低频阵列（Lofar）无线电连续性观测，以搜索EOR中的eor射电量，并研究了$ z \ g的低率无线电属性。我们的Lofar观测值达到了150MHz的$ \ sim20 \，μ$ jy beam $^{ - 1} $的前所未有的噪声水平，我们以$>5σ$的意义检测到五个候选Laes。基于独立多波长观测值的详细光谱能量分布建模，我们得出结论，这些来源可能是$ z = 1.47 $的[OII]发射器，不会产生可靠的$ z \ gtrsim5.7 $射电星系候选者。我们检查了111美元$ z = 5.7 $和$ z = 6.6 $ lae候选者的lae候选者未被Lofar检测到，发现$ Z = 5.7 $和$ Z = 6.6 $的LAE候选样品子集的污染率为81-92％。该子集偏向更明亮的幅度和红色的近红外颜色。因此，完整样品的污染率可能低于报告的值。通过对近红外颜色的限制来显着降低污染，这突出了对红外观测的需求，以在窄带调查中稳健地识别明亮的LAE。最后，对可靠的LAE样品的无线电连续观测堆叠产生2 $σ$的无线电发光度上限为8.2 $ \ times $ 10 $^{23} $和8.7 $ \ times $ 10 $^{23} $^{23} $ w hz $^hz $^{ - 1} $在$ z = 5.7 $和$ 6.6 $中，相应地相应地在$ 6.6 $中，相应地相应地率。 $ <$ 53和$ <$ 56 m $ _ {\ odot} $ yr $^{ - 1} $。
Lyman alpha emitters (LAEs) in the Epoch of Reionization (EoR) offer valuable probes of early galaxy evolution and the process of reionization; however, the exact evolution of their abundance and the nature of their emission remain open questions. We combine samples of 229 and 349 LAE candidates at $z=5.7$ and $z=6.6,$ respectively, from the SILVERRUSH narrowband survey with deep Low Frequency Array (LOFAR) radio continuum observations in the ELAIS-N1 field to search for radio galaxies in the EoR and study the low-frequency radio properties of $z\gtrsim5.7$ LAE emitters. Our LOFAR observations reach an unprecedented noise level of $\sim20\,μ$Jy beam$^{-1}$ at 150MHz, and we detect five candidate LAEs at $>5σ$ significance. Based on detailed spectral energy distribution modelling of independent multi-wavelength observations, we conclude that these sources are likely [OII] emitters at $z=1.47$, yielding no reliable $z\gtrsim5.7$ radio galaxy candidates. We examine the 111 $z=5.7$ and $z=6.6$ LAE candidates from our panchromatic photometry catalogue that are undetected by LOFAR, finding contamination rates of 81-92% for the $z=5.7$ and $z=6.6$ subset of the LAE candidate samples. This subset is biased towards brighter magnitudes and redder near-infrared colours. The contamination rates of the full sample will therefore likely be lower than the reported values. Contamination is lowered significantly through constraints on the near-infrared colours, highlighting the need for infrared observations to robustly identify bright LAEs in narrowband surveys. Finally, the stacking of radio continuum observations for the robust LAE samples yields 2$σ$ upper limits on radio luminosity of 8.2$\times$10$^{23}$ and 8.7$\times$10$^{23}$ W Hz$^{-1}$ at $z=5.7$ and $6.6$, respectively, corresponding to limits on their median star-formation rates of $<$53 and $<$56 M$_{\odot}$ yr$^{-1}$.
